Oyster cultivation method

Abstract

The present invention relates to an oyster cultivation method, comprising: S10, constructing a floating raft body in a cultivation sea area; S20, constructing a cage frame, wherein the cage frame includes a frame, wherein the frame includes a plurality of support tubes arranged at intervals, and at least two floats are arranged below the frame; S30, fixing a plurality of oyster seed strings and / or oyster cages containing oysters to the cage frame at intervals through cables; S40, dropping the cage frame into the floating raft body through a crane arm; S50, at regular intervals, sequentially lifting the cage frame out of the floating raft body through the crane arm, and washing the cage frame and the oyster cages fixed on the cage frame, after which the oyster growth status is observed, and the cage frame is returned to the floating raft body. In the oyster cultivation method of the present invention, the cage frame can be lifted out of the sea surface or connected to the floating raft body by the crane arm of the workboat, which facilitates regular cleaning of attachments on the cage frame and the oyster cage, inspection of the growth status of the oysters, and timely detection and treatment of diseases and insect pests, thereby reducing the mortality rate of oysters and increasing the yield of oysters.

Description

Technical Field

[0001] The present invention relates to the technical field of aquaculture, and in particular to an oyster cultivation method and a fish-oyster polyculture method. Background Art

[0002] Oysters, also known as oysters, are the world's largest farmed shellfish and a vital marine resource for human consumption, with a global distribution. Oysters are a highly nutritious seafood delicacy with unique health benefits and medicinal properties, making them a highly nutritious seafood delicacy and a key target for marine aquaculture worldwide.

[0003] At present, the main method of oyster farming at sea is to use floating rafts (floating rafts). This method uses PE floats, inflatable floats or foam floats as floating objects, and uses bamboo and wood floating rafts to hang oysters in bunches. However, PE floats, inflatable floats and foam floats are prone to aging and damage during use, thereby releasing microplastics into the ocean and causing long-term pollution to the marine ecological environment. Bamboo and wood materials are prone to cracking and breaking under long-term immersion in seawater and exposure to sunlight, causing damage to the farming frame and causing economic losses to farmers.

[0004] In recent years, due to the continued expansion of oyster aquaculture, limited coastal shallow waters have made it difficult for plankton to meet the demand for oyster seedlings. Oyster aquaculture has begun to move towards deep-sea aquaculture. Coastal areas are prone to strong winds and waves, making floating rafts vulnerable to the impact of typhoon-induced waves and underwater undercurrents, which can cause them to break apart. Once a raft breaks apart, the oysters hanging from its bottom are lost to the sea, resulting in huge losses for farmers.

[0005] Furthermore, existing oyster farming methods typically require farmers to work on the sea surface, attaching and removing oyster cages one by one from floating rafts. This results in low efficiency and is easily affected by weather. While sunny days are relatively safe, the high temperatures can make farmers prone to heatstroke if they spend extended periods at sea. Furthermore, rainy days or typhoons can create high winds and waves, making operations dangerous and impossible. Therefore, there is a need to develop efficient and practical oyster farming technologies and models to reduce farmers' workload and improve the economic benefits of oyster farming. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and provide an oyster cultivation method.

[0007] The present invention is achieved through the following technical solutions: A method for oyster cultivation, comprising the following steps:

[0008] S10. Constructing a floating raft body in the aquaculture sea area, with the width direction of the floating raft body arranged in the direction of the current, the floating raft body comprising a plurality of floating raft units arranged in a rectangular array, and a plurality of anchor piles evenly arranged on the seabed on both sides of the width direction of the floating raft body, and connected to the width direction of the floating raft body by cables and / or anchor chains to secure the floating raft body;

[0009] S20, constructing a cage, wherein the cage includes a frame, the frame includes a frame body and a plurality of support tubes spaced apart on the frame body, and at least two floats are disposed below the frame body;

[0010] S30, fixing a plurality of oyster seed strings and / or oyster cages filled with oysters to the frame body and / or support tubes of the cage rack at intervals by cables;

[0011] S40, placing the cages into the floating row body by means of a crane arm for oyster cultivation: each cage is placed on two adjacent floating row units, with two ends of the cage connected to two ends of the two adjacent floating row units respectively; or, placing at least one cage in each floating row unit, with the cage being detachably connected to the floating row unit;

[0012] S50. Management during the culture period: At regular intervals, the cages in the floating rack body are lifted out in sequence by the crane arm, and the cages and the oyster cages fixed on the cages are rinsed. After the rinsing is completed, the growth status of the oysters is observed, and the cages are placed back into the floating rack body.

[0013] Compared with the existing technology, the oyster farming method provided by the present invention fixes the oyster cage on a cage frame that is detachably connected to the floating raft body. The farmer can lift the cage frame out of the sea or connect it to the floating raft body through the crane arm of the work boat, and can fix or separate the oyster cage from the cage frame on the work boat or on the shore, thereby facilitating the farmer's operation. Combining the cage frame with the floating raft can be used for oyster farming. The cage frame can provide a more stable growth environment for oysters, reduce the influence of natural factors such as wind and waves, and is conducive to the growth of oysters. It is also conducive to the refined management of oysters. The cage frame can be quickly separated from the floating raft, which facilitates the regular cleaning of attachments on the cage frame and oyster cage to prevent attachments from affecting the oysters' feeding. During cleaning, the growth of oysters can also be checked, so that problems such as pests and diseases can be discovered and dealt with in a timely manner, thereby reducing the mortality rate of oysters and increasing the yield of oysters.

[0014] Furthermore, the floating raft body includes a truss and connecting pipes, the truss includes floating pipes, several of the floating pipes are arranged in a U-shape or a quasi-U-shape, and the floating pipes are connected by hot-melt; several of the connecting pipes are connected to the inside of the truss, and the connecting pipes and / or the connecting pipes and the truss are enclosed to form a plurality of floating raft units arranged in a rectangular array; the cage includes a frame and floats, the frame is used to hang oyster seedling strings and / or oyster cages, several of the floats are fixed under the frame, and the cage is detachably connected to at least one of the floating raft units. By setting the trusses of the floating raft assembly to a quasi-U-shape connected together by hot-melt, and connecting adjacent floating pipes together through multiple connectors, it is not easy to fall apart, thereby improving the stability and wind and wave resistance of the truss. At the same time, by connecting multiple connecting pipes to the inside of the truss to form a stable mesh structure, the stability of the truss is further enhanced, and the serious impact of the truss falling apart on the environment, oyster production, etc. is avoided.

[0015] Furthermore, the middle portion of each cage frame is mounted on a connecting pipe shared by two adjacent floating row units, and the ends of the frame are mounted on the floating pipes and / or connecting pipes on either side of the two adjacent floating row units, and / or the frame is connected to the floating pipes and / or connecting pipes on either side of the two adjacent floating row units via cables or fasteners; a plurality of floats are provided in the region of the frame located within each floating row unit; and a plurality of hooks are provided on the frame for connecting to a boom. By mounting the ends and middle portion of the long tube on the floating pipes and connecting pipes, a more stable support for the cage assembly is achieved, preventing the force exerted by the cage assembly on the floating pipes and / or connecting pipes from being primarily concentrated at the connection point with the binding ropes or fasteners, which could easily damage the connection between the floating pipes and / or connecting pipes and the binding ropes or fasteners.

[0016] Furthermore, the cage frame also includes vertically arranged vertical bars and horizontally arranged cross bars, and the top ends of the multiple vertical bars are fixedly connected to the frame; the cross bars include a first cross bar fixedly connected to the bottom ends of the vertical bars to form a rectangular frame structure, and a second cross bar fixedly connected to the first cross bar at both ends, and a plurality of the second cross bars are arranged corresponding to the support tubes for fixing the bottom of the oyster cage; a plurality of the cage frames are respectively arranged in a floating row unit and connected to the floating row unit by cables or fasteners. By arranging vertical bars and cross bars to form a cage frame space for accommodating oyster cages, it is not necessary to use additional fixing devices to fix the frame and oyster cages during harvesting and washing. In addition, the cross bars and frame respectively fix the two ends of the oyster cages, which can prevent the oyster cages from swinging due to water pressure during washing, thereby improving the washing effect and reducing energy consumption.

[0017] Furthermore, the lengths of the sides of the frame are equal. Step S50 includes: every 1-2 months, sequentially hoisting the cages from the main body of the floating raft, rotating the side of the cages facing the length of the main body to face the width of the raft, and placing the cages back into the main body of the floating raft; every 3-4 months, sequentially hoisting the cages from the main body of the floating raft, flushing the cages and oyster cages, and then installing the cages back into the main body of the floating raft; during the flushing process, monitoring the growth of the oysters. By regularly cleaning the cages and oyster cages, any attachments that may affect the oysters' feeding can be avoided. During the cleaning process, the growth of the oysters can also be monitored, thereby promptly identifying and addressing problems such as pests and diseases, thereby reducing the mortality rate of oysters and increasing oyster production.

[0018] Furthermore, in step S30, the spacing between the oyster cages or oyster seed strings is greater than 400 mm, and the aquaculture water depth of the oyster cages or oyster seed strings is maintained at 0.5-2.2 m. Each seed collector is equipped with 10 attached shells, with the attached shells spaced approximately 10 cm apart. Each attached shell holds 5-30 oyster seedlings. When the oyster seedlings on the oyster seed strings grow to a shell length of approximately 2-3 mm, the cages are moved to the aquaculture area. The oyster cages include several aquaculture chambers separated by several partitions, each with a radius of approximately 15 cm and a spacing of 15-20 cm between the partitions. Approximately 15 individual oyster seedlings are placed in each aquaculture chamber. This setting controls the aquaculture density of oysters to ensure that each oyster has sufficient space to grow and prevents oysters from squeezing each other and affecting their growth and breathing.

[0019] Furthermore, step S30 includes: tying a plurality of seedling collectors to a cage frame, placing the cage frame into a seawater cultivation pond for culturing oyster seedlings to collect seedlings, obtaining a plurality of oyster seedling strings, and then attaching a net to the oyster seedling strings; the individual oyster seedlings are obtained by the following steps: placing the cage frame with the oyster seedling strings into the floating raft body for culturing, and when the oyster seedlings on the oyster seedling strings grow to a shell length of 5-7 cm and a width of 2-3 cm, hanging the cage frame from the floating raft body, peeling off the oyster seedlings on the oyster seedling strings, and obtaining individual oyster seedlings. During the seedling collection stage, the seedling collectors are hung on the cage frame for adaptive cultivation, and then moved to the aquaculture area for cultivation. During the entire cultivation period, the seedling collectors and oyster cages only need to be fixed and disassembled once, which reduces the workload of the farmers and also reduces the impact on the growth of the oysters.

[0020] Furthermore, the floating pipes, connecting pipes, and frames are all made of HDPE material; reinforcing materials are provided inside the support pipes to enhance the strength of the support pipes. The floating raft body and cage frame are mainly made of HDPE raw materials, which have the advantages of being more wear-resistant, UV-resistant, more ductile, corrosion-resistant, and high-temperature-resistant. In addition, the support pipes supporting the oyster cages are reinforced pipes to improve the local strength and service life of the cage frame, so that the cage frame can still maintain structural integrity and stability in harsh sea conditions; while other parts are not reinforced to reduce the weight of the cage frame, increase the buoyancy of the cage frame, and reduce the pressure of the cage frame on the floating raft body. The increase in buoyancy helps to offset the downward pressure exerted by wind and waves on the floating raft body and cage frame, reducing the possibility of the floating raft body tilting, sinking, or even capsizing.

[0021] Furthermore, the oyster seedling cultivation process includes the following steps: in step S30, every one to two months, the cages in the floating raft body are sequentially hoisted, the cages and oyster cages are rinsed, and the growth status of the oysters is monitored. After rinsing, the cages are reinstalled on the floating raft body. The cages provided by the present invention facilitate regular rinsing, which helps remove biological attachments such as algae and shellfish that clog the cages, as well as other sediments, thereby maintaining unobstructed cage flow, improving water exchange, and preventing attachments from interfering with oyster feeding. Furthermore, during cleaning, the growth status of the oysters is monitored, allowing for the timely detection and treatment of pests and diseases, thereby reducing oyster mortality and increasing oyster yields.

[0022] Furthermore, the present invention also provides a method for polyculture of fish and oysters, comprising the following steps:

[0023] S100, constructing a floating raft body in an aquaculture sea area, with the width direction of the floating raft body arranged in the direction of the current, the floating raft body comprising a plurality of floating raft units arranged in a rectangular array, a plurality of anchor piles evenly arranged on the seabed on both sides of the width direction of the floating raft body, and connected to the width direction of the floating raft body by cables and / or anchor chains to secure the floating raft body;

[0024] S200, constructing a cage frame, the cage frame including a frame body and a plurality of support tubes spaced apart on the frame body, at least two floats being disposed below the frame body; connecting an oyster raft net to the outside of the float body to construct a fish farming cage;

[0025] S300, fixing a plurality of oyster seed strings and / or oyster cages filled with oysters to the frame body and / or support tubes of the cage rack at intervals by using cables;

[0026] S400: Deploy the cages into the floating row body via a crane arm, with one cage deployed for each floating row unit, wherein the cages are detachably connected to the floating row unit, or each cage is disposed on two adjacent floating row units, with both ends of the cages respectively connected to both ends of the two adjacent floating row units; and deploy the fry into the fish farming cages for mixed fish and oyster farming;

[0027] S500. Management during the breeding period: Feed the fry regularly; every 1-2 months, lift the cages out of the sea and rinse the oyster cages fixed on the cages. After rinsing, install the cages back on the floating rack body.

[0028] By connecting oyster racks with nets to form fish cages, fish and oyster polyculture is practiced, maximizing resource utilization and improving both ecological and economic benefits. As filter-feeding shellfish, oysters filter and absorb suspended matter, organic debris, and algae in the water, effectively purifying water quality, reducing eutrophication, and providing a cleaner living environment for fish. Fish excrement (such as feces) serves as high-quality feed for oysters, and the oysters' filter-feeding activity further purifies water quality, creating a virtuous cycle that helps maintain the ecological balance of the watershed. Furthermore, by feeding fish with a scientifically formulated feed, the fish feces produced directly serve as oyster feed, reducing the cost of purchased feed, and the oysters' filter-feeding activity also reduces water treatment costs. Furthermore, in this polyculture model, farmers can reap the benefits of both fish and oysters, increasing both the yield and economic benefits per unit of water.

[0029] Furthermore, the raft body comprises a truss and connecting pipes. The truss comprises floating tubes, several of which are arranged in a U-shaped or U-shaped pattern. The floating tubes are connected by hot-melt, and adjacent floating tubes are connected in parallel by a plurality of connectors. The connecting pipes and / or the floating tubes enclose a plurality of raft units arranged in a rectangular array. The connectors comprise a first bracket having sockets on both sides for connecting the floating tubes. The first bracket is topped with a handrail column with a plurality of connecting holes. The raft body also comprises a fixing pipe, which passes through the connecting holes of each first bracket in sequence and is connected end to end to form a rectangular frame. The top of the oyster rack net is connected to the rectangular frame, and the middle is connected to the truss. The height of the above-water portion of the oyster rack net is greater than 0.8m, and the depth of the underwater portion is 3.5-4.5m. This arrangement prevents fish from jumping out of the fish cage from above the oyster rack net, affecting economic benefits, and protects people walking or working on the platform from slipping and falling into the sea. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of oyster farming according to Example 1 of the present invention.

[0031] Figure 2 for Figure 1 BB cross-section diagram.

[0032] Figure 3 for Figure 1 A partial enlarged view of .

[0033] Figure 4 This is a schematic diagram of the structure of the floating row body.

[0034] Figure 5 for Figure 4 Schematic diagram of the structure of the truss of the floating raft body.

[0035] Figure 6 A schematic diagram of the structure of the connector.

[0036] Figure 7 Schematic diagram of the cage structure.

[0037] Figure 8 Schematic diagram of the connection between the cage frame and the oyster cage.

[0038] Figure 9 for Figure 8 Side view of the cage stand and oyster cage shown.

[0039] Figure 10 This is a schematic structural diagram of the cage described in Example 2.

[0040] Figure 11 This is a schematic diagram of the fish and oyster polyculture described in Example 3.

[0041] The technical solution of the present invention is described in detail below with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] Example 1

[0043] This embodiment provides an oyster cultivation method, which specifically includes the following steps:

[0044] S10. Construct a floating raft body in the aquaculture sea area, with the width direction of the floating raft body arranged in the direction of the water flow. The floating raft body includes a plurality of floating raft units arranged in a rectangular array, and a plurality of anchor piles are evenly distributed on the seabed on both sides of the width direction of the floating raft body. The anchor piles are connected to the width direction of the floating raft body by cables and / or anchor chains to fix the floating raft body.

[0045] Aquaculture areas are selected from deep offshore waters with abundant food, unaffected by inland environmental influences, and with water depths of 10-20 meters, temperatures of 12-30°C, clear water quality, and good fluidity, meeting the requirements of national Class I aquaculture waters. Specifically, muddy bottoms are rich in nutrients, and marine microalgae grow rapidly, providing abundant food suitable for oyster growth and shortening the oyster cultivation period. Deep offshore waters, unaffected by inland environmental influences, are far from inland pollution sources, ensuring the quality and safety of oysters. Appropriate seawater flow rates provide oysters with ample oxygen and food (such as plankton, bacteria, and algae), promoting their healthy growth. Moderate seawater flow rates also help maintain a clean aquaculture environment and reduce the risk of disease.

[0046] Specifically, if Figure 1-6 As shown, the floating row body 10 includes a truss 11, a connecting pipe, a floating bucket 13 and a connecting piece 14. The connecting pipe is connected to the inside of the truss 11 to form a plurality of floating row units A arranged in a rectangular array.

[0047] See Figure 2-5 The truss 11 includes transverse tubes 111 and vertical tubes 112. Several transverse tubes 111 and vertical tubes 112 are sequentially heat-fused together at their end portions to form a U-shaped or quasi-U-shaped truss 11. Adjacent transverse tubes 111 and adjacent vertical tubes 112 are arranged side by side via a plurality of connectors 14. Preferably, the two transverse tubes 111 and the two vertical tubes 112 are sequentially heat-fused together at their end portions to form a first rectangular frame. The two transverse tubes 111 and the two vertical tubes 112 are then arranged to form a second rectangular frame slightly smaller than the first rectangular frame. One end of the two transverse tubes 111 and the two vertical tubes 112 in the second rectangular frame protrudes beyond the second rectangular frame and connects to the vertical tubes 112 or transverse tubes 111 of the first rectangular frame, forming a quasi-U-shaped rectangular truss 11. In this embodiment, the ends of each floating tube are connected to the other floating tubes by hot-melt, and the middle of each floating tube is connected to the other floating tubes by a plurality of connectors 14. The ends of each connecting tube are fixedly connected to the second rectangular frame to enhance the stability of the truss 11 and prevent the truss 11 from falling apart due to wind and waves.

[0048] The connecting pipes include transverse connecting pipes and vertical connecting pipes 122. The transverse connecting pipes include a first transverse connecting pipe 121a and a second transverse connecting pipe 121b. The first transverse connecting pipe 121a is disposed in the middle of the truss 11 in the second direction, with its ends fixedly connected to the width of the truss 11. The two first transverse connecting pipes 121a are connected in parallel via a plurality of connectors 14. A plurality of vertical connecting pipes 122 and a plurality of second transverse connecting pipes 121b are interposed between adjacent first transverse connecting pipes 121a on the transverse floating pipe 111. One end of the vertical connecting pipe 122 is fixedly connected to the transverse floating pipe 111 or the first transverse connecting pipe 121a, and the other end is fixedly connected to the second transverse connecting pipe 121b. The ends of the second transverse connecting pipe 121b are fixedly connected to the two vertical floating pipes 112. In this embodiment, the first direction is the length of the floating row assembly 10, and the second direction is the width of the floating row assembly 10. The width of each floating row unit A in the second direction of the truss 11 is uniform, and at least two floating row units A have different lengths. Preferably, the length of the floating row units A at the ends of the truss 11 in the first direction is shorter than the length of the floating row units A in the middle of the truss 11 in the first direction, and the lengths of the floating row units A in the second direction are different. In other embodiments, the first direction may be the width direction, and the second direction may be the length direction, without limitation.

[0049] Several of the floats 13 are fixed to the bottom of the truss 11 and / or the bottom of the two first transverse connecting pipes 121a, and the narrow sides of the floats 13 are arranged in the direction of the water flow to reduce the force of the water flow and waves on the floating raft body 10 and improve the stability of the floating raft body 10.

[0050] See Figure 6 The connector 14 includes a bracket 141, which is an integrally formed bracket structure. Sockets 142 are provided on both sides of the bracket 141. The floating tube or connecting tube passes through the sockets 142, thereby connecting the connector 14 to two adjacent floating tubes or two adjacent connecting tubes. The connector 14 connected to the floating tube also includes a handrail column 143 fixed to the top of the bracket 141. The handrail column 143 is located on the outside of the truss 11 and is provided with a plurality of connection holes 143a. The floating raft body 10 also includes a fixed tube 16, which passes through the corresponding connection holes 143a of each connector 14 in sequence and is connected end to end to form a fixed frame. The multi-layer fixed frame further enhances the stability of the truss 11 and provides protection for people walking on the steps. Preferably, two connecting holes 143 a are provided on the handrail column 143 , the distance between the two connecting holes 143 a is 50-70 cm, and the height of the connecting piece 14 with the handrail column 143 is 110-130 cm.

[0051] The pedal 15 is disposed above the truss 11 and / or the connecting pipe. Specifically, a pedal mounting base is provided on the top of the bracket 141, and the pedal 15 is fixed to the pedal mounting base via a locking member. Preferably, the pedal is greater than 350 mm in width and greater than 65 mm in thickness.

[0052] Several anchor piles 30 are symmetrically arranged on the outside of the floating raft body 10 and are respectively connected to the width direction of the floating raft body 10. By fixing the anchor piles 30 on both sides of the width direction of the floating raft body 10, the impact of wind and waves on the width direction of the floating raft body 10 is reduced, and the wind and wave resistance of the oyster rack is further improved.

[0053] Preferably, the truss 11 and connecting pipes are both made of high-density polyethylene (HDPE), and the connecting piece 14 is injection molded using HDPE raw material. More preferably, the second transverse connecting pipe 121b is an HDPE pipe with internal reinforcement ribs or a reinforcement layer to withstand the downward pressure exerted by the cage assembly 20 on the second transverse connecting pipe 121b. By strengthening the strength of the floating raft body 10 at local locations, the floating raft body 10 can minimize gravity and increase buoyancy while also increasing the strength of the locations that primarily bear the weight or pressure of the oyster cages. This prevents the floating raft body 10 from being damaged or falling apart due to insufficient strength, resulting in the loss of the oyster cages and affecting economic benefits. In addition, the floating raft body made of HDPE raw material has the advantages of greater wear resistance, UV resistance, better extensibility, corrosion resistance, and high temperature resistance, preventing the floating raft body from being corroded by seawater immersion and long-term exposure to sunlight and rain, which can cause damage and difficulty in repair.

[0054] Furthermore, in some embodiments, the floating tube is a HDPE tube with an outer diameter of 315 mm and a wall thickness of 12 mm or greater, and the connecting tube is a HDPE tube with an outer diameter of 300 mm or greater and a wall thickness of 15 mm or greater. In other embodiments, the dimensions of the truss 11 and the connecting tube can be adjusted according to specific requirements.

[0055] S20. Construct a cage frame, wherein the cage frame includes a frame body and a plurality of support tubes spaced apart on the frame body, and at least two floats are disposed below the frame body.

[0056] Specifically, see Figure 1-9The cage 20 includes a frame 21 and a float 22. The frame 21 includes a long tube 211, a short tube 212 and a support tube 213. At least two long tubes 211 and at least two short tubes 212 are perpendicular to each other to form a rectangular frame body. Several support tubes 213 are arranged above the long tubes 211 at intervals, extend along the length direction of the short tubes 212, and are fixedly connected to at least two long tubes 211. At least two floats 22 are symmetrically arranged at the bottom of the frame 21 and fixedly connected to the corresponding long tubes 211 and / or the short tubes 212 to provide buoyancy for the cage 20 and maintain the balance and stability of the cage 20.

[0057] Preferably, the frame 21 is constructed entirely of high-density polyethylene (HDPE). More preferably, the support tubes 213 and short tubes 212 are internally provided with reinforcing ribs or layers to enhance the strength of the HDPE tubes. These ribs or layers may be made of a reinforcing material such as fiberglass. By strengthening the cage frame 20 in certain locations, the cage frame 20 minimizes gravity and increases buoyancy while also strengthening the areas primarily bearing the weight or pressure of the oyster cage. This prevents the cage frame 20 from being damaged or falling apart due to insufficient strength, which could lead to the loss of the oyster cage and negatively impact economic returns. In addition, by setting the supporting tubes for supporting the oyster cage as reinforced tubes, the local strength and service life of the cage frame 20 are improved, so that the cage frame 20 can still maintain the structural integrity and stability under severe sea conditions; while other parts are not reinforced to reduce the weight of the cage frame 20, increase the buoyancy of the cage frame 20 and the downward pressure of the cage frame 20 on the floating row body 10, thereby helping to offset the downward pressure generated by wind and waves on the cage frame 20 and the floating row body 10, and reduce the possibility of the cage frame 20 and the floating row body 10 tilting, sinking or even capsizing.

[0058] Furthermore, in some embodiments, the long tube 212 and the short tube 211 are HDPE tubes with an outer diameter of 125 mm and a wall thickness of 7.4 mm or greater, and the support tube 213 is an HDPE tube with an outer diameter of 90 mm and a wall thickness of 6.7 mm or greater. In other embodiments, the dimensions of the long tube 212, the short tube 211, and the support tube 213 can be set according to specific needs.

[0059] S30. Fix several oyster seed strings and / or oyster cages filled with oysters to the frame body and / or support tube of the cage frame at intervals through cables; wherein the oyster seed string is an attached shell string with several oyster seed species attached, and the attached shell string includes several attached shells and ropes, the surface of the attached shells is provided with rope threading holes, the interior of the rope threading holes is penetrated by a rope, several oyster seed species are attached to the attached shells, and the net cover is provided outside the oyster seed string; the oyster cage includes a net cage and a multi-layer partition provided in the net cage, the net cage is provided with several flexible cables passing through and fixing the partition, and the net cage is divided by the partition to form several breeding chambers.

[0060] Specifically, see Figure 8-9 The tops of several oyster seed strings and / or oyster cages are spaced apart on the short tube 212 and the support tube 213 of the cage frame 20 via cables. The spacing between the oyster seed strings and / or oyster cages is greater than 400 mm, and the distance between the top partition of the oyster cage and the frame 21 is 0.5-1 m. In some embodiments, the cage frame 20 further includes fasteners, several of which are fixed to the support tube 213 and / or the short tube 212. The oyster seed strings or oyster cages are connected to the fasteners via cables, and the oyster cages can be easily and quickly installed or removed by manually opening and closing the fasteners.

[0061] Furthermore, the step S30 further includes the following steps:

[0062] S31. Attach several seed collectors to a cage rack and place the cage rack into a seawater incubation tank for oyster seedlings to collect seedlings, obtaining several strings of oyster seedlings. Netting is then applied to the strings. Specifically, healthy, vigorous oyster seedlings are selected to ensure they are disease-free, genetically superior, and highly adaptable. Oyster seedlings are then placed at an appropriate density in the seawater incubation tank, providing ample plankton as food. The water temperature and salinity of the seawater incubation tank are maintained at 20-25°C and 28-35‰. Once 70-80% of the oyster seedlings have developed eye spots, attached shell strings are placed as seed collectors. The oyster seedlings attach to the attached shells, and microalgae (such as Chlorella and diatoms) are added daily as the primary food source for the oyster seedlings.

[0063] When collecting seedlings, the attached shellfish strings are tied to the cage frame, and the cage frame is hung or suspended in the seawater cultivation pond for seedling collection. Each piece of attached shellfish is attached with 5-30 oyster seedlings to obtain a number of oyster seedling strings. When the oyster seedlings on the oyster seedling string grow to a shell length of about 2-3 mm (shell length refers to the length of the oyster shell measured along its longest axis), a net is attached to the outside of the oyster seedling string. In other embodiments, the attached shellfish string can be tied to a crossbar first and hung in the seawater cultivation pond for seedling collection. After the seedling collection is completed, the attached shellfish string is fixed to the cage frame. In addition, during the cultivation period, the density of the oyster seedlings in the seawater cultivation pond is adjusted according to the growth status of the oyster seedlings. Generally, the cultivation density of the oyster seedlings in the D-shaped larvae stage is controlled to be about 5 / mL, and the cultivation density in the eye-spot larvae stage is controlled to be about 1 / mL.

[0064] The seawater culture pond uses deep ocean water and changes the water daily to allow the oyster seedlings to adapt to the deep-sea aquaculture environment in advance and enhance the survival rate of oysters in deep-sea aquaculture. The seawater culture pond is also regularly cleaned of leftover bait, feces, dead oysters and other debris to ensure clean water quality that meets the national requirements for Class I fishery aquaculture water.

[0065] S32. Place individual oyster seedlings at an appropriate density into oyster cages, then secure the tops of several oyster cages to a cage rack using cables. The spacing between oyster cages in each cage rack is greater than 400 mm, the tops of the oyster cages are 0.5-1 m above the sea surface, and the cages are 1-1.5 m high. The shells of the individual oyster seedlings are 5-7 cm long and 2-3 cm wide.

[0066] The culture density of oysters in oyster cages is determined according to the size of the oysters, the growth stage and the specific conditions of the culture facilities. Too high a density causes the oysters to squeeze each other, affecting their growth and breathing, while too low a density leads to reduced economic benefits. Specifically, in this embodiment, the oyster cage is provided with six layers of partitions, each with a radius of about 15 cm, and the spacing between the partitions is 15-20 cm, that is, the oysters are cultured in an area 0.5-2.5 m from the sea surface, and the density of oysters is about 15 per culture chamber to ensure that each oyster has enough space to grow and avoid squeezing each other and affecting their growth and breathing. In other embodiments, the size and number of partitions in the oyster cage can be set according to specific needs, and the density of oysters can be adjusted according to the size of the oysters, the size of the oyster cage, etc.

[0067] Furthermore, the individual oyster seedlings can be purchased directly or obtained by the following method: the cage frame with the oyster seedling strings fixed thereon is placed into a seawater cultivation pond or a floating raft body for cultivation. When the oyster seedlings on the oyster seedling strings grow to a shell length of 5-7 cm and a width of 2-3 cm, the cage frame is taken out and the oysters on the oyster seedling strings are peeled off to obtain the individual oyster seedlings.

[0068] Furthermore, in some embodiments, step S30 further includes setting up an indoor operation room onshore or on a work vessel, where the oyster seed strings and / or oyster cages are secured to the cage frames. The peeling of oysters from the oyster seed strings and the placement of individual oyster seed into the oyster cages are also completed in the indoor operation room. This arrangement reduces the need for farmers to work directly on the sea, improves the safety of the work environment, and mitigates the effects of weather on operations.

[0069] S40. Using a workboat, cages containing strings of oyster seed and / or oyster cages are transferred from shore to the aquaculture area, and the cages are deployed into the floating row body via a crane arm for oyster aquaculture. Each cage is positioned on two adjacent floating row units, with both ends of the cage connected to both ends of the two adjacent floating row units. Alternatively, at least one cage is deployed in each floating row unit, and the cage is detachably connected to the floating row unit. Preferably, a plurality of cages are arranged along the length of adjacent floating row units and extend along the width of the two adjacent floating row units, with both ends and the middle of the cage connected to the length of the two adjacent floating row units.

[0070] Specifically, see Figure 1-2, each of the cages 20 is provided on at least two floating row units A. Specifically, the frame 21 of the cage 20 is set on a common connecting pipe between at least two adjacent floating row units A, and the cage 20 is located in the area of ​​each floating row unit A. A number of oyster cages are hung on the frame 21, and a number of floats 22 are fixed at the bottom, and at least two cages are provided on the two adjacent floating row units. By setting the cage 20 on the connecting pipe between at least two floating row units A, the mechanized installation of the cage 20 and the harvesting cage 20 are facilitated. Furthermore, the cage 20 is connected to the truss 11 and / or the connecting pipe forming the floating row unit A by a cable or fastener, thereby improving the stability and wind and wave resistance of the oyster rack and preventing the cage 20 from being separated from the floating row body 10.

[0071] Furthermore, one end of the long tube 211 of the cage 20 is placed on the truss 11 and is clamped with the connector 14 on the truss 11, and the other end is placed on the first transverse connecting pipe 121a and is clamped with the connector 14 on the first transverse connecting pipe 121a, thereby facilitating the rapid installation of the cage 20 and the floating row body 10.

[0072] In other embodiments, at least one cage 20 is provided in each floating row unit A, and the cage 20 is detachably connected to both ends of the floating row unit A.

[0073] Furthermore, the cage 20 also includes hooks, and a plurality of the hooks are symmetrically arranged on the frame 21. The hooks cooperate with the hooks of the boom to facilitate the installation or harvesting of the cage 20 by the boom of the workboat.

[0074] S50. Management during the culture period: At regular intervals, the cages in the floating rack body are hoisted out in turn, and the cages and the oyster cages fixed on the cages are rinsed. After the rinsing is completed, the growth status of the oysters is observed, and the cages are placed back into the floating rack body. When the oysters grow to commercial specifications, the oysters are harvested.

[0075] Furthermore, the step S50 specifically includes the following steps:

[0076] S51. During the oyster cage culture period, every 1-2 months, the cages in the floating rack body are hoisted out in turn, and the cages and oyster cages are rinsed. After rinsing, the cages are installed back into the floating rack body. During the rinsing process, the growth status of the oysters is monitored to facilitate timely detection of diseases and intervention. At the same time, the cages and oyster cages are inspected and repaired in a timely manner.

[0077] In this embodiment, a water pump is used to flush the cages and oyster cages. The pump has a maximum head of 30 meters and a maximum flow rate of 20 m³ / h. Regular flushing helps remove algae, shellfish, and other biological deposits that can clog the cages, thereby maintaining unobstructed flow, improving water exchange, and preventing deposits from interfering with oyster feeding.

[0078] In addition, online water quality monitoring equipment can be used to monitor the temperature, salinity, pH value, dissolved oxygen, turbidity, etc. of the aquaculture area during oyster cage aquaculture, and adjust the cleaning frequency of the oyster cage according to the water quality. When the water quality is poor, the cleaning frequency of the oyster cage should be increased; the blockage of the oyster cage can also be directly observed. If the mesh of the oyster cage is full of mud, the oyster cage can be flushed.

[0079] In order to shorten the oyster cultivation time, the types and concentrations of microalgae in the cultivation area can be regularly tested during the oyster cage cultivation period, and microalgae bait can be added to the cultivation area based on the test results to promote the growth of oysters.

[0080] In addition, each time you rinse the cages and oyster cages, you can check the cages and oyster cages and repair them in a timely manner to avoid damage and loss of oysters.

[0081] S52. After 1-2 years of natural cultivation, oysters can be harvested when they reach the commercial size of 12-15cm and the soft part is plump. When harvesting, each cage rack is lifted out of the sea in turn, the oyster cages on the cage racks are removed, and the oysters in the cages are harvested.

[0082] Among them, using boats and cranes to lift cages can improve work efficiency and reduce the workload of farmers.

[0083] The oyster farming method provided in this embodiment uses modular cages and floating rafts for deep-sea oyster farming. The cages and floating rafts can be combined to carry out oyster farming. The modular cages can provide a more stable growth environment for oysters, reduce the impact of natural factors such as wind and waves, and are beneficial to the growth of oysters. It is also beneficial to the refined management of oysters. In addition, the cages and floating rafts can be quickly separated, which facilitates regular cleaning of attachments on the cages and oyster cages to prevent attachments from affecting oyster feeding. During cleaning, the growth of oysters can also be checked, so that problems such as diseases and pests can be discovered and dealt with in a timely manner, thereby reducing the mortality rate of oysters and increasing oyster production.

[0084] Example 2

[0085] This embodiment provides an oyster cultivation method, comprising the following steps:

[0086] S10. Construct a floating raft body in the aquaculture sea area, with the width direction of the floating raft body arranged in the direction of the water flow. The floating raft body includes a plurality of floating raft units arranged in a rectangular array, and a plurality of anchor piles are evenly distributed on the seabed on both sides of the width direction of the floating raft body. The anchor piles are connected to the width direction of the floating raft body by cables and / or anchor chains to fix the floating raft body.

[0087] S20. Construct a cage frame, wherein the cage frame includes a frame body and a plurality of support tubes spaced apart on the frame body, and at least two floats are disposed below the frame body.

[0088] Specifically, see Figure 10 The cage frame of this embodiment is similar to that of Example 1, except that, in this embodiment, the cage frame 20 further includes fixing rods, which include vertical rods 231 and horizontal cross rods. The tops of the multiple vertical rods 231 are fixedly connected to the frame 21. The cross rods include first cross rods 232, whose bottoms are fixedly connected to the vertical rods 231 to form a rectangular frame structure, and second cross rods 233, whose ends are fixedly connected to the first cross rods 232. The multiple second cross rods 233 correspond one-to-one with the short tubes 212 and support tubes 213, and are parallel to the short tubes 212 and support tubes 213. They are used to fix the bottom of the oyster cage, enhance the stability and safety of the oyster cage during the cultivation process, and prevent the oyster cage from being lost due to wind and wave impacts. During oyster cultivation, each cage frame 20 is installed in a floating row unit A and detachably connected to the floating row body 10, so that each cage frame 20 is independent of each other, avoiding collisions between cage frames 20 and facilitating the farmers' unit operations.

[0089] In some embodiments, the vertical rod 231 is fixed to one of its two adjacent vertical rods 231 through a connecting rod to enhance the stability of the cage 20. Preferably, the connecting rod is arranged in the width direction of the cage 20 to facilitate farmers to operate in the length direction.

[0090] In some embodiments, the second crossbar 233 is perpendicular to the short tube 212 and the support tube 213, and their horizontal projections partially overlap. The overlapping position is where the oyster seed strings and / or oyster cages are hung. The multiple vertical rods 231 and the multiple crossbars form a second frame for accommodating the oyster cages, further enhancing the cage frame's stability and preventing the loss of oyster seed strings or oyster cages.

[0091] S30, fixing a plurality of oyster seed strings and / or oyster cages filled with oysters to the frame body and / or support tubes of the cage rack at intervals by cables.

[0092] S40: Using a work boat, transfer the cages with oyster seed strings and / or oyster cages fixed thereon from the shore to the aquaculture sea area, and use a crane arm to drop the cages into the floating raft body for oyster aquaculture; each floating raft unit is dropped with at least one cage, and the cages are detachably connected to the floating raft unit.

[0093] S50. Management during the culture period: At regular intervals, the cages in the floating rack body are lifted out in sequence by the crane arm, and the cages and the oyster cages fixed on the cages are rinsed. After the rinsing is completed, the growth status of the oysters is observed, and the cages are placed back into the floating rack body. When the oysters grow to commercial specifications, the oysters are harvested.

[0094] By arranging that one end of the oyster cage is connected to the short tube 212 and the support tube 213, and the other end is connected to the second cross bar 233, the fixing rod can support the entire cage frame when flushing the oyster cage, and no additional fixing device is needed to fix the frame and the oyster cage. In addition, the fixing rod and the frame 21 fix the two ends of the oyster cage, which can prevent the oyster cage from swinging due to the water pressure during flushing, resulting in poor flushing effect.

[0095] Example 3

[0096] This embodiment provides an oyster cultivation method, comprising the following steps:

[0097] S10. Construct a floating raft body in the aquaculture sea area, with the width direction of the floating raft body arranged in the direction of the water flow. The floating raft body includes a plurality of floating raft units arranged in a rectangular array, and a plurality of anchor piles are evenly distributed on the seabed on both sides of the width direction of the floating raft body. The anchor piles are connected to the width direction of the floating raft body by cables and / or anchor chains to fix the floating raft body.

[0098] S20. Construct a cage frame, wherein the cage frame includes a frame body and a plurality of support tubes spaced apart on the frame body, and at least two floats are disposed below the frame body.

[0099] Specifically, see Figure 10 The cage of this embodiment is similar to that of embodiment 1 or embodiment 2, except that, in this embodiment, the frame 21 of the cage 20 is square, and the frame 21 includes a horizontal tube, a vertical tube and a support tube 213 of the same length. At least two horizontal tubes and at least two vertical tubes are perpendicular to each other to form a square frame body. Several support tubes 213 are arranged on the frame body at intervals. At least two floats 22 are symmetrically arranged at the bottom of the frame 21 and fixedly connected to the corresponding horizontal tubes and / or vertical tubes to provide buoyancy for the cage 20 and maintain the balance and stability of the cage 20.

[0100] S30, fixing a plurality of oyster seed strings and / or oyster cages filled with oysters to the frame body and / or support tubes of the cage rack at intervals by cables.

[0101] S40. Using a workboat, cages containing strings of oyster seed and / or oyster cages are transferred from shore to the aquaculture area, and the cages are deployed into the floating row body via a crane arm for oyster aquaculture. Each cage is positioned on two adjacent floating row units, with both ends of the cage connected to both ends of the two adjacent floating row units. Alternatively, at least one cage is deployed in each floating row unit, and the cage is detachably connected to the floating row unit. Preferably, a plurality of cages are arranged along the length of adjacent floating row units and extend along the width of the two adjacent floating row units, with both ends and the middle of the cage connected to the length of the two adjacent floating row units.

[0102] S50. Management during the culture period: At regular intervals, the cages in the main body of the floating rack are hoisted out in turn, and the side of the cages facing the length direction of the floating rack body is rotated to face the width direction of the floating rack body, and the cages are placed back into the main body of the floating rack body; at regular intervals, the cages in the main body of the floating rack body are hoisted out in turn, and the cages and the oyster cages fixed on the cages are rinsed. After the rinsing is completed, the growth status of the oysters is observed, and the cages are placed back into the main body of the floating rack body; when the oysters grow to commercial specifications, the oysters are harvested.

[0103] Furthermore, step S50 specifically includes the following steps: during the oyster cage culture period, every 1-2 months, the cage frames in the floating rack body are hoisted out in turn, the side of the cage frames facing the length direction of the floating rack body is turned to face the width direction of the floating rack, and the cage frames are put back into the floating rack body; every 3-4 months, the cage frames in the floating rack body are hoisted out in turn, the cage frames and oyster cages are rinsed, and the cage frames are installed back into the floating rack body after the rinsing is completed; during the rinsing process, the growth status of the oysters is detected to facilitate timely detection of diseases and intervention.

[0104] After 1-2 years of natural cultivation, oysters can be harvested when they reach the commercial size of 12-15cm and the soft part is plump. When harvesting, each cage is lifted out of the sea in turn, the oyster cages on the cage are removed, and the oysters in the cages are harvested.

[0105] By setting the cage frame to be square, it is convenient to regularly rotate the surface of the cage frame facing the water flow direction, thereby changing the direction of automatic flushing of the cage frame and the oyster cage fixed on the cage frame by the water flow in the seawater, reducing the frequency of manual flushing of the cage frame and oyster cage by farmers, reducing the impact of high-pressure flushing on the growth of oysters, and saving energy consumption and costs.

[0106] Example 4

[0107] This embodiment provides a method for polyculture of fish and oysters, which specifically includes the following steps:

[0108] S100. Construct a floating raft body in the aquaculture sea area. The width direction of the floating raft body is arranged in the direction of the water flow. The floating raft body includes a plurality of floating raft units arranged in a rectangular array. A plurality of anchor piles are evenly distributed on the seabed on both sides of the width direction of the floating raft body, and are connected to the width direction of the floating raft body by cables and / or anchor chains to fix the floating raft body.

[0109] S200, constructing a cage frame, wherein the cage frame includes a frame, the frame includes a frame body and a plurality of support tubes spaced apart on the frame body, and at least two floats are arranged below the frame body; at the same time, an oyster raft net is connected to the outside of the float raft body to construct a fish farming cage.

[0110] Specifically, see Figure 11 The fish and oyster co-culture device of this embodiment is similar to the oyster culture device of Example 1, except that in this embodiment, the height of the connecting member 14 with the handrail column 143 is 1.1-1.3 meters, making the floating raft body 10 above the water height greater than 1 meter. The floating raft body 10 also includes a fixing pipe 16, which passes through the corresponding connection holes 143a of each connecting member 14 in sequence and is connected end to end to form a fixed frame. The top of the oyster raft net is detachably connected to the fixed frame above the floating raft body 10, and the middle is connected to the outside of the truss 11. The oyster raft net has a height of approximately 1 meter above the water and a depth of 3.5-4.5 meters, preferably 4 meters. The provision of the handrail column and fixed frame not only protects people walking or working on the steps from slipping and falling into the sea, but also connects the oyster raft net to prevent fish in the fish farming cages from jumping out of the oyster raft net and affecting economic benefits.

[0111] S300: Fix several oyster seed strings and / or oyster cages filled with oysters to the frame body and / or support tubes of the cage rack at intervals through cables.

[0112] S400. The cage is placed into the floating row body through the crane arm, and each cage is set on two adjacent floating row units, and the two ends of the cage are respectively connected to the two ends of the two adjacent floating row units, or at least one cage is placed in each floating row unit, and the cage is detachably connected to the floating row unit; and the fry is placed into the fish farming cage for mixed fish and oyster farming.

[0113] Among them, fish that swim slowly, are omnivorous, and live in the middle and upper layers of water are selected for mixed fish and oyster farming; when releasing fish fry, large-sized fry with intact bodies, no parasitic infections, strong vitality, and uniform sizes are selected.

[0114] S500. Management during the aquaculture period: Regularly feed the fry with bait; every 1-2 months, hoist the cages out of the sea and rinse the oyster cages fixed on the cages. After rinsing, install the cages back on the floating rack body; harvest the oysters and / or fry when they reach commercial specifications.

[0115] In the fish-oyster polyculture model of this embodiment, there is a close relationship between fish and oysters, which is mainly reflected in the following aspects: (1) Ecological complementarity: fish help improve water quality and increase oxygen content in the water through behaviors such as feeding and swimming; oysters remove suspended matter, organic matter and harmful substances in the water through filtering, further purifying the water quality. This ecological complementary relationship helps maintain the stability and health of the aquaculture environment; (2) Resource sharing: In the same aquaculture environment, fish and oysters can share nutrients and living space in the water, and the feces excreted by fish can be used as a buffer to improve the water quality. Organic matter such as feces and leftover bait can provide a rich source of nutrition for oysters; and the filter feeding of oysters can also help reduce pollutants and harmful substances in the water, providing a cleaner growth environment for fish; (3) Mutual symbiosis: The filter feeding of oysters can help reduce the content of harmful substances such as ammonia nitrogen and nitrite in the water, providing a more suitable living environment for fish; the activities of fish can also help promote the circulation and mixing of water, improve the filter feeding efficiency and growth rate of oysters, and in addition, fish may also provide necessary shade and shelter for oysters, reducing their risk of being attacked by natural enemies.

[0116] In summary, compared with the prior art, the oyster culture method and the fish-oyster polyculture method provided by the present invention have the following beneficial effects:

[0117] (1) Modular gravity cage oyster racks are used for offshore oyster farming. This device has the advantages of strong wind and wave resistance (15-level typhoon), good stability, and long service life. It can reduce the impact of wind and waves on oysters, improve the stability of the oyster farming environment, and thus promote the growth of oysters.

[0118] (2) The present invention fixes the oyster cage on a cage frame that is detachably connected to the floating raft body. The farmer can lift the cage frame out of the sea or connect it to the floating raft body through the crane arm of the working boat, and can fix or separate the oyster cage from the cage frame on the working boat or on the shore, thereby facilitating the farmer's operation. In addition, during the breeding process, cage breeding helps the farmer to regularly clean the cage frame and oyster cage and observe the breeding conditions of oysters.

[0119] (3) Compared with traditional floating raft aquaculture, in which farmers need to work on the sea surface for a long time, the cage frame provided by the present invention can be separated from the floating raft body. Therefore, farmers can fix or separate the oyster cage or oyster seedling string from the cage frame on the working boat, on the shore, and especially indoors, thereby reducing the farmers' working time at sea and avoiding the influence of weather on the working at sea, which in turn affects the progress of oyster farming. At the same time, it also improves the safety of the farmers' working environment.

[0120] (4) By setting the width direction of the floating raft body toward the water flow, the waves will act mainly in the width direction of the floating raft body rather than in the length direction, thereby reducing the impact of the waves on the floating raft body by reducing the effective area; at the same time, by setting anchor piles on both sides of the width direction of the floating raft body to fix the floating raft body, the stability and wind and wave resistance of the overall structure will be enhanced.

[0121] (5) By setting the cage frame in a square shape and rotating the direction of the cage frame at regular intervals, different sides of the cage frame can be flushed with seawater, which is beneficial to keeping the oyster cage clean and reducing the occurrence of diseases. At the same time, it can reduce the frequency of manual flushing of oyster cages by farmers and reduce the impact of high-pressure flushing on oysters, while also saving energy.

[0122] (6) Compared with the traditional method of fixing the oyster cage to the oyster rope, the present invention fixes the oyster cage to the cage frame, and the overall structure is stable, which can reduce the swing of the oyster cage when washing the oyster cage and the cage frame, and improve the washing effect.

[0123] (7) In the oyster culture method of the present invention, a seed collector is fixed on a cage frame, and the cage frame is placed in a seawater culture pool for oyster seedlings to collect seedlings and adapt to culture. The cage frame is then moved to a culture sea area for culture. After the oyster seedlings grow to a suitable size, the oyster seedlings are separated from the seed collector and divided into cages. The oyster cages containing individual oyster seedlings are fixed to the cage frame and checked to ensure that they are firmly fixed. The cage frame is then moved to a culture sea area for culture. During the process, the cage frame is lifted up for cleaning several times. The entire culture process only requires the seed collector and oyster cage to be disassembled and fixed once. At other times, the cage frame can be moved by the crane arm, which saves manpower, facilitates unit operation, and has high efficiency. It can minimize the time of moving oysters and other processes, thereby reducing the impact on the oysters.

[0124] (8) By connecting oyster racks with nets to form fish cages on the outside of oyster racks, fish and oysters can be mixed and cultured to maximize resource utilization and improve ecological and economic benefits: Oysters, as filter-feeding shellfish, can filter and absorb suspended matter, organic debris and algae in the water, effectively purifying water quality, reducing eutrophication of water bodies, and providing a cleaner living environment for fish. Fish excrement (such as fish feces) is a high-quality feed for oysters, and the oysters' filter feeding activity promotes water purification. A good ecological cycle is formed between the two, which is conducive to maintaining the ecological balance of the water body. In addition, by feeding fish with scientifically proportioned feed, the fish feces produced can be directly used as feed for oysters, reducing the cost of purchasing feed, and the oysters' filter feeding function also reduces the cost of water quality treatment. Moreover, in the fish and oyster mixed culture model, farmers can obtain the benefits of both fish and oysters at the same time, improving the output rate and economic benefits of each unit of water body.

[0125] (9) Compared with the bamboo and wood materials of traditional floating rafts, HDPE materials have the advantages of being more environmentally friendly, more wear-resistant, UV-resistant, more extensible, corrosion-resistant and high-temperature-resistant. Oyster racks made of HDPE pipes can be used in seawater for a long time without being easily damaged, avoiding the aging problems caused by seawater erosion and ultraviolet radiation. They also have a high bearing capacity and can withstand large weights and pressures. They are structurally stable and not easily deformed, ensuring the stability of oyster racks in various sea conditions. In addition, HDPE pipes can be recycled and reused after use, reducing pollution to the environment. At the same time, they will not release harmful substances into the seawater and are harmless to the marine ecological environment. Due to their strong corrosion resistance and weather resistance, their maintenance and upkeep are relatively simple. They have the characteristics of long service life, low maintenance cost and good environmental protection, which makes them more economically beneficial in the long term.

[0126] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications of the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims of the present invention and equivalent technologies, the present invention is also intended to include these changes and modifications.

Claims

1. A method for oyster cultivation, characterized in that: The steps include: S10. Constructing a floating raft body in the aquaculture sea area, with the width direction of the floating raft body arranged in the direction of the current, the floating raft body comprising a plurality of floating raft units arranged in a rectangular array, and a plurality of anchor piles evenly arranged on the seabed on both sides of the width direction of the floating raft body, and connected to the width direction of the floating raft body by cables and / or anchor chains to secure the floating raft body; S20, constructing a cage, wherein the cage includes a frame, the frame includes a frame body and a plurality of support tubes spaced apart on the frame body, and at least two floats are disposed below the frame body; S30, fixing a plurality of oyster seed strings and / or oyster cages filled with oysters to the frame body and / or support tubes of the cage rack at intervals by cables; S40, placing the cages into the floating row body by means of a crane arm for oyster cultivation: each cage is placed on two adjacent floating row units, with two ends of the cage connected to two ends of the two adjacent floating row units respectively; or, placing at least one cage in each floating row unit, with the cage being detachably connected to the floating row unit; S50, management during the culture period: at regular intervals, the cages in the floating rack body are sequentially lifted out by the crane arm, and the cages and the oyster cages fixed on the cages are rinsed. After the rinsing is completed, the growth status of the oysters is observed, and the cages are returned to the floating rack body; In step S10, the floating raft body includes a truss and connecting pipes, the truss including transverse floating pipes and vertical floating pipes, a plurality of the transverse floating pipes and a plurality of vertical floating pipes are sequentially hot-melt-connected at their head and tail ends to form a truss arranged in a U-shaped or quasi-U-shaped shape, and adjacent two transverse floating pipes and adjacent two vertical floating pipes in the truss are arranged in parallel with each other via a plurality of connecting members; a plurality of the connecting pipes are fixedly connected to the interior of the truss, and the connecting pipes and / or the connecting pipes and the truss enclose a plurality of floating raft units arranged in a rectangular array; In step S40, the middle portion of each cage frame is mounted on a connecting pipe shared by two adjacent floating row units, and the two ends are respectively mounted on the two ends of the two adjacent floating row units, and at least two cage frames are provided in total for the two adjacent floating row units, and the cage frames are snap-connected to the connecting pieces on the trusses; and a plurality of floats are respectively provided on the portion of the frame located in each floating row unit.

2. The oyster cultivation method according to claim 1, characterized in that: A plurality of hooks are provided on the frame for connecting the boom.

3. The oyster cultivation method according to claim 2, characterized in that: The cage frame also includes vertically arranged vertical rods and horizontally arranged cross rods, and the top ends of multiple vertical rods are fixedly connected to the frame; the cross rods include a first cross rod fixedly connected to the bottom ends of the vertical rods to form a rectangular frame structure, and a second cross rod with both ends respectively fixed to the first cross rod, and several second cross rods are arranged corresponding to the support tubes for fixing the bottom of the oyster cage; several cage frames are respectively arranged in a floating row unit and are connected to the floating row unit by cables or fasteners.

4. The oyster cultivation method according to claim 2, characterized in that: The lengths of the sides of the frame are equal; step S50 includes: every 1-2 months, the cages in the floating row body are hoisted out in turn, the side of the cages facing the length direction of the floating row body is rotated to face the width direction of the floating row body, and the cages are placed back into the floating row body; every 3-4 months, the cages in the floating row body are hoisted out in turn, the cages and oyster cages are rinsed, and the cages are installed back into the floating row body after the rinsing is completed; during the rinsing process, the growth status of the oysters is detected.

5. The oyster cultivation method according to claim 3, characterized in that: In step S30, the spacing between the oyster cages or oyster seed strings is greater than 400 mm, and the aquaculture water depth of the oyster cages or oyster seed strings is maintained at 0.5-2.2 m; each seed collector is provided with 10 pieces of attached shells, the spacing between the attached shells is 10 cm, and each piece of attached shells is attached with 5-30 oyster seedlings. When the oyster seedlings on the oyster seed strings grow to a shell length of 2-3 mm, several cages are moved to the aquaculture sea area; the oyster cage includes several aquaculture chambers separated by several partitions, the radius of the partitions is 15 cm, the spacing between the partitions is 15-20 cm, and 15 individual oyster seedlings are placed in each aquaculture chamber.

6. The oyster cultivation method according to claim 5, characterized in that: The step S30 includes: tying a number of seedling collectors on a cage frame, placing the cage frame into a seawater cultivation pond for culturing oyster seedlings to collect seedlings, obtaining a number of oyster seedling strings, and then attaching a net to the outside of the oyster seedling strings; the individual oyster seedlings are obtained by the following steps: placing the cage frame with the oyster seedling strings into the floating raft body for cultivation, and when the oyster seedlings on the oyster seedling strings grow to a shell length of 5-7 cm, hanging the cage frame from the floating raft body, peeling off the oyster seedlings on the oyster seedling strings, and obtaining individual oyster seedlings.

7. The oyster cultivation method according to claim 6, characterized in that: The floating pipe, connecting pipe and frame are all made of HDPE material; reinforcing material is provided inside the supporting pipe to enhance the strength of the supporting pipe.

8. A method for polyculture of fish and oysters, characterized in that: The steps include: S100. Construct a floating raft body in the aquaculture sea area, with the width direction of the floating raft body arranged in the direction of the current. The floating raft body includes a plurality of floating raft units arranged in a rectangular array. A plurality of anchor piles are evenly distributed on the seabed on both sides of the width direction of the floating raft body and connected to the width direction of the floating raft body by cables and / or anchor chains to fix the floating raft body. S200. Construct a cage frame, wherein the cage frame includes a frame body and a plurality of support tubes spaced apart on the frame body, and at least two floats are disposed below the frame body. Oyster nets are connected to the outside of the floating raft body to form a fish farming cage. S300, fixing a plurality of oyster seed strings and / or oyster cages filled with oysters to the frame body and / or support tubes of the cage rack at intervals by using cables; S400: Deploy the cages into the floating row body via a crane arm, with one cage deployed for each floating row unit, wherein the cages are detachably connected to the floating row unit, or each cage is disposed on two adjacent floating row units, with both ends of the cages respectively connected to both ends of the two adjacent floating row units; and deploy the fry into the fish farming cages for mixed fish and oyster farming; S500, management during the aquaculture period: regularly feed the fry; every 1-2 months, lift the cages out of the sea and rinse the oyster cages fixed on the cages. After rinsing, install the cages back on the floating raft body; In step S100, the floating raft body includes a truss and connecting pipes, the truss including transverse floating pipes and vertical floating pipes, a plurality of the transverse floating pipes and a plurality of vertical floating pipes are sequentially hot-melt-connected at their head and tail ends to form a truss arranged in a U-shaped or quasi-U-shaped shape, and adjacent transverse floating pipes and adjacent vertical floating pipes in the truss are arranged in parallel with each other via a plurality of connecting members; a plurality of the connecting pipes are fixedly connected to the interior of the truss, and the connecting pipes and / or the connecting pipes and the truss enclose a plurality of floating raft units arranged in a rectangular array; In step S400, the middle portion of each cage is mounted on a connecting pipe shared by two adjacent floating row units, and the two ends are respectively mounted on the two ends of the two adjacent floating row units, and at least two cages are provided for the two adjacent floating row units; and a plurality of floats are provided on the portion of the frame located within each floating row unit.

9. The method for polyculture of fish and oysters according to claim 8, characterized in that: The floating row body includes a truss and a connecting pipe. The truss includes floating tubes. Several of the floating tubes are arranged in a U-shape or a quasi-U-shape. The floating tubes are connected by hot melt. Two adjacent floating tubes are connected to each other in parallel by a number of connecting parts. The connecting pipes and / or the floating tubes enclose a plurality of floating row units arranged in a rectangular array; the connecting parts include a first bracket, and jacks are provided on both sides of the first bracket for connecting floating tubes. A handrail column is provided on the top of the first bracket, and a number of connecting holes are provided on the handrail column; the floating row body also includes a fixing pipe, which passes through the connecting holes of each first bracket in turn and is connected end to end in turn to form a rectangular frame; the top of the oyster rack net is connected to the rectangular frame, and the middle part is connected to the truss; the height of the above-water part of the oyster rack net is greater than 0.8m, and the depth of the underwater part is 3.5-4.5m.

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