Aquaculture facility, fish production and procedures for operating an aquaculture facility

Abstract

Aquaculture system with a tank (1) for raising aquatic organisms, in particular fish (2), preferably saltwater fish, wherein the tank (1) is divided into at least two, preferably three, separate tank sections (4), wherein the aquatic organisms in the tank sections (4) are kept separately in groups according to different life stages, wherein the aquatic organisms of the individual groups are in the same life stage, wherein each tank section (4) is assigned a feeding device (5), wherein the quantity of feed to be added to each feeding device (5) is individually adjustable, wherein the quantity of feed is adjusted depending on a feed conversion ratio (FCR) of the aquatic organisms; wherein the tank (1) comprises at least one device for aeration with ambient air, preferably a side channel blower;wherein the ambient air is introduced into at least one basin section (4) via at least one air nozzle (9), wherein the at least one air nozzle (9) is arranged in the at least one basin section (4) such that a turbulent circular flow is created in the basin section (4), and wherein the circular flow inhibits sedimentation of particulate substances in the basin section (4).

Description

[0001] The invention relates to an aquaculture plant with a basin for the rearing of aquatic organisms, in particular fish, preferably saltwater fish, wherein the basin is divided into basin sections.

[0002] The invention further relates to fish production with an aquaculture plant and plant supply for the rearing of fish.

[0003] Furthermore, the invention relates to a corresponding method for operating an aquaculture plant for the rearing of aquatic organisms, in particular fish.

[0004] An aquaculture facility is a device for the controlled breeding, production, and harvesting of aquatic organisms. Aquaculture facilities are a suitable, sustainable approach to addressing the problem of overfishing in the world's oceans, given the increasing demand for aquaculture products. Alternatively, they can be used for breeding and stocking aquatic life for the purpose of repopulating natural or artificial bodies of water.

[0005] Aquaculture facilities are known in numerous designs in practice. They can be designed as open or closed systems. Open systems are installations integrated into a natural environment, particularly lakes, seas, and rivers, and utilize ecological cycles, especially the water cycle, for the rearing of aquatic organisms.

[0006] Aquaculture facilities of the type under discussion here are closed recirculating systems, largely isolated from environmental influences. They comprise at least one basin containing process water, particularly salt or fresh water, and an inlet and outlet, and are either open to the environment or sealed gas-tight. Advantageously, in a recirculating system, the process water is treated and recirculated outside the basin using mechanical clarification and biological filtration to reduce water consumption. The water exchange rate in a closed recirculating system is typically less than 10%.

[0007] DE 10 2008 033 528 A1 describes a fish breeding facility for saltwater fish with a fish breeding tank.

[0008] When raising aquatic organisms in a closed system, the natural nutrient cycles must be replicated by technical means to maintain the health of the aquatic organisms and enable optimal growth. In an aquaculture facility, this is achieved by monitoring and controlling the water biology, in particular the pH value, oxygen content, and infestation of diseases and pests, as well as by treating and removing waste products and pollutants using mechanical clarification technology and biological filtration systems. Relevant aquaculture facilities of the type in question are known in various embodiments in the prior art, and reference is made, by way of example, to DE 10 2019 100 296 A1.

[0009] US 2020 / 0113158 A1, US 2013 / 0206078 A1 and US 2022 / 0 104 466 A1 describe methods for raising aquatic organisms.

[0010] Maintaining the purity of process water from contaminants presents a significant challenge in practice and is always in need of improvement. Particulate substances, particularly metabolized excretions from aquatic organisms, but also feed residues, must be removed from the aquaculture system using mechanical separators, which impacts operating costs. Furthermore, excess feed that cannot be utilized by the aquatic organisms increases operating expenses, making it economically desirable to optimize feed input in the systems currently implemented.

[0011] The present invention therefore aims to design and further develop an aquaculture system of the type mentioned above in such a way that it can be operated economically. The quality of the farmed aquatic organisms should be optimized. Furthermore, the system should differ from competing systems. A fish production method that allows for the economically viable operation of an aquaculture system for fish farming should also be described. Finally, a corresponding method should be described.

[0012] According to the invention, the aforementioned problem with regard to the aquaculture system is solved by the features of claim 1. The aquaculture system in question comprises a tank for raising aquatic organisms, in particular fish, preferably saltwater fish. The aquatic organisms are kept separately in groups within the tank sections according to different life stages. The aquatic organisms in each group are at the same life stage. Each tank section is assigned a feeding system, the quantity of feed to be added to each feeding system being individually adjustable. The quantity of feed is adjusted depending on the feed conversion ratio (FCR) of the aquatic organisms.The basin comprises at least one device for aeration with ambient air, preferably a side-channel blower, whereby the ambient air is introduced into at least one basin section via at least one air nozzle. The at least one air nozzle is arranged in the at least one basin section such that a turbulent circular flow is created within the basin section, whereby the circular flow inhibits the sedimentation of particulate substances within the basin section.

[0013] With regard to fish production, the preceding problem is solved by the features of dependent claim 19. According to this claim, fish production comprises an aquaculture plant according to any one of claims 1 to 18.

[0014] With regard to the method, the preceding problem is solved by the features of dependent claim 22. This specifies a method for operating an aquaculture plant for raising aquatic organisms, in particular fish, preferably saltwater fish, according to any one of claims 1 to 18.

[0015] According to the invention, the aquaculture system's tank can be divided into separate sections. The aquatic organisms are raised in these sections in separate groups. The amount of feed supplied to each section is individually adjusted based on a feed conversion ratio. Only the amount of feed that the aquatic organisms can utilize for optimal growth, according to their current life stage and the prevailing conditions, particularly the water temperature, is supplied to each section. This optimizes and reduces feed consumption during aquatic organism rearing. Furthermore, the reduced amount of particulate matter, primarily unused feed, decreases the effort required to treat the process water in the aquaculture system.Accordingly, the operating costs of an aquaculture facility can be reduced.

[0016] The feed conversion ratio (FCR) is defined as the ratio of the amount of feed added (in kg) to the change in the net body weight of the aquatic organisms (in kg). It depends on the different life stages and thus on the net body weight of the aquatic organisms. Small aquatic organisms utilize the feed supplied to them more efficiently in terms of weight gain in the tank than larger ones. A positive weight gain is achieved for every amount of feed used.

[0017] The term "life stage" of an aquatic organism is to be understood in the broadest sense and describes the different developmental and growth phases throughout the entire life cycle of an aquatic organism. In fish, this is particularly the period from larva to reaching slaughter weight. The aquatic organisms are kept in separate sections of the tanks in groups at the same life stage.

[0018] The term "net body weight" of an aquatic organism refers to the physical mass of the organism without additional weight, in particular without adhering materials and artificial substrates, such as those found in the breeding of mussels.

[0019] The aquaculture system is advantageously suited for the rearing of aquatic animals, particularly fish, preferably saltwater fish, but also freshwater and brackish water organisms, especially mussels, crustaceans, shrimp, snails, and oysters. The system can also be used for cultivating aquatic plants such as algae, as well as for hydroponic crops such as lettuce and herbs. An aquaponics system configuration is also possible.

[0020] According to the invention, the aquatic organisms in the basin are kept separated into groups according to their life stage. For this purpose, the basin is subdivided into separate sections by water-permeable separating devices, for example, nets, perforated or gridded sheets, which, however, allow an exchange of process water between the individual basin sections.

[0021] In an advantageous embodiment, the separating device between the basin sections is designed in such a way that it can be opened to allow a simple exchange of the aquatic organisms between one basin section and another, without having to remove the aquatic organisms from the basin.

[0022] In a further advantageous aspect, the aquaculture system has tank sections of varying sizes. The size of the tank sections increases with the life stage of the aquatic organisms, so that they must be kept in a larger tank section at later stages of their life. As the aquatic organisms grow over time, the stocking density, expressed as the ratio of net body weight in kg to the volume of process water in m³, increases. 3The population in each section of the tank increases continuously. Therefore, the aquatic organisms are kept in one section of the tank for a defined period, preferably four months, according to their life stage, and then transferred to a larger section.

[0023] Alternatively, the timing of the relocation to a larger section of the pool can be determined by a maximum stocking density. For example, a maximum stocking density of 20 kg / m³ could be set for a pool with three sections. 3 for the smallest section, 40 kg / m 3 for the medium-sized section and 80 kg / m 3 to be chosen for the largest section.

[0024] Preferably, the pelvic sections are arranged in ascending order of size.

[0025] In a technically advantageous embodiment of the aquaculture system, the amount of feed to be supplied to the individual sections of the culture tank is determined by the net body weight of the aquatic organisms. For example, the amount of feed to be supplied per tank section can be determined via an empirical correlation, plotted as the feed conversion ratio against the net body weight of a specific aquatic organism.

[0026] Preferably, the feed conversion ratio lies within a range of 0.8 to 3.

[0027] Furthermore, the aquaculture system can include an automatic feeding system and provide for the automatic feeding of aquatic life, where the amount of feed to be supplied is automatically determined individually for each section of the tank. For this purpose, the feeding system is expediently controlled based on the feed conversion rate of the aquatic life.

[0028] Furthermore, the aquaculture plant can be equipped with a device for temperature control of the process water in the tank sections, for example with an air-to-water heat exchanger.

[0029] According to the invention, at least one aeration device is provided in the aquaculture system's basin, introducing ambient air into the process water. The air can be drawn in from the environment via a compressor, preferably a side-channel compressor, and flow out into the process water in the basin via at least one air supply line and at least one air nozzle.

[0030] According to the invention, the at least one air nozzle in the individual basin section is arranged such that a turbulent circular flow forms in the process water. The turbulent flow prevents the sedimentation of particulate substances contained in the process water.

[0031] In another embodiment, the aquaculture system's basin includes at least one oxygenation device that introduces oxygen (O2) into the process water via oxygen supply lines. Technical grade oxygen is preferably used. The oxygenation device can comprise a pressurized cylinder system and / or a PSA oxygen generator as the oxygen source.

[0032] Oxygen can be introduced into the process water via a ceramic diffuser located in at least one section of the tank. The formation of small micro-gas bubbles allows the oxygen to adsorb into the process water with high efficiency. Preferably, the ceramic diffuser, in combination with a pressurized cylinder system, serves as an oxygen source in the aquaculture system for short-term increases in the oxygen content of the process water, for example, to cover peak loads or in case of emergency oxygen supply.

[0033] Furthermore, oxygen can be introduced into the process water via a low-head oxygenator (LHO). The low-head oxygenator comprises at least one reaction chamber, in particular a trickle hopper, in which the surface area of ​​the process water introduced at the top of the column is increased. The additionally introduced oxygen adsorbs onto the enlarged surface area. Preferably, the low-head oxygenator is used for continuous oxygen enrichment in the process water, as a base load supply, in combination with the PSA oxygen generator as the oxygen source.

[0034] In another advantageous embodiment, the process water is pumped from the culture container through a fluid line in a closed circulating system.

[0035] The flow rate of the main circulation pump is expediently set in such a way that a sufficiently high water exchange rate ensures the removal of particulate substances and pollutants and / or prevents sedimentation of the particulate substances by turbulent flows in the basin sections.

[0036] The term "water exchange rate" is defined as the ratio of the pump's flow rate per unit of time to the total volume of process water in the tank. Ideally, the water exchange rate should be at least twice the tank volume per hour.

[0037] In a further advantageous embodiment, the aquaculture system has separation devices for removing particulate substances, in particular feed residues and excretory products, from the process water. Preferably, the separation of the particles is size-selective, for coarse particles with a critical particle size greater than or equal to 60 µm and for fine solids with a critical particle size less than 60 µm.

[0038] For coarse particles, a mechanical separation device, preferably a drum filter, is provided. The drum filter comprises a drum with a screen insert of defined mesh size, preferably less than 60 µm, a flushing nozzle with a collection trough, an inlet, and a return.

[0039] The particle-laden process water enters the drum via the inlet. Coarse particles are retained by the screen insert. Advantageously, the drum is rotated incrementally around its rotationally symmetrical axis at regular intervals, and the particle-laden section of the drum is cleaned by the spray nozzle. The resulting wastewater is discharged via the collection trough. The low-particle, cleaned process water is preferably pumped to downstream water treatment facilities.

[0040] Alternatively or in addition to the drum filter, a sedimentation tank can be provided, which treats the process water via gravity by enriching the wastewater near the bottom with the particles and thus allowing the near-surface, particle-free process water to be returned.

[0041] For particles smaller than 60 µm, a skimmer can be used that utilizes the flotation principle as a separation mechanism. The skimmer comprises a vertical column, an inlet at the top, and a return at the bottom, as well as an air bubble generation system, preferably a Venturi system. The skimmer operates countercurrently, with the process water being fed into the upper part of the column and exiting at the bottom under the influence of gravity. The air bubbles introduced via the Venturi system rise in the column due to buoyancy. During flotation, the fine particles adhere to the interface of the rising air bubbles due to interfacial tension, leading to the formation of foam that can be separated in the upper part of the column.

[0042] In another embodiment, an ozone generator is provided in the recirculating system of the aquaculture plant, which generates ozone from technical or atmospheric oxygen under the influence of electrical energy. The ozone produced serves to disinfect the process water by inactivating the bacteria it contains. Preferably, the ozone generator is connected to the protein skimmer and introduces the generated ozone there. The ozone then promotes foam formation in the skimmer.

[0043] In another embodiment, the aquaculture system includes at least one biological filter device for converting toxic nitrogen compounds. These are primarily nitrogen compounds from proteins, which are excreted, for example, as urea or ammonia. The conversion preferably takes place via an aerobic biofilter for nitrification. In this process, the bound nitrogen is converted to nitrate by bacterial oxidation with the supply of oxygen, preferably atmospheric oxygen. The bacteria responsible for the conversion are applied to a carrier material, preferably pellets.

[0044] In a further advantageous embodiment of the invention, an anaerobic biofilter can be provided for denitrification. This converts the nitrate from the aerobic biofilter to molecular nitrogen (N2) with the aid of bacteria under oxygen-free conditions and with the supply of substrate, in particular a carbon source. The gas produced can escape into the environment.

[0045] Furthermore, a device for removing carbon dioxide from the process water is advantageous. The process water is fed into a CO2 desorption unit, designed as an airlift. The carbon dioxide (CO2) desorbs through interaction with the air bubbles as it rises in a vertically positioned column and is thus removed from the process water. The degree of carbon dioxide desorption from the process water is determined by the height of the water column inside and the volume flow rate of ambient air supplied through it.

[0046] The fish production system according to the invention comprises an aquaculture system of the type described above. Specifically, the aquaculture system's tank, the air and oxygen supply devices, and the process water treatment devices can be placed in three standard containers arranged lengthwise alongside one another. The system's supply system comprises two spatially separate areas in a further standard container arranged lengthwise alongside the standard containers of the aquaculture system. The first area includes work surfaces for harvesting the fish. The second area provides storage space for fish-related equipment, feed, operating supplies, and system spare parts, as well as space for the control cabinet, ozone generator, blower, oxygen generator, and feeding equipment for the aquaculture system.

[0047] Furthermore, fish production can include fish processing, which is housed in a standard container arranged lengthwise alongside the standard containers of the aquaculture plant and plant supply system. The fish processing area can, in turn, comprise three sections: a hygiene area for personnel, a cold storage area, and a processing area with work surfaces for gutting, washing, weighing, sorting, and packaging the fish.

[0048] The method according to the invention comprises operating an aquaculture plant of the type described above for raising aquatic organisms, in particular fish, preferably saltwater fish.

[0049] There are now various ways to advantageously elaborate and further develop the teaching of the present invention. Reference is made, on the one hand, to the claims subordinate to claim 1 and, on the other hand, to the following explanation of preferred embodiments of the invention with reference to the drawings. In conjunction with the explanation of the preferred embodiments of the invention with reference to the drawings, generally preferred embodiments and further developments of the teaching are also explained. The drawings show: Fig. 1 in a schematic view an embodiment of a basin with a plurality of basin sections, subdivided with openable separating devices and each with an individually assigned feeding device per basin section; Fig. 2 in a schematic view an embodiment of an aquaculture plant with a basin according to Fig. 1 and a process water circuit, ventilation and oxygen supply; Fig. 3 in a schematic view an embodiment of an aquaculture plant with a tank and a process water circuit according to Fig. 2 with mechanical clarification technology and biological filter system; Fig. 4 in a schematic view the spatial arrangement of the pool sections of different sizes of a pool with an openable separating device; Fig. 5 in a schematic view an embodiment of a fish production with aquaculture plant and plant supply, housed in four standard containers; Fig. 6. A schematic view shows an embodiment of a fish production facility with an aquaculture plant, plant supply and fish processing, housed in five standard containers; and Fig. 7 in a diagram a schematic course of the dependence of the feed conversion ratio, plotted against the net body weight of the aquatic organisms.

[0050] Fig. Figure 1 shows a schematic view of an embodiment of the tank (1) of an aquaculture system in which groups of fish (2) are kept for rearing in process water. The tank (1) comprises two openable dividers (3) that subdivide the tank (1) into three tank sections (4) of different sizes, in which the groups of fish (2) are kept separately according to their life stage. Each tank section (4) is assigned an individual feeding system (5) designed to supply the groups of fish (2) in the respective tank sections (4) with the amount of feed that can actually be utilized according to their life stage.

[0051] Fig. Figure 2 shows the basin (1) of an aquaculture facility according to Fig. 1 with a pump (6) that conveys the process water via fluid lines in a closed process water circuit.

[0052] Furthermore, the basin (1) in the exemplary embodiment in Fig. 2. Ambient air ventilation. Air is drawn in from the environment via a compressor (7) and transported into the basin (1) via an air supply line (8). The ambient air is introduced into the process water through the air nozzles (9). Furthermore, the basin (1) includes a ceramic diffuser (10) in each basin section, which is connected to the oxygen source (12) via oxygen supply lines (11). Advantageously, several ceramic diffusers (10) can also be provided in the individual basin sections.

[0053] Fig. Figure 3 shows the basin (1) of an aquaculture facility according to Fig. 2. The closed process water circuit also integrates a drum filter (13), an aerobic biofilter (14), and a low-head oxygenator (15). The low-head oxygenator (15) is supplied with oxygen from an oxygen source (12). The aerobic biofilter (14) is connected to the compressor (7) via an air supply line (8).

[0054] Furthermore, a sedimentation tank (16) for separating particulate substances is connected to the drum filter (13). A portion of the treated process water from the drum filter (13) is pumped (17) into the skimmer (18). Ozone is added to the process water in the skimmer (18) via an ozone generator (19). The remaining portion of the treated process water from the drum filter (13) is pumped (17) into the anaerobic biofilter (20). Substrate (21) is also added to the anaerobic biofilter (20). After exiting the skimmer (18) and the anaerobic biofilter (20), the treated process water streams are returned to the tank (1).

[0055] Fig. Figure 4 shows the spatial configuration of the basin sections (4) of the basin (1) of an aquaculture system. The basin (1) has an L-shaped base and consists of three basin sections (4) of unequal size – a small, a medium, and a large basin section (4a, 4b, 4c). The basin sections (4) are arranged spatially such that their size increases from small to large. The small basin section (4a) adjoins one side of the medium basin section (4b), while the large basin section (4c) is located at a 90° angle to the side of the medium basin section (4b). The basin sections (4) are separated from each other at their adjacent areas by an openable, water-permeable partition (22). The openable, water-permeable partition (22) is preferably designed as a mesh, perforated sheet, or grid.

[0056] Furthermore, in Fig. Figure 4 shows the arrangement of the air nozzles (9) in two pool sections (4b, 4c). One air nozzle (9) is positioned in a corner of the middle pool section (4b), and the nozzle opening is oriented such that the air flows out parallel to the pool wall (23). This creates a turbulent circular flow in the middle pool section (4b). In the large pool section (4c), two air nozzles (9) are positioned in diagonally opposite corners, so that the nozzle openings face in opposite directions. Both air nozzles (9) flow the air out parallel to the pool wall (23), thereby creating a turbulent circular flow.

[0057] Fig. Figure 5 shows an embodiment of a fish production system with an aquaculture plant (24) and plant supply (25), which are housed in four standard containers (26). The aquaculture plant (24) extends over three standard containers (26) arranged lengthwise next to each other. The tank (1) is located in the rear part of the aquaculture plant (24) and has an L-shaped base. Additionally, the standard containers (26) contain a drum filter (13), an aerobic biofilter (14), four parallel low-head oxygenators (15), a sedimentation tank (16), a protein skimmer (18), and an anaerobic biofilter (20). An air-to-water heat exchanger (27) is attached to the outside of one standard container (26) of the aquaculture plant (24). The standard container (26) for the plant supply (25) is placed lengthwise on the standard containers (26) of the aquaculture plant (24), resulting in a rectangular base area.The system's supply area is divided into two spatially separate sections. The first section comprises a work area for harvesting (28) and storage space (29) for fish equipment. The second section provides storage space (29) for feed, operating supplies, and system spare parts, as well as space for a control cabinet (30), oxygen generator (31), ozone generator (19), and feeding equipment (5) for the tank sections (4) of the aquaculture system (24). Preferably, the blower (7) is also located in this section.

[0058] Fig. Figure 6 shows an embodiment of a fish production facility with an aquaculture plant (24), plant supply (25) housed in standard containers (25) according to Fig. 6, which is extended by a fish processing unit (32) housed in a standard container (26). The standard container (26) for fish processing (32) is positioned lengthwise alongside the standard containers (26) of the plant supply (25), so that these, together with the standard containers (26) of the aquaculture plant (24) and the plant supply (25), form a rectangular footprint. The fish processing unit (32) includes a hygiene area (33) for employees, several processing areas (34), a packaging station (35), and a cold storage area (36).

[0059] Fig. Figure 7 shows a diagram schematically illustrating the relationship between the feed conversion ratio and the net body weight of aquatic organisms in kg. How Fig.As can be seen from the degressive curve in Figure 7, the feed conversion ratio depends on the net body weight of the aquatic organisms and decreases with increasing net body weight. Aquatic organisms with a large net body weight utilize feed less efficiently in terms of growth than smaller aquatic organisms.

[0060] Regarding further advantageous embodiments of the device according to the invention, reference is made to the general part of the description and to the attached claims in order to avoid repetition.

[0061] Finally, it should be expressly pointed out that the exemplary embodiments of the device according to the invention described above serve only to discuss the claimed teaching, but do not limit it to these exemplary embodiments. Reference symbol list 1 basin 2 fish, group of fish 3 Openable separating device 4. Pelvic section 4a Small pool section 4b middle pelvic section 4c large pelvic section 5 Feeding equipment 6 pump 7 compressors 8 Air supply line 9 air nozzle 10 ceramic diffusers 11 Oxygen supply line 12 Oxygen source 13 drum filters 14 Aerobic Biofilters 15 Low-Head Oxygenator 16 sedimentation tanks 17 Pump 18 skimmers 19 ozone generator, ozone generator 20 Anaerobic Biofilters 21 Substrat 22 Separating device 23 Pool wall 24 Aquaculture facility 25 Plant supply 26 standard containers 27 Air-to-water heat exchangers 28 Working area for fishing 29 storage areas 30 Control cabinet 31 oxygen generators 32 Fish processing 33 Hygiene area 34 processing area 35 Packaging station 36 cold storage rooms, cold storage rooms

Claims

[1] Aquaculture system with a tank (1) for the rearing of aquatic organisms, in particular fish (2), preferably saltwater fish, wherein the tank (1) is divided into at least two, preferably three, separate tank sections (4), wherein the aquatic organisms in the tank sections (4) are kept separately in groups according to different life stages, wherein the aquatic organisms of the individual groups are in the same life stage, wherein a feeding device (5) is assigned to each tank section (4), wherein the quantity of feed to be added to each feeding device (5) is individually adjustable, wherein the quantity of feed is adjusted depending on a feed conversion ratio (FCR) of the aquatic organisms; wherein the tank (1) comprises at least one device for aeration with ambient air, preferably a side channel blower;wherein the ambient air is introduced into at least one basin section (4) via at least one air nozzle (9), wherein the at least one air nozzle (9) is arranged in the at least one basin section (4) such that a turbulent circular flow is created in the basin section (4), and wherein the circular flow inhibits sedimentation of particulate substances in the basin section (4). [2] Aquaculture plant according to claim 1, wherein the division into the individual basin sections (4) is designed as an openable separating device (3), preferably in the form of a net, perforated and / or grid sheet. [3] Aquaculture plant according to claim 1 or 2, wherein the size of the individual basin sections (4) is unequal, wherein the size of the basin sections (4) increases with the progressing life stage of the aquatic organisms and wherein the basin sections (4) are arranged in ascending order of size. [4] Aquaculture plant according to one of claims 1 to 3, wherein the feed conversion ratio is determined by the body weight of the aquatic organisms, and wherein the feed conversion ratio is between 0.8 and 3. [5] Aquaculture plant according to one of claims 1 to 4, wherein the aquaculture plant (24) comprises a temperature control device for the process water, preferably an air-to-water heat exchanger (27). [6] Aquaculture plant according to one of claims 1 to 5, wherein a supply device for introducing oxygen, preferably technical oxygen, is provided for each of the individual tank areas. [7] Aquaculture plant according to claim 6, wherein the oxygen supply comprises a pressurised oxygen storage, in particular a pressurised gas cylinder, as the oxygen source (12). [8] Aquaculture plant according to claim 6 or 7, wherein the absorption of oxygen in the process water comprises at least one ceramic diffuser (10). [9] Aquaculture plant according to one of claims 1 to 8, wherein at least one pump (6) is provided which pumps the process water via a fluid line in a closed process water circuit. [10] Aquaculture plant according to claim 9, wherein the pump (6) has a delivery volume to ensure a water exchange rate in the tank (1) of at least twice the tank volume per hour. [11] Aquaculture plant according to one of claims 9 or 10, wherein the process water circuit comprises at least one separation device for separating particulate substances. [12] Aquaculture plant according to claim 11, wherein the separation device comprises a drum filter (13) and / or a sedimentation tank (16), preferably for separating particulate substances with a critical particle size of at least 60 µm. [13] Aquaculture plant according to one of claims 11 or 12, wherein the separation device comprises a skimmer (18), preferably for separating particulate substances with a critical particle size of less than 60 µm. [14] Aquaculture plant according to one of claims 1 to 13, wherein an ozone generator (19) is provided, and wherein the ozone serves to disinfect the culture water. [15] Aquaculture plant according to one of claims 10 to 14, wherein the process water cycle comprises at least one biological filter device for converting pollutants dissolved in the process water, preferably an aerobic biofilter for nitrification. [16] Aquaculture plant according to claim 15, wherein an anaerobic biofilter (20) is provided for denitrification, in particular by supplying substrate (21), preferably a carbon source. [17] Aquaculture plant according to one of claims 11 to 16, wherein the process water circuit comprises at least one oxygen absorption device, preferably a low-head oxygenator (15). [18] Aquaculture plant according to one of claims 11 to 17, wherein the process water circuit comprises at least one device for carbon dioxide desorption, preferably an airlift. [19] Fish production comprising an aquaculture plant (24) according to any one of claims 1 to 18. [20] Fish production according to claim 19, with a plant supply (25), wherein the aquaculture plant (24) is housed in three standard containers (26), in particular in three 40-foot insulated containers, and the plant supply (25) is housed in one standard container (26), in particular in one 40-foot insulated container, wherein the plant supply (25) comprises an area for harvesting (28) and storage facilities for fish accessories, feed, operating materials and plant spare parts, and wherein the standard container (26) of the plant supply (25) is preferably arranged longitudinally to the standard container (26) of the aquaculture plant (24). [21] Fish production according to claim 20, comprising a fish processing plant (32), wherein the fish processing plant (32) is housed in a standard container (26), in particular in a 40-foot insulated container, wherein the fish processing plant (32) comprises a hygiene area (33), a work area for processing and packaging and a cold storage room (36), and wherein the standard container (26) of the fish processing plant (32) is preferably arranged longitudinally to the standard container (26) of the plant supply (25). [22] Method for operating an aquaculture plant (24) with a tank (1) for raising aquatic organisms, in particular fish (2), preferably saltwater fish, according to any one of claims 1 to 18.

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