Fish farming method implemented within an annular basin comprising movable and removable transverse grids, and corresponding installation

Abstract

The present invention relates to a fish farming method implemented in a fish farming installation comprising at least one annular tank (12), the method comprising the following steps: insertion of at least two vertical, horizontally movable, and removable transverse grids (13) into the annular tank, defining a section of said annular tank; transfer of a batch of fish into said section; translation of said at least two grids (13) within the annular tank (12) during the growth and / or maturation of said batch of fish within said section; removal of at least one of said at least two grids (13) after transfer of the batch of mature fish to the outside of said annular tank (12). Figure 8

Description

Title of the invention: Fish farming method implemented within an annular tank comprising movable and removable transverse grids, and corresponding installation. Technical field

[0001] The field of the invention is that of off-site fish farming processes. The installations implemented in such off-site processes are built on land and not in a marine, riverine, lake, or pond environment.

[0002] More specifically, the invention relates to a fish farming method employing at least one annular tank through which a flow of water circulates, intended to house fish for their development. Furthermore, the invention also relates to a fish farming installation employing such a method. Previous art

[0003] In fish farming, fish welfare is a major concern when designing fish farming ponds. Indeed, fish raised in good conditions will be of better quality in terms of weight and taste.

[0004] A stressful but necessary step today is the transfer of a batch of fish from one tank to another in order to weigh them, count them, and remove dead fish. The number of transfers during the fish's lifetime is determined by the size of the tanks, their number, and biosecurity rules, which notably prohibit mixing batches of fish to meet traceability requirements in fish farming.

[0005] In “classical” systems which include a large plurality of basins, the transfer frequently occurs, by fish pump or by net.

[0006] In the most recent version of the rearing tanks, these are equipped with permeable walls or grids, defining several sections. Transfer can be carried out by passing through openings (or hatches) in the grids separating the different groups of fish (ref. EP2996465, WO2019 / 199176). However, such transfers remain stressful for the fish. In addition, these hatches increase the overall cost of the grids. Furthermore, these grids are dedicated to a specific fish species due to the fixed bar spacing. Therefore, raising a different fish species than the one planned in the design requires replacing all the grids.

[0007] Another way of transferring the fish is to reduce their living space by gradually removing water from the pond in order to catch them more easily, for example with a net: this is the most stressful method of transfer.

[0008] The more stress a fish experiences, the longer the recovery time and the greater the loss of production. Furthermore, stress can also cause health risks: fish weaken due to a lack of food intake, may become ill, or even die.

[0009] Another issue is the cleaning of the walls and grates and the time spent on this task, which is necessary in addition to the self-cleaning effect generated by the water flow. Indeed, in conventional systems (numerous small basins in series and / or parallel), this cleaning is done manually using a brush or similar tool. It takes place two to three times a week per basin. During this time, the basin is unavailable. The financial impact is twofold, affecting both the initial investment and the operating costs. Less frequently, it may be necessary to empty the basin for cleaning. In this case, another basin is required to ensure continuous production. Finally, large installations can be equipped with cleaning robots, which are expensive and of limited effectiveness. Objectives of the invention

[0010] The objective of the invention is to propose a fish farming process that enhances the prior advantages and overcomes at least some of the disadvantages described above of prior art processes.

[0011] Thus, one objective of the invention is to limit the handling of fish within annular tanks.

[0012] Indeed, the process according to the invention aims to improve the welfare of the fish by limiting their stress, in order to obtain a relatively regular weight curve, and good quality of the finished product.

[0013] Furthermore, another objective of the invention is to simplify the fish farming process as a whole, by simplifying the implementation of the installation, its cleaning and the handling of batches of fish.

[0014] The invention also aims to provide an evolving, economical and compact fish farming process, adaptable to different uses.

[0015] Finally, another objective of the invention is to provide an installation for implementing such a process. Presentation of the invention

[0016] These objectives, as well as others that will appear subsequently, are achieved using a fish farming process implemented within a fish farming facility comprising at least one annular tank. The process comprises the following steps: - insertion of at least two transverse grids, essentially vertical, movable in horizontal translation and removable, into the annular tank, defining a section of said annular tank; - transfer of a batch of fish into the said section; - translation, in the annular basin, of the said at least two grids, during the growth and / or maturation of the said batch of fish within the said section; - removal of at least one of the said at least two grids, after transfer of the batch of fish at the end of a growth cycle to the outside of said annular basin.

[0017] Thus, the process according to the invention makes it possible to limit stress on the fish by limiting transfers, in particular transfers between sections. As a result, animal welfare is improved, fish growth is optimized, and the quality of the finished product is enhanced.

[0018] In addition, removing the grids at the end of the route makes it easier to clean them, maintain them or replace them if necessary.

[0019] Finally, the management of fish batches is facilitated since each batch of fish is delimited by two transverse grids, known as sectioning grids, during a growth / maturation cycle. The translation of the grids thus allows for simple and rapid management of the different batches of fish within an annular tank, from the fish entry zone to the exit zone of the annular growth / maturation tank.

[0020] By "essentially vertical", it is meant that the grid has an angle between 0 and 45° with respect to the vertical.

[0021] By "growth cycle" is meant a complete cycle within an annular tank, during which the batch of fish has reached an adult or intermediate size.

[0022] According to a preferred embodiment of the invention, the removal of at least one of said at least two grids includes a disassembly of at least two horizontal panels constituting at least in part said at least one of said at least two grids.

[0023] Thus, the removal of a grid is facilitated. Indeed, the grid can be modular and can therefore include a back panel and a top panel, possibly with one or more intermediate panels. Since these panels are removable, grid removal is easier and the lifting height is reduced, resulting in lower construction costs and easier handling.

[0024] Advantageously, subsequent to the removal of at least one of said at least two grids, the process includes cleaning said at least one of said at least two grids.

[0025] Thus, each removed grid can be cleaned so that it is operational for insertion back into an annular basin. Thus, the cleaned grids can be placed directly at the head of the course in the annular basin in the fish entry zone.

[0026] Preferably, said batch of fish remains in said section during said growth cycle.

[0027] Thus, this optimizes fish growth by improving animal welfare and limiting transfers between sections via hatches, for example. Finally, the absence of hatches within the grids reduces the cost of these grids.

[0028] Preferably, the process includes a continuous water treatment and recirculation step, implemented by water treatment means, and by at least one recirculation means.

[0029] Thus, the continuous treatment and recirculation of water makes it possible to limit the water consumption of the installation, and to operate almost or totally in a closed loop, by treating almost all of the water and recirculating it in the fish farming ponds (pre-fattening and / or growth / maturation).

[0030] Moreover, such a treatment step carried out within the installation allows for more suitable and optimized management of water treatment for fish farming.

[0031] Finally, such a water treatment step makes it possible to maintain a constant water quality throughout the pre-growing and growth / maturation cycles, using optimized water treatment means.

[0032] According to an advantageous variant, the section of said annular basin defined by said at least two grids is of variable size, the distance between said at least two grids being able to vary according to the size and species of the fish of said batch.

[0033] Thus, the mobility of the grids and the variability of the size of a section allow for simplified and optimized management of the different batches of fish. Each section can therefore be adapted as needed to the species, size, and development of the fish.

[0034] Advantageously, the method includes a step of configuring said at least two transverse grids, these comprising bars whose section and spacing are adapted to the size and species of the batch of fish.

[0035] Thus, the configuration of the grids allows them to be adapted to any type of fish, and to any desired application, while optimizing the pressure losses due to the grids.

[0036] Thus, such a process can be used for many different species of fish.

[0037] Preferably, and said configuration step of said at least two transverse grids includes a spacing step of said bars of said grids allowing, for each grid, to adjust the spacing between the bars of the latter so that its bars are spaced apart from each other according to a predetermined distance, between 5 and 60 mm.

[0038] According to an advantageous embodiment of the invention, the step of spacing said bars of said at least two transverse grids includes fixing at least one rack on said bars, said at least one rack being placed perpendicular to said bars and having indentations to accommodate said bars.

[0039] Thus, such a rack makes it possible to maintain a given spacing between the bars of a panel of a transverse grid. It is also designed to accommodate bars of different cross-sections. Furthermore, a first rack can be replaced by a second rack (with a different indentation) in order to modify the bar spacing and accommodate bars whose cross-section has changed. Therefore, the transverse grids are adaptable to a wide variety of fish species, as well as to fish of the same species but at different stages of development and of different sizes. Moreover, optimizing the bar spacing helps to limit pressure losses. In particular, these concentration devices are optimized using at least one rack to achieve a void ratio of at least 50%.

[0040] According to a variant of the invention, the method comprises a sequential step of cleaning said at least one annular basin, using cleaning means positioned in the lower part and / or on each side of said at least two grids.

[0041] Thus, such a sequential cleaning step ensures optimal performance of the installation, while also promoting the maintenance of consistent water quality. Indeed, these cleaning methods keep the annular basin clean by removing any biological deposits on the walls and / or bottom.

[0042] According to an advantageous embodiment, the process includes a preliminary pre-enlarging step comprising the following steps: - introduction of a batch of young fish into a pre-growing tank; - pre-growing phase of young fish in said pre-growing tank, within which a water flow is generated;

[0043] - the step of transferring the batch of fish into said section of the annular tank taking place from the pre-growing basin; the flow velocity of the water flow within the annular basin being greater than the flow velocity of the water flow within the pre-growing basin.

[0044] Thus, the present invention incorporates a pre-growing stage adapted to young fish leaving quarantine. This stage optimizes fish growth by improving animal welfare and limiting stress through the distribution of water current speeds, which is adapted to the size of the different fish and is therefore closer to natural conditions.

[0045] Advantageously, the pre-enlargement basin is placed in the center of said at least one annular basin, said pre-enlargement basin being called the central basin.

[0046] Thus, the method and installation according to the invention are optimized and more advantageous, particularly for small to medium-sized fish farms. Using the central space as a fish farming tank allows for a similar water level between the different tanks, thereby reducing mechanical stress on the walls and facilitating flow management with a single pumping unit. Consequently, with such a central space, the piping is reduced and simplified. As a result, manufacturing costs and time are reduced. Furthermore, implementation costs are also reduced due to optimized / reduced pressure losses.

[0047] Furthermore, by limiting the distances between fish farming ponds, this installation improves animal welfare by reducing transfers that can be stressful for the fish. This optimizes fish growth.

[0048] Furthermore, by combining such a central basin with one (or more) annular basins, the architecture of the installation is compact and allows for optimization of the network's pressure losses.

[0049] According to one embodiment of the invention, the step of transferring the batch of fish into said section of the annular tank comprises the following steps:

[0050] - concentration of said batch of fish in a part of the pre-growing tank, using mobile means of concentration;

[0051] - opening of a hatch in the wall of the pre-enlargement tank included in the area delimited by the means of concentration, for the transfer of fish to said annular basin.

[0052] Thus, mobile concentration devices simplify and limit the handling of fish, in order to transfer them subsequently to another fish farming tank. The present invention therefore optimizes fish growth while improving animal welfare.

[0053] Furthermore, the use of a trapdoor as a means of transfer between the pre-growing tank and said at least one annular tank also helps to limit the stress on the fish, since no pump is used.

[0054] Advantageously, the process includes a step of configuring said concentration means, these comprising bars whose section and spacing are adapted to the size and species of the batch of fish.

[0055] Thus, the configuration of the grids allows them to be adapted to any type of fish, and to any desired application, while optimizing the pressure losses due to the grids.

[0056] Thus, such a process can be used for many different species of fish.

[0057] Preferably, said configuration step of said concentration means includes a spacing step of said bars of said grids allowing, for each grid, the spacing between the bars of the grid to be adjusted so that its bars are spaced apart from each other according to a predetermined distance, between 5 and 60 mm.

[0058] According to an advantageous embodiment of the invention, the step of spacing said bars of said concentration means includes fixing at least one rack on said bars, said at least one rack being placed perpendicular to said bars and having indentations to accommodate said bars.

[0059] Thus, such a rack makes it possible to maintain a given spacing between the bars of the concentrating means. It is also designed to accommodate bars of different cross-sections. Furthermore, a first rack can be replaced by a second rack (with a different indentation) in order to modify the bar spacing and accommodate bars whose cross-section has changed. Therefore, the concentrating means are adaptable to a wide variety of fish species, as well as to fish of the same species but at different stages of development and of different sizes. Moreover, optimizing the bar spacing helps to limit pressure losses. In particular, these concentrating means are optimized using at least one rack to achieve a void ratio of at least 50%.

[0060] According to another preferred embodiment, the process includes a sequential step of cleaning said pre-enlarging basin, using cleaning means positioned on the concentrating means.

[0061] Thus, such a cleaning step ensures optimal performance of the installation, while also promoting the maintenance of consistent water quality. Indeed, these cleaning methods keep the pre-growing tank clean by removing any biological deposits on the walls and / or bottom of the tank.

[0062] The invention also relates to a fish farming installation for implementing the process as described above, said installation comprising at least one annular basin, said installation being characterized in that said at least one annular basin accommodates at least two essentially vertical transverse grids, movable in horizontal translation, and removable, defining a section of said annular basin, intended for the growth and / or maturation of a batch of fish.

[0063] The mobility of the transverse sectioning grids within the annular tank(s) allows the batches of fish to be moved as needed simply by moving the grids. These grids thus define sections of the annular tank, each section capable of holding a batch of fish. The mobility of these grids also allows the volume of a section to be adapted to the density and size of the fish. of the corresponding batch. Thus, such a configuration helps to limit stress on the fish by minimizing their handling. Indeed, the installation does not require the use of hatches within the vertical transverse grids to transfer fish from one section to another, since the volume of the tank section adapts to the needs of the fish, which reduces the cost of the grids and improves animal welfare.

[0064] In the case of installations of modest size, such grids are easily handled by operators. Thus, these grids can be easily moved manually or by lifting and handling means, but they can also be equipped with automation systems, allowing for simplified handling.

[0065] In addition, since the grids are removable, they can be easily removed from the installation for maintenance and / or cleaning operations, and then reinstalled in the basin, thus ensuring an optimal level of performance of the installation, while promoting the maintenance of a constant water quality.

[0066] The mobility and removability of the grids allow for an adaptable and variable configuration depending on the number of batches, the size of the fish, etc.

[0067] Advantageously, said at least two grids consist of a set of at least two removable panels, the number of panels being able to depend on the height of the basin.

[0068] Thus, since a sectioning grid can be modular with several removable panels, the height required to lift the grids is reduced, which consequently limits the height of the building housing the installation and thus the cost of its civil engineering. The removable nature of the panels also facilitates the installation and removal of these grids.

[0069] According to one embodiment, said at least two panels comprise a back panel and a top panel.

[0070] Thus, a grid is composed of two main horizontal panels, between which one or more intermediate panels can be integrated, depending on the height of the installation. These panels are removable and facilitate the handling of the grids when inserting and removing them from an annular basin.

[0071] Advantageously, said at least two grids comprise bars spaced at a distance imposed by at least one rack, having indentations to accommodate the bars. Preferably, the spacing between these bars is between 5 and 60 mm.

[0072] According to a preferred embodiment, the installation comprises a pre-growing tank, said installation comprising means for generating a flow of water flowing into said at least one annular tank at a velocity V, and means allowing to generate a flow of water flowing into said pre-growing basin at a speed v lower than said speed V.

[0073] Thus, the present invention makes it possible to optimize the growth of fish by improving animal welfare and limiting stress through the distribution of water current speeds which is adapted to the size and growth stage of the different fish, and is therefore closer to natural conditions.

[0074] Preferably, said pre-growing tank is located in a central space of said installation, at the center of said at least one annular tank.

[0075] Indeed, such an installation is simpler than many large prior art fish farming installations and can be built using fewer components. Moreover, some of these components can be supplied in prefabricated form. An installation that is at least partially prefabricated thus reduces the amount of civil engineering work required on site and considerably lowers the construction time and cost.

[0076] Furthermore, by limiting the distances between fish farming ponds, this installation improves animal welfare by reducing transfers that can be stressful for the fish. This optimizes fish growth.

[0077] Furthermore, the present invention makes it possible to optimize fish growth by improving animal welfare and limiting stress through the distribution of water current speeds which is adapted to the size of the different fish, and is therefore closer to natural conditions.

[0078] Thus, the central space is advantageously dedicated to the pre-growing of fish, and preferentially presents a low density of fish adapted to such an application.

[0079] Furthermore, by combining such a central pre-sprouting basin with one (or more) annular basin(s), the architecture of the installation makes it possible to optimize the pressure losses of the network.

[0080] Advantageously, the pre-growing tank includes mobile means for concentrating fish within a part of said pre-growing tank.

[0081] These mobile fish concentration devices thus make it possible to group or concentrate the fish in a section of the pre-growing tank. These mobile concentration devices therefore simplify and reduce the handling of the fish, in order to transfer them subsequently to another fish farming tank. Thus, the present invention optimizes fish growth by improving animal welfare and reducing fish stress.

[0082] Preferably, the mobile concentration means comprise a vertical hinged grid having at least two leaves allowing at least one sector of variable size to be defined within the pre-enlargement basin.

[0083] According to a preferred feature of the invention, the pre-magnification tank is cylindrical, and said hinged grid is pivotally mounted about the axis of said pre-magnification tank, said sector being a circular sector, pivoting at least one of the leaves about said axis changing the size of the sector

[0084] Thus, this grid with at least two vertical leaves allows, by bringing two leaves closer together, the concentration of fish without generating stress, in order to facilitate their subsequent transfer to another fish farming pond.

[0085] In addition, this grid can also be used to define several circular sectors in order to separate different batches of fish in each sector of the pre-growing tank.

[0086] This grid with at least two leaves allows for simplified and optimized handling of fish within the pre-growing tank. Furthermore, such a grid is suitable for small to medium-sized farms, since it can be easily operated by a human operator or automated by motorization.

[0087] Advantageously, the concentration means comprise bars, spaced at a distance imposed by at least one rack having indentations to accommodate the bars. Preferably, the spacing between these bars is between 5 and 60 mm

[0088] According to a preferred embodiment of the invention, the installation includes means for transferring fish from the pre-growing tank to said at least one annular tank.

[0089] According to an advantageous embodiment of the invention, the transfer means comprise at least one hatch in the wall of the (central) pre-growing tank, through which the fish can pass.

[0090] Thus, the use of a trapdoor as a means of transfer between the pre-growing tank and said at least one annular tank, makes it possible to limit the stress of the fish, since no pump is used.

[0091] Moreover, by combining such a trap with fish concentration means, the fish are easily guided towards the trap, without generating stress.

[0092] Finally, the simple operation of such a trap is much less energy-intensive than the implementation of a pumping step, thus allowing a reduction in the implementation costs of the installation.

[0093] According to an advantageous variant, the installation includes means for cleaning the transverse grids.

[0094] These cleaning means make it possible to keep the grids clean by removing biological deposits in order to optimize the passage of water through them.

[0095] According to another advantageous embodiment, said essentially vertical transverse grids of said at least one annular basin and / or said mobile means of concentration of the pre-growing tank include means for cleaning, respectively, said at least one annular tank and / or said pre-growing tank.

[0096] Thus, such a cleaning step, carried out during the movement of the grids, ensures optimal performance of the installation while promoting the maintenance of consistent water quality. Indeed, these cleaning methods keep the annular tank and the pre-growing tank clean by removing any biological deposits on the walls and / or bottom of the fish farming tanks.

[0097] According to one variant of the invention, the installation includes water treatment means contiguous to said at least one annular basin.

[0098] The invention thus makes it possible to maintain a constant water quality, using optimized water treatment means. Furthermore, with water treatment means located outside the aquaculture zone, operating flows and costs are optimized.

[0099] Furthermore, the proximity of the treatment facilities to the fish farming ponds makes it possible to reduce the length of the water pipes and the size of the installation.

[0100] According to another variant of the invention, the installation includes water treatment means located away from said at least one annular basin.

[0101] Thus, by positioning the water treatment facilities away from the fish farming ponds, the layout and footprint of the installation can be optimized. Indeed, the water treatment stages can, for example, be aligned along a building to facilitate waste removal and reduce the need for ventilation ducts. Furthermore, this allows for greater flexibility in the placement of the water treatment equipment, and it is possible to share these treatment processes for several fish farming ponds.

[0102] According to yet another variant of the invention, the installation includes water treatment means, positioned in the center of said at least one annular basin.

[0103] Thus, the installation is compact and directly integrates the treatment means as close as possible to the annular basins. Presentation of the figures

[0104] Other features and advantages of the invention will become more apparent upon reading the following description of a preferred embodiment, given by way of simple illustrative and non-limiting example and described with reference to the following drawing:

[0105] Fig. 1 represents a 3D view of fish farming ponds according to an example of an embodiment of the invention.

[0106] Fig. 2 represents a fish farming installation comprising fish farming ponds and means for treating water internal to the central space, according to an example of an embodiment.

[0107] Fig. 3 represents a fish farming installation comprising fish farming ponds and external water treatment means, according to an example of an embodiment.

[0108] Fig. 4 represents a fish farming installation comprising fish farming ponds and external water treatment means, according to another embodiment.

[0109] Fig. 5 represents fish concentration means implemented in the pre-growing tank, according to an example of an embodiment.

[0110] Fig. 6 represents fish concentration means implemented in the pre-growing tank, as well as means for transferring fish to the outside of the central pre-growing tank, according to an example of an embodiment.

[0111] Fig. 7 represents means of concentrating fish, according to another embodiment.

[0112] Fig. 8 represents an annular basin grid, according to an example of an embodiment.

[0113] Figure 9 shows an exploded view of an annular basin grid, according to a example of a project.

[0114] Fig. 10 represents cleaning means, according to an example of an embodiment.

[0115] Figure 11 represents means for spacing the bars of a grid, according to a example of a project.

[0116] Fig. 12 represents means of spacing the bars of a grid, according to a complement to the previous embodiment example. Detailed description of the invention 1. General Description

[0117] The present invention relates to a fish farming method employing one or more annular tanks in which growth sections of batches of fish are defined using sliding and removable grids.

[0118] In relation to [Fig. 1], an example of a fish farming tank configuration is presented. Thus, the installation according to [Fig. 1] comprises a central cylindrical space (11) and two annular tanks (12) surrounding the central space (11). The annular tanks are divided into several sections by means of vertical or inclined sectioning grids (13) at an angle of 0 to 45° to the vertical, positioned across the flow at an angle of between 45 and 90° to the water flow. These grids thus allow the separation of the different batches of fish, exhibiting for example different stages of growth / maturation.

[0119] According to an example embodiment, all the basins have the same water flow velocity.

[0120] According to another preferred embodiment, the water circulation velocity in each annular basin (12) is individually independent. Thus, each annular basin can have a water circulation flow adapted to different batches of fish. According to the invention, the velocity of the water flow in the annular basin(s), denoted Vb ... VN, can be adapted to the different growth stages of the fish, or even possibly to the different species present in each of the annular basins.

[0121] The installation thus makes it possible to improve animal welfare by reproducing conditions that more closely resemble natural conditions. The water circulation flow or the water velocity within each basin can be controlled and adjusted preferably using at least one internal variable-speed circulator or pump.

[0122] Furthermore, the use of movable and removable sectioning grids (13) simplifies and reduces the handling of batches of fish. For example, two identical grids can follow the same batch of fish throughout its growth. This minimizes animal stress by reducing handling.

[0123] Furthermore, according to a preferred embodiment, in order to implement a continuous water treatment and recirculation step, each tank is equipped with at least one water inlet and at least one water outlet or an outlet common to all the tanks (25), as illustrated in the examples in [Fig. 3] and [Fig. 4]. Thus, at the outlet of the fish farming tanks, the water is treated before being reinjected at the tank inlet. The water flow within the tanks is thus generated using one or more pumping systems connected to the water treatment means. Moreover, this water treatment step can be carried out either by treatment means within the central space or by external water treatment means.

[0124] The process and installation according to the invention are preferably intended for small to medium-sized farms. This makes it possible to re-establish short supply chains, with a greater number of small installations distributed as close as possible to consumption areas in order to minimize environmental impact and transport costs.

[0125] To meet the constraints associated with small-scale operations, the installation can be built at least partially from prefabricated elements. According to a particular configuration of the invention, the use of the central space as The fish farming basin reduces the mechanical stresses applied to the wall between the central area and the first annular basin due to the similar water levels. Furthermore, this configuration simplifies flow management. Mechanical stresses are also reduced between the annular basins.

[0126] Thus, the use of prefabricated materials such as metal, wood, concrete, organic resin-reinforced fiberglass panels or any other material that can be prefabricated avoids civil engineering work on site and considerably reduces construction time.

[0127] The process according to the invention thus allows for the implementation of a compact and economical installation. This process is quick and easy to implement. Furthermore, the installation is also quick, simple, and inexpensive to set up. Finally, the fish farming process according to the invention improves animal welfare, thereby optimizing fish growth and improving the quality of the finished product.

[0128] More specifically, the invention proposes the implementation of a fish farming process comprising the following steps, defining a growth / maturation cycle for a batch of fish: - insertion of at least two essentially vertical, movable, translationally removable transverse grids in an annular growth / maturation basin, the grids defining a section of the annular basin; - transfer of a batch of fish into the section; - translation, in the annular basin, of the grids, during the growth and / or maturation of the batch of fish; - removal of at least one of the grids, after transfer of the batch of fish at the end of a growth cycle to the outside of the annular basin; - Optional cleaning of the removed grille.

[0129] The grid thus cleaned can then be reused for a new growth / maturation cycle within an annular basin. 2. Fish pre-fattening stage

[0130] The pre-growing stage allows young fish to reach a sufficient size to enter the annular growth / maturation tanks, where the water flow velocity, denoted V, is relatively high. Indeed, the water flow velocity during the pre-growing stage, denoted v, is preferentially low, to be suitable for small young fish, and thus allow them to begin their development in an optimal environment. Therefore, the velocity v within the pre-growing tank is lower than the velocity V within the growth / maturation tank. Furthermore, for these same reasons, the pre-growing tank preferentially has a low fish density suitable for the pre-growing stage.

[0131] According to a first configuration illustrated in [Fig. 2], the pre-enlargement stage can be carried out in an external basin (30) to the annular basins (this external basin may be separate from or adjacent to at least one annular basin). Thus, the water treatment stage can be carried out by treatment means (20) located in the central space (11), the use of the central space as a water treatment area, making it possible to gain compactness and limit the distances traveled by the water within the installation.

[0132] According to a second configuration illustrated by [Fig. 3] and [Fig. 4], the pre-growing stage can be carried out in a rearing tank located in the central space (11). Thus, using the central space as a rearing tank, according to this second configuration, also allows for increased compactness and enables optimized transfers from the central pre-growing tank to any section of the adjacent annular growth / maturation tank without any pumping device. Animal stress can therefore be limited, allowing for optimized fish growth. Indeed, given the contiguity of these tanks, one or more hatches can be easily installed in the shared wall. Moreover, with such a central pre-growing tank, the piping is reduced and simplified. Consequently, manufacturing costs and time are reduced.Furthermore, by combining such a central basin with one (or more) annular basins, the installation's architecture optimizes network pressure losses. This reduces the implementation costs of such a process and installation.

[0133] According to a third configuration, the pre-growing stage can be carried out entirely or partially in all or part of an annular tank. The water flow velocity in this pre-growing annular tank is lower than in the growth / maturation annular tanks. Thus, if the central space is not used for a pre-growing stage, the water treatment stage can be carried out by treatment means (20) located in the central space (11). Using the central space as a water treatment area allows for greater compactness and reduces the distances traveled by the water within the installation.

[0134] According to these three configurations, a water flow is generated in the pre-growing tank by an external pumping loop and / or an internal circulator. Indeed, the water current and fish density are moderated within this pre-growing tank, in order to be suitable for young fish coming out of quarantine.

[0135] 2.1. Fish concentration stage

[0136] The pre-growing stage may include a fish concentration stage in a part of the pre-growing tank, the latter therefore including means for concentrating fish.

[0137] In relation to the first and second configurations, described above, [Fig.5], [Fig.6] and [Fig.7] illustrate examples of concentration means that can be implemented within a pre-growing basin according to these configurations.

[0138] Thus, as illustrated by [Fig.5] and [Fig.6], the fish concentration means (14) can take the form of grid(s) comprising two leaves (141, 142). According to this example, each leaf is composed of a frame / chassis (41) and a set of bars / rods (42) held on the frame / chassis.

[0139] The leaves can be movable, for example, rotating around the axis of the central space (11) in the case of a cylindrical pre-magnification tank, this rotation being enabled by a roller (45), a bearing (49) and a handle (44). The leaves, according to this example, can thus define two circular sectors of varying sizes within the pre-magnification tank.

[0140] More specifically, according to the example illustrated in [Fig. 5] and [Fig. 6], the concentrating means (14) may comprise a movable gate (141) and a fixed gate (142), attached to an axis (46). In this example, the axis (46) corresponds to the axis of the cylindrical pre-magnification tank. The fixed gate is therefore attached to the wall of the pre-magnification tank at one end and to the central axis at the other end. The movable gate, for its part, rotates around the central axis by means of an above-water bearing (49) and, at the other end, equipped with a roller (45), it rests either on the top of the wall of the pre-magnification tank or on a peripheral track (47) running around the central pre-magnification tank.

[0141] The movable leaf can be motorized or operated manually by an operator using a handle (44).

[0142] Thus, this grid with two vertical leaves allows, by bringing them closer together, the concentration of fish without generating stress, in order to facilitate their subsequent transfer to another fish farming tank. This two-leaf grid allows for simplified and optimized handling of fish within the pre-growing tank. Furthermore, such a grid is suitable for small to medium-sized farms, since it can be easily operated by a human operator or automated by motorization.

[0143] According to one embodiment, during the fish's stay in the pre-growing tank until the time of transfer, the movable gate is in the "garage" position, then, during the transfer phase, the movable gate is brought closer to the fixed gate.

[0144] In addition, it is possible to install an internal variable speed circulator between the two leaves in order to make the fish swim and thus improve the quality of the finished product.

[0145] According to an alternative embodiment, a grid may have more than two movable and / or fixed vertical leaves (or vertical panels) rotating around a central axis, in the center of the pre-enlargement tank.

[0146] Thus, the use of several gates within the pre-growing tank can also allow for the separation of several batches of fish into different circular sectors. The rotation of the gates allows for easy handling of each batch while minimizing animal stress.

[0147] In addition, in order to prevent the passage of fish from one circular section to another within the pre-growing tank, flaps (or seals) (43) can be integrated into the frame (41) (or chassis) of the movable door (141).

[0148] Each vertical grid leaf can be removed independently for washing or to adapt the configuration of the pre-growing tank to the number of batches of fish.

[0149] The movable leaf may also have means for oxygenating the water or injecting food supplements such as gas injection / distribution pipes (48).

[0150] As illustrated by [Fig.7], the fish concentration means (14) can also take the form of a grid or a horizontal net moving in vertical translation, allowing the fish to be concentrated in the upper or lower section of the pre-growing tank.

[0151] The concentrating means (14) can also be removable to facilitate their cleaning and maintenance.

[0152] Concentration devices incorporating grids are preferably equipped with bars whose cross-section and spacing are designed to prevent fish from passing through the grid while maintaining a high void ratio to limit the pressure drop generated by the circulation of the fish swimming water. The spacing depends on the size and species of the fish. It is preferably between 5 and 60 mm. The void ratio will be as high as possible to limit the energy consumption of the installation and preferably greater than 50%, the void ratio being defined as the proportion of the space between the bars relative to the overall surface area of ​​a grid, this space being free of bars and thus allowing the free flow of water. The grid bars will advantageously be free of sharp edges so as not to injure the fish. Their cross-section can be selected according to the requirements.Concentration methods in the form of hinged grids are therefore modular and can be adapted to a change of use (change of species or size of fish).

[0153] According to one embodiment, the method includes a step of configuring the concentrating means, during which the spacing of the bars can be modified. For example, this spacing can be managed by one or more racks, allowing the spacing to be modified by replacing the rack. An example of a rack is illustrated in [Fig. 11] and [Fig. 12], in which the rack (17) consists of two parts, each with indentations of a defined size, preferably spaced regularly, thus defining the spacing of the bars (16) of the grid. Each part of the rack is elongated and has a U-shaped cross-section, with the indentations located at the ends of each arm of the U. The bars are therefore placed in the indentations of the first rack part, and the second rack part can be added on top of the first part, above the bars, to space them at a regular distance and maintain the bars. The bar section can be modified using a rack with compatible indentations.The concentration methods are therefore modular and can be adapted to a change in use (change of species or size of fish).

[0154] The grids obtained using the racks are illustrated by the example in [Fig. 5], where racks (17) are used to maintain the spacing between each bar of the bar assembly (42). These racks are placed perpendicular to the bars and are arranged at essentially regular intervals in order to maintain the spacing of the bars over their entire height.

[0155] Advantageously, the leaves may include supports to facilitate the attachment of flexible hoses.

[0156] Where the concentrating means are removable, they can be removed manually or with a lifting system. When using a monorail, or more generally a lifting system, a spreader beam can be used to remove the removable concentrating means. In this case, these removable concentrating means are equipped with lifting rings.

[0157] Furthermore, regarding the means of concentration that can be used in the third configuration described above, with pre-enlargement in a section of an annular basin, these can, for example, take the form of the sectioning grids described later in relation to the growth / maturation stage in the annular basins.

[0158] 2.2. Fish transfer step

[0159] Advantageously, the pre-growing stage may also include a fish transfer stage using transfer means, for example, to the nearest annular grow-out / maturation tank. Thus, according to the first configuration, with the pre-growing tank external, these transfer means may take the form of a pump, a net, or any other capture and transfer means, while according to the second and third configurations, these The means preferentially take the form of a trapdoor in the wall of the pre-growing tank, allowing the fish to pass through to an adjacent annular growth / maturation tank.

[0160] Thus, according to the second configuration, illustrated in [Fig. 6], the transfer means (51, 52, 53) can take the form of a trapdoor in the wall of the central pre-growing tank, allowing the fish concentrated in the section of the central pre-growing tank in which the trapdoor is located to pass through the wall into an annular tank. The trapdoor illustrated in [Fig. 6] comprises a generally vertical rectangular opening (51) and a sliding door (52) within a track (53), this door being operable manually or motorized. Thus, the use of a trapdoor as a transfer means between the central pre-growing tank and the adjacent annular tank limits stress to the fish, since no pump is used. Furthermore, by combining such a trapdoor with the fish concentration means, the fish are easily guided towards the trapdoor without generating stress.Finally, simply operating such a hatch is much less energy-intensive than implementing a pumping step, thus reducing the installation implementation costs.

[0161] The representation of the fixed leaf (142) is simplified in the figure to allow illustration of the hatch; it will be understood that this fixed leaf includes bars over its entire surface.

[0162] Furthermore, the transfer means can also take the form of a fish pump or a landing net if the fish need to be sorted, for example.

[0163] In addition, alternative or complementary means can be used to transfer the fish. For example, food or pheromones can be used to attract the fish, or waves, ultrasound, or a heating element can be used to direct them to the desired area.

[0164] Finally, according to the third configuration, the transfer means can, for example, take the form of a trapdoor as described above, in one of the walls of the pre-growing annular tank, allowing the transfer of a batch of fish to an adjacent growth / maturation annular tank.

[0165] 2.3. Maintenance and cleaning stage of the pre-growing tank

[0166] Finally, the pre-growing stage may include a maintenance and / or cleaning stage for the pre-growing tank. This stage may be performed manually at intervals, using means known to those skilled in the art, or it may be performed sequentially by systems mounted on the concentrating means. According to embodiments illustrated in [Fig. 5], [Fig. 6], [Fig. 8], and [Fig. 9], the concentrating means may include means for cleaning the pre-growing tank. According to this example, the cleaning of the tank Pre-growing is carried out sequentially during the movement of the movable gate(s) (141) according to the first and second configurations, or of the sectioning grid (13) according to the third configuration. These concentration means may include washing / cleaning means to remove any biofilm that may have accumulated on the walls and / or bottom of the pre-growing tank during the fish farming process. Thus, the frame (41) of the movable gate (141) or the frame (31) of the sectioning grid (13) may include cleaning means, among which:

[0167] - the mud flaps / seals (33, 43) described above, with or without a return system, They also allow for scraping the walls of the annular basin and removing any biofilm; and / or

[0168] - manual or motorized rotary brushes, positioned vertically to clean one of the pool walls, and / or positioned horizontally to clean the pool floor (or slab); and / or

[0169] - one or more pressurized water nozzle ramp(s).

[0170] It is also possible to implement a leaf or a grille of a sectioning system specifically designed for cleaning, consisting of a frame without bars and cleaning means as described above. Figure 10 illustrates, for example, a frame with vertical rotating brushes (15) for cleaning the walls of an annular basin.

[0171] Furthermore, the process and installation according to the invention implement means for cleaning the concentration means, enabling them to be kept clean, by eliminating biological deposits in order to optimize the passage of water through them. 3. Fish growth / maturation stage

[0172] The fish growth and / or maturation stage takes place in one or more annular tanks arranged around the central area. This (or these) annular tank(s) is / are equipped with sectioning grids and flow devices to generate a water velocity within the annular channel. The growth / maturation stage is the stage during which the fish, preferably pre-grown during the pre-growing stage, reaches a mature size and age and is ready for consumption. A growth / maturation stage may include several growth cycles within several annular tanks.

[0173] 3.1. Grid insertion step

[0174] The fish growth and / or maturation stage includes a step of inserting sectioning grids into the annular growth / maturation basin, defining sections of the annular growth / maturation basin.

[0175] Thus, each annular tank is equipped with at least one essentially vertical transverse grid (or sectioning grid). These sectioning grids are essentially perpendicular to the water flow and allow the separation of the different groups of fish present in the same annular tank. Therefore, the number of sectioning grids depends on the number of groups of fish in the annular tank. These grids are movable in translation and removable, either manually or automatically.

[0176] Furthermore, as illustrated by the example of [Fig.8] and [Fig.9], said transverse grids can consist of a set of at least two removable panels (131, 132), the number of panels being a function of the height of the basin.

[0177] A sectioning grid can therefore include a bottom panel (131), and a top panel (132), with optionally one or more intermediate panels (133).

[0178] According to such a preferred feature, the height required to raise the grilles can be reduced, which, consequently, makes it possible to limit the height of the building housing the installation and thus the cost of its civil engineering. The demountable nature of the panels also facilitates the removal and installation of these grilles (131, 132, 133).

[0179] The insertion of the sectioning grid (13) can be carried out in several steps comprising the assembly of at least two horizontal panels. According to the example illustrated by [Fig.8] and [Fig.9], first, the bottom panel (131) is placed in the annular basin, then the optional intermediate panel (133) is assembled to the lower panel, and finally, the upper panel (132) is assembled to the intermediate panel.

[0180] Furthermore, as illustrated by the example in [Fig. 8] and [Fig. 9], one or more gas injection pipes, possibly with quick-connect fittings (compressed air, etc.) (38), can be added to the lower part of the grids to lift dead fish. Other injection pipes (for gas or specific liquids such as oxygen, feed supplements, etc.) can be added, preferably to the lower part or to any other level of the grids, to oxygenate the pond water, feed the fish, etc., either occasionally or continuously.

[0181] 3.2. Fish transfer step

[0182] The fish growth and / or maturation stage also includes a fish transfer stage within a section defined by two sectioning grids in an annular growth / maturation tank. Thus, in channel-shaped annular tanks, a batch of fish is delimited by a set of two sectioning grids. As described previously, the transfer of fish within a section of an annular growth / maturation tank can be carried out by pumping, with a net, or via other means of transfer, preferably through an opening or a hatch between the pre-growing tank or between two annular tanks.

[0183] 3.3. Grid translation step

[0184] The fish growth and / or maturation stage also includes a step involving the translation of the sectioning grids within an annular growth / maturation tank. Indeed, the movement of the sectioning grids is similar to a translation at the scale of the channel formed by the annular tank in which they are located. However, in a particular example where the central space is cylindrical and the annular tanks are concentric around the axis of the central space, the movement of the grids within the annular tank is more akin to a rotational movement around the axis of the central space, at the scale of the installation.

[0185] During this translation step, the mobility of the grids allows the batches of fish to be moved from the fish entry zone in the annular growth / maturation tank to the fish exit zone of this tank, simply by moving the grids. This also allows the volume of a section, defined between two consecutive movable grids, to be adapted to the density and size of the fish in the corresponding batch. Thus, such a configuration makes it possible to limit stress on the fish by minimizing their handling, as the fish are kept between the two grids. Indeed, the fish farming process according to the invention does not require the use of hatches within the sectioning grids to transfer the fish from one section to another, which reduces the cost of the grids and improves animal welfare.

[0186] Furthermore, to prevent mixing between different batches of growing / maturing fish, the grids can be fitted with rubber seals / flaps (33) to prevent fish from passing around or under the grids. The rubber flaps may have a return mechanism and are positioned on the lateral sides as well as on the lower part of the grid frames to fill the gaps with the lateral surfaces and the bottom of the fish farming tanks.

[0187] These flaps also allow the grids to be positioned across the flow at an angle between 45 and 90° without altering the grid surface area. Furthermore, these flaps facilitate adjusting the grid's inclination from 0 to 45° relative to the vertical, by compressing more or less depending on the angle of inclination.

[0188] For certain species of fish, the grids can also be fitted with screens in the upper part, above the water level, in order to prevent fish from jumping from one section to another.

[0189] As shown in [Fig. 8] and [Fig. 9], the grids are preferably held by rollers (35) or a trolley at the bottom, and / or supported by a rail (37) at the top above the water level to facilitate their movement for operators as much as possible. The grids can be moved manually using a handle (34) or a motorized device such as a geared motor, the grid being equipped with rollers (35) at the top which are positioned on a track (37) installed at the top of the basin. In addition, the rollers and the track also prevent friction with the basin slab (or floor) which could damage it.

[0190] According to one embodiment of the invention, the grids can be held in position in the basin by the action of their own weight.

[0191] 3.4. Step for removing a grid

[0192] The fish maturation / growth stage in an annular tank includes a stage of removing at least one grid, after transferring the batch of fish present in the section of the annular tank defined at least by the removed grid, to the outside of the annular tank.

[0193] This step of removing at least one grid may include a cleaning step before possibly reinserting it into an annular tank for a new growth / maturation cycle. During this cleaning step of the sectioning grid, the grid can be freed of impurities that may have adhered to it, more thoroughly than when it is left in place in the channel. Thus, the method and installation according to the invention can implement means for cleaning the grids, making it possible to keep them clean by removing biological deposits in order to optimize the flow of water through them.

[0194] Indeed, the removable nature of the grids allows them to be removed from the annular tank for cleaning, maintenance, or simply replacement, before being reintegrated into the annular tank. This allows them to be removed from the tanks when fixed equipment, such as non-removable internal circulators, is located in the path of the grids. Furthermore, this allows for an adaptable and variable configuration depending on the number of batches, the size of the fish, etc. Moreover, in the case of removable internal circulators, the grids can be removed at the operator's discretion; otherwise, they continue their path in the channel. In all cases, the grids are preferably moved in only one direction per channel.

[0195] The removal of a grid can be carried out manually or with a mechanical lifting system. The mechanical handling means is preferably of the monorail type equipped with a hoist and a manual trolley. In this case, all or part of the grid uprights are equipped with lifting rings.

[0196] As mentioned previously, in relation to the example in [Fig. 8] and [Fig. 9], the sectioning grids (13) can be modular, thus consisting of a stack of several horizontal parts, called panels (131, 132, 133), which can be removed to facilitate the removal of the grid. A sectioning grid can therefore comprise a bottom panel (131), and a top panel (132), with one or more intermediate panels (133).

[0197] The removal of the sectioning grid (13) can be carried out in several stages, including the disassembly of at least two panels. According to the embodiment illustrated in [Fig. 8] and [Fig. 9], first the grid is partially raised, the upper part (132) is disassembled and removed, then the optional intermediate part (133) is raised and then disassembled from the lower part (131), which is subsequently removed. This reduces the lifting height, resulting in lower construction costs and easier handling.

[0198] Since walkways can be installed above the water to access the central space (11) and the grates, notches can be integrated into the walkways to facilitate the removal of the grates or parts thereof. Thus, several notches can be made on the walkway along the circumference of the basin. In the case of non-removable circulators, two notches may be required before and after the area where these circulators are installed to accommodate the grates.

[0199] 3.5. Maintenance and cleaning step of the annular basin

[0200] Finally, the growth / maturation stage may include a maintenance and / or cleaning stage for the growth / maturation tank. This stage may be carried out manually on an intermittent basis, using means known to those skilled in the art, or it may be carried out sequentially by means mounted on the sectioning grids, or by specific means for cleaning annular tanks.

[0201] Thus, in order to remove any biofilm that may have accumulated on the walls and / or bottom of the annular tanks during aquaculture, the grid frame may incorporate cleaning means, including:

[0202] - the rubber mud flaps / seals (33) on the side sides and on the lower part Grid frames, in relation to [Fig.8] and [Fig.9], with or without a return system, allow the walls of the annular basin to be scraped and any biofilm removed; and / or

[0203] - manual or motorized rotary brushes, positioned vertically on the at least one side of the grid to clean at least one of the pool walls, and / or positioned horizontally at the bottom of the grid to clean the pool floor (or slab); and / or

[0204] - one or more pressurized water nozzle ramp(s).

[0205] Thus, the grids can contribute to maintaining the cleanliness of the wetted surface of the annular basin due to their sequential movement. The three sides in contact with the wetted surfaces of the annular basin can therefore be equipped with cleaning means (swishcloth, brush) that can help to remove any biofilm that may have formed on the walls and / or the bottom of the annular basin.

[0206] It is also possible to implement a sectioning grid specifically designed for cleaning, comprising only a frame without bars and cleaning means as described above. Figure 10 illustrates, for example, a frame comprising vertical rotating brushes (15) for cleaning the walls of an annular basin.

[0207] Furthermore, the removal of dead fish can be facilitated by a permanent or temporary tilt of the sectioning grid relative to the vertical, so as to push them upwards with the water flow. In addition, the injection of gas through one or more pipes (compressed air, etc.) (38) can be carried out at the bottom of the grids to lift the dead fish.

[0208] 3.6. Implementation examples

[0209] In annular growth / maturation tanks in the form of channels, a batch of fish is delimited by a set of two sectioning grids. The space allocated to a batch of fish can be adjusted by the Operator to accommodate the fish growth during the rearing period. To this end, the grids are preferably moved sequentially along the channel. As the rearing cycles progress, the batches can be moved along the channel, and when a batch reaches the end of the channel and / or the end of a growth / maturation cycle, it is transferred outside the channel. At least one of the grids delimiting the section of the fish batch is then raised for cleaning and replaced at the beginning of the channel.

[0210] According to a particular configuration, two removable, movable grids define a fish growth section throughout their growth cycle. At the end of the growth cycle, the two grids can be brought together to concentrate the fish and facilitate their removal by pumping for sorting and counting, for example, or by any other means of transfer. Then, at least one of the two grids can be removed for washing and reintegrated into the installation at the fish entry area to create a new growth section. Section management is thus simplified since all the grids can rotate in the same direction, thereby avoiding backtracking. Furthermore, this optimizes fish growth by improving animal welfare and limiting transfers. between sections via hatches in the grids (or other device). And finally, the absence of hatches helps to limit the cost of the grids.

[0211] The velocity within the same annular basin is globally identical within each of the sections.

[0212] According to a particular embodiment of the invention, the process comprises several growth / maturation stages. Thus, after a first growth / maturation cycle in a first annular growth / maturation tank, the fish can be transferred to a second annular growth / maturation tank for a second growth / maturation cycle. This transfer can be carried out through a hatch in the wall between the two annular tanks if they are contiguous, or by any other means of transfer. Thus, the process may include the following subsequent complementary stages, defining a second growth cycle: - insertion of at least two essentially vertical transverse grids, movable in translation and removable, in a second annular basin, contiguous to the first annular basin, defining a section of the second annular basin; - transfer of the batch of fish from the first annular tank to the section of the second annular tank, via a trap-type transfer means, for example; - translation, in the second annular basin, of the said at least two grids, during the maturation of the batch of fish within the section of the second annular basin; - removal of at least one of the aforementioned at least two grids, after transfer of the batch of fish at the end of a growth cycle to the outside of the second annular tank - Optional cleaning of the removed grille.

[0213] The grid, thus cleaned, can then be reused for a new growth / maturation cycle within an annular basin

[0214] Thus, two growth / maturation cycles can be implemented consecutively, in order to allow the fish to develop better.

[0215] 3.7. Description of the grids

[0216] The isolation grids can be made of composite materials, stainless steel, or any other material. More generally, all materials composing the installation and coming into contact with water are preferably food grade.

[0217] They can be rigid, partially flexible or totally flexible, in one or more interlocking parts, depending on the size of the fish farm. The grids can be made of bars and / or vertical and / or horizontal plates but They can also be combined with mesh and / or nets if these are locally available and cost-effective. They can be made up of one or more parts, depending on the available height above the basin for lifting or their weight in case of manual handling.

[0218] According to an example of an embodiment illustrated by [Fig.8] and [Fig.9], the sectioning grids (13) are modular and consist of a stack of two or more horizontal parts, called panels (131, 132, 133), these panels being more easily handled and able to be removed for cleaning or change if necessary.

[0219] Thus these annular basin grids can adapt to the water height of the basin, can be handled manually, limiting the building height required for their installation and removal.

[0220] A sectioning grid consists of at least a bottom panel (131) and a top panel (132). Depending on the water depth, one or more intermediate panels (133) are required. The panels are joined together by removable means (36).

[0221] In [Fig.8] and [Fig.9], the sectioning grids (13) are equipped with a single intermediate panel (133).

[0222] As illustrated in [Fig. 8] and [Fig. 9], each panel comprises a frame / chassis (31) supporting a set of bars (32), side flaps (33), and a lifting mechanism. The bottom panel (131) further comprises two casters (35) and a flap (33) on its lower part, mounted on the frame. The top panel (132) is equipped with two casters (35) and handles (44).

[0223] Thus, in the case of installations of modest size, such grids are easily handled by operators. Indeed, these grids can be easily moved manually or by lifting and handling equipment, but they can also be equipped with automation systems, allowing for simplified handling.

[0224] Advantageously, the sectioning grids can be fitted with bars whose cross-section and spacing are designed to prevent fish from passing through the grid while maintaining a high void ratio to limit the pressure drop generated by the circulation of the fish swimming water. The spacing can be adapted according to the size and species. It is between 5 and 60 mm. The void ratio will preferably be as high as possible to limit the energy consumption of the installation and advantageously greater than 50%. The grid bar will preferably be free of sharp edges so as not to injure the fish. Its cross-section can be selected according to the requirements.

[0225] According to one embodiment, the method includes a step of configuring the sectioning grids, during which the bar spacing can be modified. For example, this spacing can be managed by one or more racks, allowing the spacing to be changed by replacing the rack. An example of such a rack is illustrated in [Fig. 11] and [Fig. 12], in which the rack (17) consists of two parts, each comprising regularly spaced indentations of a defined size, thus defining the spacing of the grid bars (16). Each part of the rack is elongated and has a U-shaped cross-section, with the indentations located at the ends of each arm of the U.The bars are therefore placed in the indentations of the first rack section, and the second rack section can be added on top of the first section, above the bars, to space them evenly and hold all the bars in place. The sectioning grids are thus modular and can adapt to a change in use (change of species or size of fish).

[0226] Grids in which the bar spacing is achieved using racks are illustrated by the examples in [Fig. 8] and [Fig. 9], where racks (17) are used to maintain the spacing between each bar of the bar assembly (32). These racks are placed perpendicular to the bars and are arranged at essentially regular intervals to maintain the bar spacing over their entire height.

[0227] Advantageously, the grids may include supports to facilitate the attachment of flexible hoses.

[0228] 4. Water treatment and recirculation stage

[0229] According to a preferred embodiment of the fish farming process according to the invention, a water treatment and recirculation step is implemented by water treatment means and by water recirculation means. This step is advantageously carried out continuously. Furthermore, the water in the installation can circulate almost or entirely in a closed loop. Thus, almost all of the water is treated for recirculation in the pre-growing and / or growth / maturation tanks.

[0230] As previously stated in relation to the pre-growing stage, the water treatment means can be positioned either in the central space or outside the fish farming ponds.

[0231] Thus, depending on the type of surface available for development, the configuration of fish farming ponds and water treatment methods can be adapted.

[0232] According to a first embodiment illustrated by [Fig.2], the processing means (20) are contained within the central space (11). Such a configuration allows for a highly compact installation.

[0233] According to a second embodiment illustrated in [Fig. 3], the fish farming tanks (10) and the water treatment means (20) are contiguous, i.e., located in a space adjacent to the tanks, to reduce the footprint and length of the water pipes. In this embodiment, the water treatment means partially surround the outer annular tank. Thus, the proximity of the treatment means to the fish farming tanks reduces the length of the water pipes and the overall footprint of the installation. Furthermore, with the water treatment means located outside the fish farming area, the flow and costs are optimized.

[0234] According to another embodiment illustrated in [Fig. 4], the fish farming tanks (10) and the water treatment equipment (20) are located at a distance. Thus, the water treatment stages can, for example, be carried out in equipment aligned along a building to facilitate waste removal and reduce the need for ventilation ducts. By positioning the water treatment equipment at a distance from the fish farming tanks, the layout and footprint of the installation are optimized, and the treatment processes can be shared between several fish farming tanks.

[0235] These different examples of embodiments allow for optimization of costs and the footprint of the installation, while maintaining constant water quality during use, using optimized water treatment methods.

[0236] Furthermore, certain water treatment steps can be combined to further reduce the land footprint, such as biofiltration and mechanical or membrane filtration, degassing, foam removal, and oxygenation. In addition, to improve ammonium removal, one or more biological treatment steps can be added, as well as a membrane treatment.

[0237] Thus, in relation to [Fig. 2], [Fig. 3], and [Fig. 4], the water treatment steps may, for example, include: extraction of water from the fish farming ponds (10), filtration (21), biological treatment, for example using one or two fixed-biomass reactors such as a Moving Bed Biofilm Reactor (MBBR) (22), degassing (23) and oxygenation (24), and reinjection of the water into the fish farming ponds (10). However, other steps such as skimming, or the treatment of organic particles and molecules (feces, meal, geosmin, fatty acids, etc.) may also be implemented.

[0238] Furthermore, the invention also proposes the total or partial pooling of water treatment stages between two or more different fish farming ponds.

[0239] Thus, the process and installation according to the invention make it possible to optimize the water treatment steps, limiting construction and implementation costs, with greater freedom for the installation of water treatment equipment.

[0240] Thus, once the water has been treated, as previously described, it can be recirculated in the fish farming ponds (pre-growing and / or maturation) using recirculation means, such as a pump or circulator. The sludge resulting from this treatment can be treated within the facility or transferred to an external facility and reused. Therefore, the process according to the invention makes it possible to limit water consumption through reprocessing and recirculation.

Claims

Demands

1. A fish farming method implemented within a fish farming facility comprising at least one annular tank (12), the method being characterized in that it comprises the following steps: - insertion of at least two transverse grids (13), essentially vertical, movable in horizontal translation and removable, into the annular tank (12), defining a section of said annular tank; - transfer of a batch of fish into said section; - translation, within the annular tank (12), of said at least two grids (13), during the growth and / or maturation of said batch of fish within said section; - removal of at least one of said at least two grids (13), after transfer of the batch of fish at the end of a growth cycle to the outside of said annular tank (12) and in that it comprises a step of configuring said at least two grids (13), these comprising bars (16);said configuration step comprising a step of spacing said bars by a predetermined distance of between 5 and 60 mm, the step of spacing said bars by said at least two transverse grids comprising the fixing of at least one rack (17) on said bars, said at least one rack being placed perpendicular to said bars and having indentations to accommodate said bars.;

2. Fish farming method according to claim 1, characterized in that the removal of at least one of said at least two grids includes a disassembly of at least two horizontal panels (131, 132) constituting at least in part said at least one of said at least two grids.

3. Fish farming method according to any one of the preceding claims, characterized in that it comprises, after the removal of at least one of said at least two grids, the cleaning of said at least one of said at least two grids.

4. Fish farming method according to any one of the preceding claims, characterized in that said batch of fish remains in said section during said growth cycle.

5. Fish farming method according to any one of the preceding claims, characterized in that the section of said annular tank (12) defined by said at least two grids (13) is of variable size, the distance between said at least two grids (13) being able to vary according to the size and species of the fish of said batch.

6. Fish farming method according to any one of the preceding claims, characterized in that it comprises a sequential step of cleaning said at least one annular basin (12), using cleaning means (33) positioned in the lower part and / or on each side of said at least two grids (13).

7. Fish farming method according to any one of the preceding claims, characterized in that it comprises a preliminary pre-growing stage comprising the following steps: - introduction of a batch of young fish into a pre-growing tank; - pre-growing phase of the young fish in said pre-growing tank, within which a water flow is generated; the step of transferring the batch of fish into said section of the annular tank (12) being carried out from the pre-growing tank; the velocity V of the water flow within the annular tank (12) being greater than the velocity v of the water flow within the pre-growing tank.

8. Fish farming method according to the preceding claim, characterized in that the pre-growing tank is placed in the center of said at least one annular tank (12), said pre-growing tank being named central tank.

9. Fish farming method according to the preceding claim, characterized in that the step of transferring the batch of fish into said section of the annular tank (12) comprises the following steps: - concentration of said batch of fish in a part of the central tank, using mobile concentration means (14); - opening of a hatch (51, 52, 53) in the wall of the central tank included in the part delimited by the concentration means (14), for the transfer of the fish to said annular tank (12).

10. Fish farming installation for implementing the process according to any one of claims 1 to 9, said installation comprising at least one annular tank (12), said installation being characterized in that said at least one annular tank accommodates at least two transverse grids (13), essentially vertical, movable in horizontal translation, and removable, defining a section of said annular tank, intended for the growth and / or maturation of a batch of fish, and in that said at least two grids (13) are made up of at least two removable panels (131, 132), said at least two panels comprising a bottom panel (131) and a top panel (132).

11. Fish farming installation according to claim 10, characterized in that said at least two grids (13) are made up of said at least two panels which include a bottom panel (131), a top panel (132) and at least one intermediate panel (133).

12. Fish farming installation according to any one of claims 10 to 11, characterized in that it comprises a pre-growing tank, said installation comprising means for generating a flow of water flowing into said at least one annular tank (12) at a velocity V, and means for generating a flow of water flowing into said pre-growing tank at a velocity v lower than said velocity V.

13. Fish farming installation according to claim 16, characterized in that said pre-growing tank is located in a central space (11), in the center of said at least one annular tank (12).

14. Fish farming installation according to claim 17, characterized in that it comprises means for transferring fish (51, 52, 53) from said pre-growing tank to said at least one annular tank (12); said transfer means (51, 52, 53) comprising at least one hatch in the wall of said pre-growing tank, through which the fish can pass.

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