155 results about "Cage aquaculture" patented technology

The invention discloses a deepwater aquaculture net cage using wave energy. The deepwater aquaculture net cage using the wave energy comprises a net cage (4), an anchor chain (2) and a foundation pillar (1). One end of the anchor chain (2) is connected with the net cage (3), the other end of the anchor chain (2) is connected with the foundation pillar (1), and the foundation pillar (1) is fixedly installed on the seabed. The deepwater aquaculture net cage using the wave energy further comprises an automatic feeding system, an automatic subsiding system, a remote monitoring system and an ocean power generation system using wave energy. The ocean power generation system is installed on the periphery of the frame of the net cage, the automatic subsiding system is installed on the upper layer frame of the net cage (4), the automatic feeding system is installed on the middle portion of the top portion of the net cage (4), one terminal of the remote monitoring system is installed on the net cage (4) under water, the other terminal is installed on a controller on shore, and two terminals are connected through a general packet radio service (GPRS) network. And therefore, the electric energy generated through the wave energy supplies energy needed by each system in a deepwater cage aquaculture process.

The present invention relates to an ecological cage culture method of finless eel, including lotus rhizome, finless eel, interval culture and using engineering fly-maggot as feed. Said invention provides a good culture environment for grwoth of finless eel, use high-quality high protein engineering fly-maggot as feed so as to can greatly raise finless eel culture density, can shorten feeding period, and its yield can be raised by 50-100%.

The invention discloses a system for mechanically pumping the excreta of fish bodies in a feeding cage, which comprises at least one aquaculture net cage, and a floating device and a fish excreta collector which are arranged corresponding to the aquaculture net cage, wherein the floating device is fixed and suspended on water by a mounting bracket at the top of the aquaculture net cage; the aquaculture net cage and the fish excreta collector are connected with the floating device respectively; an excreta collection barrel is arranged at the bottom of the fish excreta collector, and is connected with an excreta pumping machine by an excreta pumping pipe; and the fish excreta collector is provided with a vibrating retaining ring which is connected with a vibrating rope. The system can perform excreta pumping processing on a plurality of groups of aquaculture net cages by utilizing only one excreta pumping machine, and has the characteristics of high excreta pumping efficiency, cost reduction, higher pumping mechanization and automation degree, convenience for the maintenance of the excreta pumping machine, more rational aquaculture structure due to the combination of an inner aquaculture cage and an outer aquaculture cage, and higher environmental friendliness of cage aquaculture and healthier and more scientific aquaculture due to the organic separation of the aquaculture net cage and the fish excreta collector.

The invention relates to the technical field of fishery culture, in particular to a sturgeon deep water net cage culture device. The device aims at solving the problems that a requirement on a growth temperature range in a sturgeon culture process is high, an over-summer survival rate particularly in China south lake and pond culture is low, and a feed coefficient of the existing net cage culture is high. The device comprises a net cage, and is characterized in that a net drawing device is arranged at the top of the net cage; one end of the net drawing device is fixed on a floating mat; a middle strand is arranged on the net cage; a steel plummet ring is arranged at the bottom of the net cage; and a meal table is arranged at the bottom of the net cage. The device can detect temperature automatically, meets requirements on sturgeon growth temperature in different seasons, particularly in a summer; the net cage is convenient and easy to clean and wash; feed is directly fed at the meal table at the bottom of the net cage, which is suitable for the characteristics of demersal fish and lower mouth of a sturgeon; and an entire water tank is good in stability in water.

The invention relates to a bait casting machine for net cage aquaculture. The bait casting machine for net cage aquaculture comprises a feed box, a buoyancy mechanism, a bait casting disc, a bait casting motor, a time relay and a frequency conversion controller; a conical flow guide platform bulging outward is arranged in the center of the bottom face of the feed box, and a flow guide plate which is correspondingly inclined is arranged at the periphery of the bottom face of the feed box; multiple arc-shaped discharge holes are evenly formed in an annular area between the flow guide plate and the flow guide platform; the bait casting disc is fixedly arranged below the discharge holes, and bait evenly falls onto the bait casting disc in multiple directions through the discharge holes; the bait casting disc is driven by the bait casting motor to rotate, and the bait falling on the bait casting disc is cast into a surrounding water body; the frequency conversion controller of the bait casting motor controls the rotating speed, thereby the casting distance is controlled, and the time relay controls starting and the duration time of the bait casting motor; the distance between each discharge hole and the upper end of a corresponding blade of the bait casting disc is 5-40 mm, when the bait casting disc does not rotate, the bait is warded off by the bait casting disc, no bait is dropped out of the feed box, and when the bait casting disc rotates, the bait is dropped out of the feed box continuously.

The invention discloses a seawater net cage aquaculture method for stichopus japonicus. The seawater net cage aquaculture method comprises the steps of selection of an aquaculture sea area, net cage arrangement, stichopus japonicus fry feeding and aquaculture management. In the selection of the aquaculture sea area, the sea area is required to be 1,000-2,000m off the shore, is high in water quality, does not have a red tide and is rich in natural organic baits; in the net cage arrangement, a net cage rack consists of wood boards and floaters, and 4-8 rows of net cage racks are arranged in the sea in the tide direction; 20-50 net cages are connected in each row; in the stichopus japonicus fry feeding, the specification of selected fries is 60-80 pieces per kilogram, and the density of the fed fries is 4.5-5.0 kilograms per cage; healthy stichopus japonicus fries are selected; the aquaculture management comprises four steps of feeding baits, preventing harmful organisms, cleaning impurities and setting a warning device. The seawater net cage aquaculture method is convenient to use; by net cage aquaculture, the possibility that the stichopus japonicus is injured can be reduced, the survival rate of the stichopus japonicus is increased, the yield of the stichopus japonicus is improved, and the demand of the market can be met.

The invention discloses a comprehensive multi-trophic-level marine cage aquaculture system device and an aquaculture method. An annular peripheral float floats on the sea surface, and a fish aquaculture cage is fixedly arranged at the lower inner edge of the annular peripheral float. A loading plate is horizontally suspended below the fish aquaculture cage and provided with pulling rope through holes. A sea cucumber aquaculture tank is put on the loading plate, and a plurality of independent sea cucumber aquaculture cages are arranged in the sea cucumber aquaculture tank. Upper ends of the pulling ropes are fixed to the peripheral float, middles of the pulling ropes are tied to the sea cucumber aquaculture tank, and lower ends of the pulling ropes movably penetrate the pulling rope through holes to be fixed to a first sinker. A plurality of anchor ropes for fixing the peripheral float at a set position are arranged on the peripheral float and provided with floaters, and partition plates are movably inserted in abalone aquaculture cages which are suspended on the anchor ropes. By reasonable matching and cyclic mutualism of co-cultured organisms in different trophic levels, negative effects caused by pollution problems of traditional marine aquaculture industry are alleviated, and the problem of pollution caused by a single mode in cage aquaculture is solved.

The invention discloses a double-body movable culture work ship. The ship is characterized by comprising a first ship body, a second ship body and a plurality of lifting net cages, wherein the first ship body and the second ship body are oppositely arranged at the side faces of the ship and used for providing main buoyancy, and the lifting net cages are arranged between the first ship body and thesecond ship body and connected with the two ship bodies; and closed circulating water industrial aquaculture of small-size fishes is carried out in the two ship bodies, and wild aquaculture of large-size adult fishes is carried out in the lifting type net cages in a relaying manner. According to the ship, the advantages of a closed culture mode and an open culture mode are organically integrated,and offshore wild culture from the small fries to the adult fishes is achieved. Compared with open type net cage culture, marine culture can be started from the small-specification fish fries, the pressure of land or near-shore net cage culture on the environment is reduced, and meanwhile the marine transportation cost of large-specification fishes is reduced; and compared with full-closed type culture, the ship has the advantages that low-density open type wild culture is adopted in later-stage culture, and the quality and selling price of bred fishes are higher.

The invention discloses a self-propelled self-elevating mariculture ship and an operation method thereof, and relates to the field of ocean engineering equipment design. The self-propelled self-elevating mariculture ship is characterized in that net cages are connected with a hull through net racks, and lifting and fixing of the net cages are achieved by using a net cage lifting and locking system. In the culture state, the culture ship hull is supported at a certain height above the water surface through multiple pile legs, the hull is prevented from being directly acted by wave current loads, and shaking of the hull is reduced; after culture is finished or when typhoon needs to be avoided, the hull is lowered to a floating state through a lifting system, the pile legs are folded, and moving navigation is achieved through a propelling and steering system; compared with a floating type culture ship, corrosion caused by the fact that the hull floats in seawater can be relieved, fatiguedamage of the hull structure under the long-term action of wave flow is avoided, and hull shaking is small; the self-propelled self-elevating mariculture ship has the self-propelled characteristic, and the maneuverability of net cage culture is greatly improved; and the net cages can be prevented from bearing huge wave force on the water surface, shaking of net cage systems is reduced, and the structural safety of the net cage systems is improved.

The invention relates to the technical field of aquaculture and technology for raising a precious marine product of abalones, in particular to a method and a device for raising abalones by open-type net cages. By the method and the device, a new mode for raising abalones in southern and northern provinces is realized, and a high-efficient environment-friendly mode for raising abalone-kelp integrated culture is formed. Compared with the conventional suspension cage culture, the small open-type net cage culture has smoother water flow and is more convenient to operate, particularly the phenomenon that the abalones are dehydrated due to lifting feed is avoided, so that the survival and the growth of abalones are benefitted. The raising capacity of one small net cage is close to 20 times that of one suspension cage; and simultaneously, because the small net cage culture is open, pollution to marine environment is avoided, and the device and the method accord with the ecological idea of sea ranching.

The invention discloses a technical method for breeding hirudo in pond net cages, which relates to the technical field of aquiculture, and comprises the steps: pond conditions and water requirements, making and setting of net cages, stocking of leech species, bait feeding, daily management and disease prevention. The technical method for breeding hirudo in the pond net cages has the beneficial effects that the technical method for breeding hirudo in the pond net cages fully utilize production resources, does not need professional equipment, does not have breeding pollution, is standard and normative in cultivating technology and science and standard in feeding, is suitable for breeding in large area ponds, is also suitable for small area breeding around every houses, is large in extended significance in the condition that the culture benefits are lower, and is excellent in prospect.

The invention discloses an underwater multifunctional feeding device for ocean net cage culture. The underwater multifunctional feeding device is suitable for multifunctional underwater feeding of a full-floating net cage, a semi-submersible net cage and a bottom-sitting net cage. The device comprises a cyclone vortex mixer, seawater pipelines, a main feeding pipeline and feedstuff feeding manifolds, wherein the cyclone vortex mixer comprises an air-assisted feed dispersing bin and a seawater turbine bin; the seawater turbine bin comprises a plurality of seawater inlets and a vortex guide plate, and the bottom of the vortex guide plate is connected with the main feeding pipeline; the upper end of each seawater pipeline communicates with the corresponding seawater inlet, and the lower end of each seawater pipeline is connected with a seawater submersible pump immersed in seawater, so that seawater is pumped into the seawater turbine bin to form a vortex rotating downwards, and feed is driven to enter the main feeding pipeline; and the multiple feedstuff feeding manifolds are arranged at the lower end of the main feeding pipeline, so that the feed in the main feeding pipeline can befed into an aquaculture water space in a multi-point mode through the feedstuff feeding manifolds.

The invention particularly relates to a cage culturing method of inimicus japonicus, which comprises the following steps of: (A) the cultivation of inimicus japonicus fingerlings: selecting artificially cultured inimicus japonicus fish fries, taking live opossum shrimps as baits in cages of a sea area, followed by acclimatizing the inimicus japonicus fish fries through the baits, and breeding the inimicus japonicus fish fries to be inimicus japonicus fingerlings for cultivation; and (B) cultivation and management of the inimicus japonicus: cultivating cultivated inimicus japonicus fingerlings to be inimicus japonicus commercial fishes through feeding chilled miscellaneous fish and shrimp baits in the cages of the sea area. The method is simple and convenient and is easy to learn; the survival rate of fingerlings after the bait acclimatization is finished is 73.3%; the average weight of the fingerlings is 1.82g; the survival rate of the inimicus japonicus commercial fish is 35.8%; the average weight of the inimicus japonicus commercial fish is 205g; the weight of the heaviest inimicus japonicus commercial fish is 26g; and the cultivated commercial fishes have a higher economic value.

The invention discloses a fishery net cage culture structure based on an offshore wind power multi-pile bearing platform foundation. The offshore wind power multi-pile bearing platform foundation comprises a fan, a multi-pile bearing platform foundation body and pile legs. The fishery net cage culture structure comprises inner fishing nets and outer fishing nets which are arranged on the inner sides and the outer sides of the pile legs in the mainstream tidal current direction respectively, and inner fishing nets arranged on the inner sides of the pile legs in non-mainstream tidal current direction. The fishery net cage culture structure provided by the invention can effectively reduce the flow velocity, the nets are firmer, and the service life of the structure is prolonged.

The invention belongs to the technical field of net cage aquaculture and relates to an aquaculture net cage. The aquaculture net cage comprises an upper supporting floating frame and a lower supporting frame fixed to a seabed, and a plurality of cylindrical outer shells are arranged between the upper supporting floating frame and the lower supporting frame and internally provided with telescopic parts capable of sliding up and down. Upper ends of the telescopic parts extend out of tops of the cylindrical outer shells to be hinged to the upper supporting floating frame while lower ends are slidably arranged in the cylindrical outer shells. A bait recovery net is arranged at the bottom of the aquaculture net cage and connected to the cylindrical outer shells through rods, and one end of eachrod penetrates a corresponding through groove in the corresponding cylindrical outer shell to be fixedly connected to a transmission mechanism below the corresponding telescopic part while the otherend is hinged to a cage body in the aquaculture net cage. The telescopic parts which slide up and down drive a bait collection mechanism to perform synchronous reverse motion through the transmissionmechanisms. The aquaculture net cage has the advantage that bait at the bottom of the aquaculture net cage can be collected and reused.

The invention discloses a method for cage cultivation of myriophyllum spicatum and belongs to the fields of water environmental protection and water ecological reconstruction. The myriophyllum spicatum is planted in a suspension cage and light requirements in water can be met through adjustment of suspension depth. The suspension cage comprises floating bodies and a cage which are connected through ropes. The method includes the steps: arranging the suspension cage in a water body with water depth exceeding 1.5 meters; inoculating the myriophyllum spicatum starting from March each year; breeding plagiognathops microlepis or silver todarades in the cage; monthly measuring change of water transparency from April to October each year and adjusting the suspension depth according to the water transparency; harvesting the myriophyllum spicatum during October and November each year. By the method, the myriophyllum spicatum can fixedly grow on a bottom substrate of the cage, the myriophyllum spicatum can be prevented from being chewed and eaten by herbivorous fishes, infringement of stormy waves upon plants can be resisted, and an introducing problem of the myriophyllum spicatum is solved.

The invention discloses a self-elevating multifunctional ocean platform and an operation method thereof. The self-elevating multifunctional ocean platform comprises a platform main body, pile legs, aplatform lifting system, a net cage culture device, a net cage lifting system, a solar power generation device and a wind power generation device, wherein the platform main body is supported at a specified height above the sea surface through the lifting platform lifting system and the pile legs, and a net cage area, a leisure area and a living area are arranged on the platform main body; and thenet cage area is provided with the self-lifting net cage culture device, the solar power generation device is located at the top ends of the leisure area and the living area, and the wind power generation device is located at the top of the platform lifting system. The ocean platform can have the composite functions of high-end fishery seedling cultivation, marine ranch guarding and guarding, marine leisure sightseeing, marine environment monitoring, marine wind energy and solar energy comprehensive utilization and the like, the offshore fishery cultivation technology can be improved, and efficient resource utilization and economic benefits can be achieved.

The invention provides a combined wave-resisting net cage group. The combined wave-resisting net cage group comprises a square net cage group composed of four independent net cages, the adjacent net cages are connected through floaters, and the middle portions of two floaters over against each other are connected with a fixing device used for fixing the net cage group to the seabed through cables; each independent net cage comprises a floating pipe frame, a handrail pipe, a net bag and a net frame, wherein the floating pipe frame is composed of two semicircular frame bodies, and a floating cavity is formed in each frame body and internally divided into multiple air cavities through multiple partition plates; each floater is provided with two floating rods arranged in parallel, the two floating rods are sleeved with two buoys at the same time, and ball rings matched with the floating rods are arranged on each buoy. The four independent net cages are connected into the square net cage group through the floaters, buoys on the floating frames make the square net cage group float on the water surface, so that the square net cage group has the capacity for resisting waves, the service life of the independent net cages (1) is prolonged, and safety of net cage aquaculture is improved.

The present invention discloses a deep sea cage aquaculture net cage HDPE pipe material and a preparation method thereof. The HDPE pipe material is divided into inner and outer layers, the inner layer consists of the following raw materials in parts by mass: 100 parts of PE100 pipe resin, and 3-5 parts of a toughening agent; the outer layer is composed of the following parts of the raw materials by mass: 100 parts of ultrahigh molecular weight polyethylene, 10-20 parts of POE, 1-10 parts of polyethylene wax, 5-8 parts of carbon black, 2-10 parts of an ultraviolet absorber, 2-10 parts of a light stabilizer and 1-10 parts of an antioxidant. The thickness ratio of the inner and outer layers is 5-10: 1. The HDPE double-layer pipe material is used in a deep sea cage aquaculture net cage system, the frame impact resistance is improved, the wall thickness of the pipe material can be reduced, cost can be effectively reduced, net cage buoyancy is increased, mechanical properties of the pipe material can be maintained, and are not reduced, under the long sea water soaking and sun exposure, and the breeding of marine organisms in the pipe surface can be prevented.

A method of freshwater aquaculture of Litopenaeus vannamei in a net cage includes an early-stage preparation step of net-cage aquaculture, a water quality and salinity detection and preparation step before shrimp seeds are placed into the net cage, a shrimp seed feeding step for the net cage, a separative aquaculture step, a culture period management step and a harvesting step. The early-stage preparation step includes A, selecting a proper aquaculture water area; B, setting the net cage; C, placing the net cage into the water one month before the shrimp seeds are fed. The separative aquaculture step includes separating and transferring the shrimp seeds three times in the 20th day, the 40th day and the 60th day, reducing the density and prompting growth of the shrimp seeds. The culture period management step includes daily management and prevention and control of shrimp diseases. The method of freshwater aquaculture of the Litopenaeus vannamei has the advantages that a good well-off way is provided for efficient special aquaculture of various inland lakes and reservoir areas; temporary-rearing desalination formula of ultralow salinity smaller than or equal to 0.5%o; the net cage applicable to freshwater aquaculture of the Litopenaeus vannamei is modified; aquaculture quality of the Litopenaeus vannamei by the net cage is better; benefits of the Litopenaeus vannamei cultured in the net cage are considerable.

The invention provides an indoor cement-pool artificial breeding method for oplegnathus punctatus. The method comprises the following steps: (1) water-quality regulation and control: before hatched fish larvae are put, adding an EM probiotic preparation and natural alga cultivating pool water into a pool in each day; (2) pool entry: before the hatched fish larvae are put, distributing air stone ina transverse H manner, and putting the fish larvae in the pool, wherein the putting density is 13000-15000 fish larvae per cubic meter; (3) feeding management: feeding the fish larvae which are 20-40days old with baits including copepods and living mysis, and feeding the fish larvae which are over 30 days old with microencapsulated opening baits; (4) water change and illumination management: after the fish larvae are fed for 30-49 days, replacing water with 100%-150% of filtered seawater, and carrying out indoor illumination on the fish larvae which are 20-35 days old at 2500x-30001x, so asto realize light induced food intake; and (5) larvae outputting: transferring the larvae into a maritime net cage for breeding. According to the indoor cement-pool artificial breeding method, the growth quality of the fish larvae is improved, the death rate of the fish larvae is decreased, stress reaction of the fish larvae on a net cage breeding environment is reduced, and the survival rate of adult fish is increased.

The invention provides a seriola aureovittata sea-land relay breeding method, and belongs to the technical field of sea water aquiculture. The method comprises the steps of deep sea anti-stormy wave net cage aquaculture, sea-land relay transport and land-based industrialized circulating water system overwintering conservation. The method provided by the invention carries out seriola aureovittata breeding by mainly using the relay breeding mode of a deep sea anti-stormy wave net cage and a land-based industrialized circulating water system, effectively solves the problem of stress-induced deathof the cultured fish in the sea-land relay transportation process, realizes the annual growth and rapid marketing of seriola aureovittata, and achieves the purpose of regulating and controlling the muscle quality of the cultured commercial fish through adjusting the bait combination and feeding strategies at the same time.

Feed for channel catfish adults comprises, by weight, 2-4 parts of Bacillus subtilis powder, 1-4 parts of ferment bacteria, 0.5-0.9 part of solid photosynthetic bacteria, 0.8-1.2 parts of bdellovibrio bacteriovorus, 0.2-0.6 part of vitamin additive, 10-16 parts of mineral additive, 0.2-0.4 part of chelating agent, 60-80 parts of water hyacinth, 50-80 parts of edible fungi residue, 100-110 parts of distillers' grains, 40-60 parts of fishbone meal, 70-80 parts of rice bran, 10-16 parts of brown sugar, 45-55 parts of kongpo monkshood root, 40-50 parts of Cochinchina Momordica seed, 1-15 parts of Chinese stellera root and the like. Comparisons show that compound microorganism feed with the feed can help channel catfish adults to grow fast, with higher EPA content and less fish diseases, less fishes die of illness, the beneficial microorganisms in water can be more, and final quality is higher.

The invention discloses a floating trawl cage fish culture cage in the Yellow River riverway, comprising a floating trawl cage 1, a trawl cage operating platform buoy 2, a trawl cage balance traction buoy 3, a trawl cage mongline oil silk cable 4, a trawl cage locating device 5, a trawl cage pollutant blocking device 6, an embankment fixing anchor block 7 and a framework 11. The invention has the beneficial effects of solving the trawl cage culture technology of the Yellow River carp under wild environment, solving the difficult problem of Yellow River flowing water culture and increasing the culture method of special Yellow River fish. The invention utilizes a flexible force transmission device and a composite trawl cage design to solve the shortage that the common trawl cage can not adapt to the Yellow River, and is a novel fish culture floating trawl cage.

The invention provides an intelligent net cage fish culture monitoring system which is controlled by an upper computer and a lower computer, the upper computer is a system remote monitoring computer,a visual programming language design interface is adopted, and remote monitoring and management operation on a net cage are achieved. The lower computer is composed of a sensor part, a remote measurement and control terminal and an execution mechanism. The remote measurement and control terminal is used for acquiring, transmitting and storing net cage culture environment parameters and controllingthe execution mechanism; the sensor part realizes real-time acquisition, processing and display of net cage environment and fish shoal response data; the execution mechanism adjusts the environment of the net cage and feeds baits, transmits monitored environment parameters to the upper PC through a bus network and a wireless communication module, receives control of the upper PC to generate a control decision, and controls the execution mechanism to conduct adjustment. In the aspect of aquaculture related parameter monitoring, a more comprehensive and more scientific intelligent fishery system can be built for multiple environmental factors at the same time.

The invention relates to a fish gathering device for cage culture. The fish gathering device comprises a support frame, wherein at least four clamping devices corresponding to the position of cage floating tubes are fixedly arranged below thee support frame; a power device, a rotary drum and a guide roller are fixedly arranged above the support frame; the rotary drum is parallel to the guide roller; the powder device drives the rotary drum to rotate; one end of a lifting rope is fixed to a stranded cable rotary drum, and the other end of the lifting rope downwards winds around the guide roller, is pulled by a cage bottom, winds around an opposite cage handle tube and then is fixed to the cage main floating tube; and the lifting rope is also fixedly connected with a center axis part of thecage bottom. The fish gathering device can be directly mounted and matched with an existing culture cage and can be flexibly, reliably and symmetrically arranged on the cage through skillful assemblywith the cage, transformation of the existing cage arrangement is not needed, a net lifting rotary drum is used to wind and collect a steel rope and lift netting, so that fishes cultured in the cage are gathered, manual or mechanical catching is facilitated, and the cage catching efficiency is improved.

The invention relates to an analysis method for calculating hydrodynamic characteristics of a submerged net cage. The analysis method comprises the following steps: determining overall modeling parameters of a submerged net cage structure; dividing grids; simulating a netting unit; determining constraint conditions; carrying out wave current load calculation; and carrying out dynamic analysis on the submerged net cage structure at different diving depths. The analysis method can be used for ensuring the safety and the stability of the submerged net cage culture facility.

The invention relates to an aquaculture cage underwater cleaning device. The aquaculture cage underwater cleaning device comprises a rotation shaft provided with a center blind hole, a shaft sleeve and a cleaning disc. The rotation shaft is provided with at least one water inlet communicating with the center blind hole in the radial direction. The shaft sleeve is fixedly arranged at the outer portion of the rotation shaft. The position, corresponding to the water inlet, of the inner wall of the shaft sleeve is provided with a circle of ring groove, the side wall of the shaft sleeve is providedwith a water inlet hole communicating with the ring groove, and the water inlet hole is connected with an immersible pump. A plurality of branch pipes are evenly arranged on the cleaning disc, and the tail ends of the branch pipes are connected with nozzles. The horizontal included angle is formed between the water outlet direction of the nozzles and the end face of the cleaning disc, and water sprayed to the cage generates the rotation reverse acting force on the cleaning disc. The aquaculture cage underwater cleaning device is simple in structure and convenient to operate, the cage aquaculture environment is guaranteed, and the aquaculture variety quality is improved; and the nozzles are obliquely arranged, the reverse acting force of the sprayed water flow is utilized for driving the cleaning disc to rotate, design is ingenious, the cleaning effect is good, the cleaning efficiency is high, and the automation degree is high.

The invention provides a preparation method of a cylindrical box body with the antifouling property for a deep and open sea net cage. The method comprises the following steps of A, preparing an antifouling netting, which comprises three aspects of preparing a modified high-density polyethylene composite material, preparing an antifouling monofilament bundle and processing the antifouling netting;B, preparing an anti-abrasion netting from a polyamide netting coated with a polyurea coating; and C, preparing the cylindrical box body, which comprises three aspects of side net processing, bottom net processing and cylindrical box body processing. According to the cylindrical box body with the antifouling property for the deep and open sea net cage obtained by the preparation method, the antifouling property of the cylindrical box body can be greatly improved and the water resistance of the cylindrical box body and the attachment area of fouling organisms can be reduced on the premise of keeping the netting strength of a side net unchanged, fouling organism attachment of the cylindrical box body and net breaking fish escape accidents under severe sea conditions can be greatly reduced, and green development and modern construction of the deep and open sea net cage culture industry are realized.

The invention discloses a flow dividing rotary disc for cleaning equipment of net clothing in deep water net cage and a graded rotation speed regulating method thereof. From the first step to the third step, the flow dividing rotary disc can be stably auto-rotated under rotation speed being close to stable rotation speed omega of a predetermined target, the phenomenon that graded rotation speed control of the flow dividing rotary disc can be achieved more accurately under the condition of constant high-pressure water-supply water pressure and no need of additional auxiliary speed regulation mechanism is realized, and thus, appropriate target stable rotation speed omega can be set based on net cage culturing fouling organism attachment types of the net clothing required to be cleaned in the deep water net cage, the best rotation speed of the flow dividing rotary disc is configured when the net clothing is cleaned, and improvement of the cleaning efficiency of the net clothing in the deep water net cage and the removal ratios of the fouling organisms is realized. According to the flow dividing rotary disc disclosed by the invention, the flow dividing rotary disc is stably auto-rotated under rotation speed being close to stable rotation speed omega of the predetermined target while the rotation smoothness of the flow dividing rotary disc can be ensured at the same time, and the cleaning efficiency of the net clothing in the deep water net cage and the removal ratios of the fouling organisms are improved.