243results about "Fishing vessels" patented technology

The utility model discloses a photovoltaic energy storage fishing boat which comprises a fishing boat body, a storage battery box body is installed inside the fishing boat body, and a rotating disc is installed at the top end of the storage battery box body in a rotating mode. A solar photovoltaic panel is arranged at the top of the rotating disc, hydraulic cylinders are fixedly mounted on the two sides of the top end of the rotating disc, first auxiliary shafts are fixedly mounted on the top ends of the two hydraulic cylinders and the two sides of the middle of the bottom end of the solar photovoltaic panel, and a light sensor senses the illumination angle and transmits a signal to a controller; and then the solar energy is transmitted to the corresponding hydraulic cylinder and the motor through the controller, the motor and the hydraulic cylinder can be driven to operate, so that the effect of changing the deviation angle and the rotation angle of the solar photovoltaic panel is achieved, the solar photovoltaic panel can always face a solar light source by adjusting the angle of the solar photovoltaic panel, and the energy of sunlight is absorbed to the maximum extent. The photovoltaic power generation efficiency can be improved, and a photovoltaic system can generate more electric energy under different weather conditions.

The invention discloses a water robot which comprises a maneuvering body, a power propelling device and an operation function mechanism. The maneuvering main body can float on the water, the maneuvering main body is provided with weight loads which are arranged on the same plane and are distributed in a triangular mode, and the connecting position or the acting point between the operation function mechanism and the maneuvering main body is close to the gravity center position of the weight loads which are distributed in the triangular mode of the maneuvering main body. The problem of inclination or overturning caused by unbalanced stress can be avoided when the water robot executes working conditions such as dragging operation, grabbing operation or fish luring operation, good balance and stability are kept, and it is guaranteed that the operation process is smooth and reliable; more importantly, the operation function mechanism is at least one or a combination of multiple of a dragging device, a grabbing device and a fish luring device, so that the maneuvering main body can select, match and expand the operation function mechanism according to different application scenes, and therefore, the robot further has the characteristics of function expandability and flexibility.

The utility model discloses an oyster harvesting device and a ship, and relates to the technical field of oyster harvesting equipment, the oyster harvesting device comprises a stripping structure and a traction assembly; the stripping structure is provided with a traction channel and a blade assembly arranged around the traction channel. The movable end of the traction assembly penetrates through the traction channel and is used for being connected with an oyster row. The traction assembly is used for pulling the oyster row to move in the direction close to the blade assembly, so that the fresh oysters on the oyster row are blocked by the blade assembly to be separated from the oyster row. According to the technical scheme that the traction assembly is matched with the peeling structure, the movable end of the traction assembly is used for pulling the oyster row to move in the direction close to the blade assembly, so that the fresh oysters on the oyster row are blocked by the blade assembly and are separated from the oyster row. The most easily damaged part of the existing fresh oyster harvesting equipment is a movable stripping structure, and the stripping structure and the blade assembly are static parts, so that the fresh oyster harvesting equipment does not need to move and is not easily damaged, and the reliability of the fresh oyster harvesting equipment is improved.

The telescopic fishing device comprises a fishing rod assembly, a furling assembly and a fishing luring assembly, the fishing rod assembly is composed of a plurality of hollow rigid fishing rods which are telescopically connected, and a traction line is directly connected with the tail ends of the fishing rods, so that the low-efficiency mode that a traditional telescopic fishing rod is manually pushed and pulled section by section is broken through; the high requirements of modern fishing enthusiasts on diversified scene adaptability and use experience can be better met, and the telescopic fishing rod has the advantages of being convenient to store, efficient and labor-saving in telescopic operation and reliable in structure. The invention further discloses a mobile platform, an annular fishing platform and a fishing method. The aspects of the space utilization rate, the operation stability, the user experience, the function expansibility and the like can be remarkably improved.

A robotic throttle-control system for controlling a throttle-power setting of a throttle of a fishing vessel is provided. The control unit has a processor unit that instructs the control unit of the throttle-power setting at which to set the throttle and a time span for maintaining the throttle at the throttle-power setting. A user interface of the control unit has a dual-mode switch that communicates to the processor unit through both a rotational position of the dual-mode switch and an axial position of the dual-mode switch.

The invention discloses a deep and far sea seedling raising, breeding, refrigerating, processing and guaranteeing integrated floating fishery base, and relates to the technical field of deep sea breeding, the deep and far sea seedling raising, breeding, refrigerating, processing and guaranteeing integrated floating fishery base comprises a ship body, the ship body is provided with a breeding processing system and a snorkeling system, the breeding processing system comprises a capturing cabin, a breeding cabin, a freezing cabin and a processing cabin, and the snorkeling system comprises a ballast cabin; the capturing cabin is used for capturing fish schools in deep sea, the breeding cabin is used for breeding fish fries laid by female fishes in the fish schools to be formed, the freezing cabin is used for refrigerating the formed fishes, the processing cabin is used for processing the refrigerated fishes, the ballast cabin is used for containing seawater, and the ship body floats or dives by adjusting the seawater amount of the ballast cabin. A complete production line can be formed in the deep sea, resources are saved, and efficiency is improved.

The invention relates to the field of euphausia superba fishing boat design and manufacture, in particular to an euphausia superba boat truss automatic folding and unfolding system which comprises a truss, a driving device, a hydraulic system and an intelligent control system. Rapid unfolding and retracting of the truss are achieved through equipment such as the rotary truss, the thrust oil cylinder and the steel wire rope winch, flexible operation of a ship under the complex sea condition is facilitated, and the fishing efficiency is improved; the automation degree is high, the difficulty and complexity of manual operation are reduced, and the long-term operation cost is reduced. The intelligent control system can monitor the environment condition and the state of the truss in real time, it is guaranteed that unfolding or retracting operation is not executed under the unsuitable condition, and therefore safe operation of equipment and safety of personnel are guaranteed.

The utility model discloses a breeding work ship which comprises a ship body, a traction device arranged on the ship body, a lifting device arranged on the cabin, a lifting channel arranged on a deck corresponding to the lifting device, and a sealing outlet door arranged on an outlet of the lifting channel. A vacuum fish suction pump and a lifting machine are arranged on a deck of the ship body, a fish discharging opening of the vacuum fish suction pump is connected with a fish sorting machine, a fish outlet of the fish sorting machine is communicated with an outer sliding way, and a containing box is arranged at the other end of the outer sliding way. The cabin comprises a heat preservation fish bin, a transportation bin, an equipment cabin and other function bins, the other end of the outer sliding way is arranged on the upper portion of the heat preservation fish bin, the containing box is arranged in the heat preservation fish bin, aquatic products in the breeding platform are caught through the vacuum fish suction pump, the aquatic products are directly put into the heat preservation fish bin through the fish sorting machine and the outer sliding way, labor loss is effectively reduced, and breeding benefits are improved.

The present invention relates to the technical field of storage of fish catches in fishing vessels, and in particular to a cold seawater tank, comprising a tank body, wherein the interior of the tank body is hollow to form a closed cavity, and the tank body is provided with a draining tank device, a suction pipe, a return pipe and a circulation pipe all of which are connected to the cavity, wherein the draining tank device is used to transport the fish catches into the cavity, the suction pipe is used to output the fish catches in the cavity, the return pipe is used to input seawater into the cavity, and the circulation pipe is used to connect with a refrigeration device and realize the circulation refrigeration of the seawater in the cavity. The fish catches are sent into the cavity of the tank body through the draining tank device, and the mixture of the fish catches and seawater in the cavity is outputted to a subsequent processing line by the suction pipe. At the same time, the cavity is supplemented with seawater by the return pipe, and the circulation pipe is connected to the refrigeration device to circulate and refrigerate the seawater in the cavity, so as to ensure that the seawater in the cavity of the tank body is sufficient and the seawater temperature is maintained to meet the requirements, thereby greatly reducing manual operations, simplifying the operation process, and being able to adapt to the continuous operation of fishing vessels.

The invention is a hose crane for a wellboat, comprising a crane arm (130) rotatable at least in the vertical plane on a rotatable swivel base (100), at least one rail (130) along the crane arm (130) for pulleys (140) distributed along the guide rail (132). The pulleys (140) suspend hose brackets (160) distributed along a suction hose (150). The suction hose (150) is arranged to extend from a wellboat's (105) inlet (107) and out to a suction nozzle (152). The suction hose (150) comprises an elongated, flexible inner hose portion (150i) extending from a crane foundation (102) to an elongated, central hose section (150m) with evenly spaced hose brackets (160) which are held underthe pulleys (140) freely movable in the longitudinal direction of the crane arm (130), and an outer elongated flexible section (150y) with a suction nozzle (152) held in a lifting wire (172) near an outer end of the crane arm (130).

The present invention discloses a fish storage device based on an ocean fishing vessel, which relates to the field of ocean fisheries, and comprises a storage bin and a bin-adjusting movable wallboard, wherein a bin inlet is arranged on the top of the storage bin, a bin outlet door is installed on the side of the storage bin, and the bin-adjusting movable wallboard is installed in the storage bin, and the bin-adjusting movable wallboard divides the interior of the storage bin into two independent areas, wherein the area close to the bin inlet is a pre-storage area, and the other area is a storage area, and the bin-adjusting movable wallboard can move in the storage bin to change the effective volume of the storage area, and a conveyor belt is installed in the storage bin below the bin-adjusting movable wallboard. The present invention realizes that an appropriate space margin can always be maintained in the storage area for storing fish, so when the hull is bumpy during driving, due to the limited space margin in the storage area, the shaking amplitude of the fish is greatly reduced, thereby both ensuring the quality of the fish and reducing the damage to the hull.

The present invention provides an unattended refrigeration control method and system for a fishing transport vessel, which relates to the field of fishery refrigeration control technology, including obtaining the structural information, usage information and product information of the refrigerated compartment of the fishing transport vessel; constructing a three-dimensional space model based on the refrigerated compartment structural information, and performing product transportation simulation to obtain a transportation simulation model; using image recognition to determine the product category, and performing refrigerated compartment allocation simulation; analyzing the product quality changes at different transportation times and refrigeration temperatures based on historical product information; sending the above information to a multi-objective optimization model, predicting the optimal refrigeration temperature, and adjusting the refrigeration equipment in real time. The present invention realizes unattended refrigeration control of fishing transport vessels, optimizes refrigerated compartment allocation, improves product quality, and reduces transportation costs.

To provide a nori cultivation box boat equipped with a reaction liquid treatment mechanism having a vertical two-tier structure of a treatment tank and a storage tank, the nori cultivation box boat achieving enhanced strength of the bottom wall of the treatment tank and ensuring stability even when a treatment liquid or other liquid is stored within the storage tank.SOLUTION: A nori cultivation box boat comprising a box boat body 2 and a reaction liquid treatment mechanism 3 provided on an upper surface of the box boat body for performing reaction liquid treatment of cultivated nori, wherein the reaction liquid treatment mechanism 3 has a vertical two-tier structure of a treatment tank 4 for performing reaction liquid treatment of the cultivated nori by immersing the nori in a reaction liquid, and a storage tank 5 for storing a treatment residue liquid after the reaction liquid treatment, and wherein reinforcing means 6 is provided within an internal space of the storage tank 5 to support a lower surface of a bottom wall of the treatment tank 4 from below.SELECTED DRAWING: Figure 2

The invention relates to the technical field of fishery equipment, and discloses a culture cabin capable of changing water based on ocean wave energy and a semi-submersible type sea-opening culture work ship, the culture cabin comprises a ship body, the culture cabin is arranged below a deck of the ship body, the culture cabin comprises a cabin, a sea-opening water changing opening is formed in the broadside of the cabin, and a water outlet pipeline communicated with a seabed water changing opening is arranged at the bottom of the cabin; and a first one-way valve for draining water outwards from the cabin is arranged on the water outlet pipeline, and when surges enter the cabin from the sea-opening water changing opening and generate pressure difference exceeding preset pressure, the first one-way valve is opened to conduct one-way water draining to the outside of the ship till the inner pressure difference and the outer pressure difference are the same, the cultivation work ship utilizes wave energy to drive water changing, energy consumption can be remarkably reduced, and water changing uniformity can be improved. The seawater quality can meet the culture requirement, and the operation cost of open-sea culture is reduced.

A live fish cabin fish protection system and method special for complex sea conditions comprises a fish cabin, anti-collision wall bodies are installed in the fish cabin, the anti-collision wall bodies are the same in structure, the two anti-collision wall bodies on the opposite sides correspond to each other and are connected, and the structure of each anti-collision wall body comprises anti-collision strips which are sequentially distributed at intervals from top to bottom; the anti-collision strips are fully distributed along the bulkhead, all the anti-collision strips are communicated with one another, and each anti-collision strip is provided with injection orifices which are uniformly distributed; a fish protection system is arranged between the two anti-collision wall bodies on the opposite sides, and each fish protection system structurally comprises a water pump, the two ends of each water pump are connected with water outside the ship and a discharge port respectively, and meanwhile the two ends of each water pump are connected with the anti-collision wall bodies in parallel through control valves. Through unique design of the fish cabin and installation of the anti-collision walls on the periphery, survival of fishes is effectively protected, the fish cabin can adapt to complex sea conditions, and live fishes are prevented from impacting the cabin wall due to shaking of a ship in the fish cabin, so that survival of the fishes is protected, and the survival effect of the live fishes caught by voyage times of the ship is improved.

The utility model belongs to the field of fresh fish storage and transportation, and discloses a fresh fish storage and transportation device for a fishing boat, which comprises a storage component for storing fresh fish in running water, a moving component arranged at the top of the storage component and used for moving and driving the fresh fish, and a pollution discharge component mounted on the moving component and used for isolating the fresh fish and sucking dirt in water; the sewage discharging assembly comprises a sewage suction pipe, a sewage suction pump is installed at the front end of the sewage suction pipe, and a sewage discharging pipe is installed in front of the sewage suction pump. According to the fresh fish storage and transportation device for the fishing boat, dirt such as excrement in water in the storage and transportation box is sucked out through the arrangement of sucking the dirt in the water, the dirt in the water is reduced, and pollution of the dirt to the water quality is reduced; through the arrangement of a movable suction device, dirt scattered at all positions of the storage box is movably sucked while fresh fishes are driven, and the dirt cleaning effect is improved; through the arrangement of isolating fresh fishes, the dirt suction holes are separated from the fresh fishes, and the fresh fishes are prevented from being sucked by the dirt suction holes and being damaged.

The utility model discloses a remote control fishing boat which comprises a boat body, a line wheel assembly, a sensor assembly and a line lifting device, and the line wheel assembly is arranged on the boat body and used for winding and unwinding a fishing line; the sensor assembly is arranged on the ship body, the sensor assembly is provided with a triggering piece matched with the fishing line released by the line wheel assembly, and the sensor assembly can be triggered through the triggering piece when the fishing line released by the line wheel assembly is pulled; the wire lifting device is arranged on the ship body and electrically connected with the sensor assembly, the wire lifting device is provided with a pull rod capable of moving up and down, the pull rod is provided with a first through hole for a fishing wire to penetrate through, and the pull rod is provided with a first position and a second position located above the first position. The wire lifting device is configured to drive the pull rod to move from the first position to the second position when the sensor assembly is triggered so as to instantly tighten the fishing wire. According to the technical scheme, the remote control fishing boat can reduce the probability that the fishing line is knotted when the fishing line is taken up.

The net hauler comprises a base, the base is used for being fixed to a ship body, the net hauler further comprises a stand column sleeve, a first limiting bolt, a second limiting bolt and a butt joint column, the butt joint column is a cylindrical butt joint column, the butt joint column is arranged on the base, and a first ring groove and a second ring groove are formed in the butt joint column; the butt joint column is rotatably sleeved with the stand column sleeve, the first limiting bolt and the second limiting bolt are directly or indirectly arranged on the stand column sleeve, one end of the first limiting bolt is located in the first annular groove, one end of the second limiting bolt is located in the second annular groove, and the other end of the first limiting bolt is located in the second annular groove. The inner wall of the stand column sleeve is tightly attached to the wall face of the butt joint column. The net hauler has the following beneficial effects that the upright post sleeve can rotate relative to the ship body;

The invention discloses a fishing light complementation auxiliary device and a fishing light complementation system.The fishing light complementation auxiliary device comprises a guide rail assembly and a hull assembly, and the guide rail assembly comprises a hanging rod, a second support, a second rotating wheel, a steel rail and a rotating wheel support; the guide rail assembly is hung below a square matrix bracket of the floating photovoltaic square matrix assembly through the hanging rod; the ship body assembly comprises a cabin mechanism, a control mechanism, an impeller mechanism and a rail clamping mechanism; the rail clamping mechanism is arranged on the upper portion of the cabin mechanism and used for connecting steel rails of the guide rail assembly. The control mechanism comprises a power source; the impeller mechanism is arranged at the tail of the cabin mechanism and connected with the power source, when hollow blades are driven by the power source to rotate in air, the air enters from an inlet in the side face of the front side, and water is sprayed out from an outlet in the end of the outermost side, does centrifugal motion and is sprayed to square matrix assemblies on the surrounding cleaning square matrix assemblies, and meanwhile the ship body assembly is driven to move along steel rails. According to the auxiliary device, the photovoltaic cleaning effect and the oxygenation effect are improved at the same time.

A double-drive double-guide-column net drawing device for small and medium-sized fishing boats finishes the history that an existing fishing boat net drawing machine can only draw a net by winding a net rope on a driving roller, prolongs the service life of the net rope, does not have strict technical requirements on operators, and not only has the advantages of a net drawing device of an existing fishing boat net drawing machine, but also has a simple structure. When a fishing boat needs net drawing operation, a power source drives a power input shaft, a driving flexible belt, a plurality of rotating wheels and the like to form a net drawing traction mechanism of a double-drive double-guide-column small and medium-sized fishing boat net drawing device to work, then a net rope is put into the net, a moving frame is pushed through a rotating handle, and the net drawing traction mechanism is driven to rotate. And a driving wheel and a plurality of rotating wheels on the movable frame are transmitted to a flexible belt II to form reaction resistance on the net rope, so that physical phenomena such as wrapping, adsorption and friction of the flexible belt on the net rope are formed, acting force for pulling and pulling the net rope is formed, and the purpose of drawing the net is achieved.

An improved system for transferring and arranging tubs, in particular fish tubs in a fishing vessel, allows efficient filling of a cargo decks of varying size with filled tubs, and delivery of empty tubs from the cargo deck to an upper processing deck. A pair of lifts can accommodate a wide cargo deck, with e.g. four, five or six rows of stacked tubs. The system comprises cargo movers, one in each cargo lane of stacked tubs. The cargo storage area of the system is divided in at least a front cargo section and an aft cargo section. A transverse transfer lane with a respective carriage is arranged aft of each cargo section. In each cargo section there is at least one cargo lane with a cargo mover that moves stacks in the front direction and at least one cargo lane with a cargo mover that moves stacks in the rear direction. This way, tubs of fish or other cargo can be arranged and positioned essentially anywhere in the cargo area and empty tubs delivered to a processing deck.

The utility model discloses a gateway device for wireless Internet of Things operation of an ocean fishing vessel. Comprising a box body, a shipborne power supply input unit, an LED power supply switch unit, an RS485 serial unit, a communication unit, a control unit, a battery unit and a water-proof and salt-fog-proof unit, wherein the shipborne power supply input unit can receive 220V alternating current voltage and supply power to a fishing boat generator; the LED power supply switch unit can bear power supply input of a fish gathering lamp; the RS485 serial unit supports an RS485 serial port; the shipborne power supply input unit is electrically connected with the LED power supply switch unit; through the cooperation of the shipborne power supply input unit, the LED power supply switch unit, the communication unit, the control unit and the battery unit, the gateway device has the characteristic of wireless communication, the gateway device is installed on each fish gathering lamp, the fish gathering lamps can be effectively grouped and segmented and quickly lighted, the use amount of wires is reduced, the installation is convenient, and the cost is low. The instant pumping and unloading load of the fishing boat generator is reduced, and the purpose of light operation of the fishing boat is achieved.

The invention relates to the technical field of ship equipment, and discloses a culture cabin cover storage device of a culture ship, four first storage seats are arranged in a rectangular shape, a first bearing plane is arranged at the top of each first storage seat, and a first fixing eye plate is fixed on each first bearing plane; the first fixing eye plates of every two transversely adjacent first storage seats are oppositely arranged and connected through a first steel wire rope locking device, the second storage seats are arranged between every two adjacent first storage seats, two of the second storage seats are oppositely arranged in the transverse direction, and the other two second storage seats are oppositely arranged in the longitudinal direction. The top of each second storage seat is provided with a second bearing plane, the two sides of each second storage seat are provided with limiting columns respectively, the two limiting columns and the second bearing planes form limiting grooves, the tops of the limiting columns are provided with second fixing eye plates, and the second fixing eye plates of the two oppositely-arranged second storage seats are oppositely arranged and connected through a second steel wire rope locking device. The device can comprehensively and stably support and fix the culture hatch cover.

The invention relates to a quadruple sailing boat (1) for fish farming in open or ocean sea areas, comprising at least one base structure (2), at least one seine (5), at least one driving and accommodation compartment (3), at least one sail system (4) and at least one storage silo (6), all of which are modular and / or detachable. According to the invention, the at least one base structure (2) comprises: at least two main floats (7) which are parallel and spaced apart from each other and are connected or fastened to each other by means of at least one arm (8); and at least two secondary floating bodies (9) adjacent to each of the at least two main floating bodies (7), the perimeter of the secondary floating bodies being smaller than the perimeter of the at least two main floating bodies (7), and the two secondary floating bodies being arranged parallel to each outboard and at a distance from the at least two main floating bodies.

A control system for a towed object (1, 6, 20, 30, 50) in or on a body of water comprises one or more towing members (3) extending between the object (1) and a towing vessel (2). One or more ballast members (4) are movably connected to respective ones of the one or more towing members (3) and are controllably movable at least a distance along their respective towing members. The towed object (1) is controllable by moving the one or more ballast members (4) on the towing members (3) to control a catenary (c) of the towing members (3). Each ballast member (4) may be individually manipulated to correct, preserve, or otherwise change the geometry of the trawl.

A system for transferring and arranging cargo tubs (80) and a device (30) for horizontal translational movement of one or more cargo tubs (80) or stacks of stackable cargo tubs (80)on a cargo storage surface such as in a lane of a system of parallel lanes. The device (30) is suitable for tubs (80) that have pallet-like runners arranged on the bottom of the tubs (80). The device (30) comprises a longitudinal moving assembly with at least one first pair of joined transversely extending fingers (31, 31'), the fingers (31, 31') configured to pivot out in opposite directions to an extended position as the moving assembly moves in its transfer direction, such that the fingers (31, 31') can engage with a cargo tub (80) aligned on top of the device (30) and move the tub (80) in a transfer direction of the device (30). The device (30) preferably has a pair of rear fingers (33, 33') configured so that when the moving assembly of the device (30) is in an aft position with its rear end extending in the aft direction, the rear fingers (33, 33') can engage with openings in the runners of a tub (80) aft of and aligned with the device (30) to pull that tub (30) in the transfer direction of the device into a lane of the device (30).

The utility model relates to the field of fishing boats, in particular to an energy-saving living cabin for a fishing boat, which comprises a cabin arranged in a boat body, a plurality of portholes are arranged on two opposite sides of the cabin, a first cabin door and a second cabin door are arranged on the other two opposite sides of the cabin, and a living cabin and a power cabin are arranged in the cabin. The living cabin is used for daily living of sailors, and a power assembly used for driving the ship body to move is arranged in the power cabin; wherein one side of the top of the cabin is provided with a power generation assembly electrically connected with the power assembly, the other side of the top of the cabin is provided with a rainwater collecting assembly used for collecting rainwater, a photovoltaic panel and a storage battery connected with the photovoltaic panel, and energy needed by movement of the living cabin, equipment in the power cabin and the ship body can be provided; on one hand, the collected rainwater can be filtered by the water collecting cover and the activated carbon plate to prevent dust or weed and leaf pollution, and on the other hand, the collected rainwater can be used as flushing water and cooling water.

To provide a comfortable environment for drift fishing.SOLUTION: A pair of right and left resistance plate units 90L and 90R which can be individually driven are arranged at the stem. The magnitude of the resistance that the resistance plates 93 of the resistance plate units 90L and 90R receive from the water is a first magnitude at the first position (90°) and is a second magnitude smaller than the first magnitude at the second position (0°). The resistance plate 93 is controlled based on the wind speed WS and the absolute tidal current speed TV1.SELECTED DRAWING: Figure 4

This invention provides a refrigeration system for fishing vessels that simplifies the configuration and reduces installation space, even when using refrigerants such as ammonia. [Solution] The system comprises multiple oil-cooled single-stage screw compressors 4-6, a first fish hold 2 cooled by the multiple oil-cooled single-stage screw compressors 4-6, and at least one second fish hold 3. The first fish hold 2 and the second fish hold 3 each have different cooling temperature ranges. The first fish hold 2 is cooled by operating each of the multiple oil-cooled single-stage screw compressors 4-6 in parallel in a single-stage compression system, while the second fish hold 3 is cooled by operating the multiple oil-cooled single-stage screw compressors 4-6 in series, combining them as the lower and upper stages of a two-stage compression system.

The present invention relates to a set of self-floating cage rafts formed by individual cage rafts that is useful in aquaculture comprising multiple tubes made of high-strength plastic, such as HDPE or the like, which allow the tubes to float without the need to incorporate additional floatation means as in traditional cage rafts. The invention comprises corner and passageway attachment elements based on a set of plastic tubes used in a square cage raft for fish farming, forming a continuous passageway along the length and width of the entire extension of a set of cage rafts. The aisles formed are in turn a transit platform for the operators working on the rafts. The raft comprises attachment elements consisting of brackets or connectors that support the tube attachments both at the perimeter corners and the central corners, forming the continuous aisle. Furthermore, the invention comprises connectors for tube segments and has means for forming a railing or handrail on the raft passageways.