Ecological cage farming method

Abstract

The present invention relates to an ecological cage aquaculture method. The method proposes a cage-based relay aquaculture model for sea cucumbers, sea urchins, and fish, wherein sea cucumbers and sea urchins are mixed in cages during the wintering period, and are combined with green pufferfish aquaculture in the summer. This achieves the comprehensive utilization of cage aquaculture, effectively avoids the risks of aquaculture of sea cucumbers and sea urchins during the high temperature period in summer, saves feeding bait, and, based on the biological characteristics of green pufferfish that feed on mollusks, removes cage attachments in a targeted manner, achieving a biological cycle and biocontrol of pollutants in marine aquaculture, reducing the labor intensity of subsequent cleaning of cage-fouling organisms. The method adopts a "well"-shaped HDPE grid cage to greatly improve the utilization efficiency of the aquaculture device. The method is equipped with an automatic feeding system to solve the problem of difficult and dangerous feeding in large cages. The method feeds bait in a scientific and standardized manner, saving feeding time and manpower input, reducing labor intensity, and greatly improving labor output efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of aquaculture, and relates to a mixed ecological cage culture mode of sea cucumbers, sea urchins, fish and the like, and in particular to an ecological cage culture method. Background Art

[0002] Sea cucumbers belong to the phylum Echinodermata, class Holothuroidea, family Stichopodidae. They are typically temperate species, suited to a sandy, gravelly bottom with a temperature of 5-20°C, a salinity of 25-35‰, and a depth of 10-30 meters, with strong currents. They primarily feed on seafloor biomass, sediment, and some algae. They typically congregate near rocks to avoid predators. In recent years, sea cucumber products have garnered widespread attention both on the dining table and in medicine, particularly following several major epidemics.

[0003] Sea urchins are a valuable seafood delicacy. Their mature gonads are plump and nutritious, making them highly sought after by consumers. Current sea urchin aquaculture primarily involves floating raft cages and small cages, requiring extensive manual feeding. In some aquaculture areas, insufficient water exchange and untimely fecal removal result in suboptimal growth. Inshore aquaculture, the large number of blue mussels that settle in summer and the high water temperatures that prevent effective cleaning have severely hampered industry development and large-scale aquaculture. Therefore, finding an efficient, ecologically sound aquaculture model to address these challenges is urgently needed.

[0004] The trend in marine aquaculture, both domestically and internationally, is towards offshore development and large-scale expansion. High-density polyethylene (HDPE) framed deepwater cages are currently the preferred choice for large-scale fish farming due to their simple structure, robustness, and ability to withstand strong winds and waves. However, single-use HDPE cages for fish farming are associated with high investment costs and slow payback rates. Improving the economic efficiency of large-scale cage aquaculture and achieving year-round cage utilization are pressing challenges for the industry. Summary of the Invention

[0005] The purpose of the present invention is to provide an ecological cage aquaculture method. It provides a cage relay aquaculture model for sea cucumbers, sea urchins, and fish. Sea cucumbers and sea urchins are mixed in cages during the winter, and are then cultured in combination with fish (green pufferfish) in the summer. This achieves the comprehensive utilization of cage aquaculture while effectively avoiding the risks of sea cucumber and sea urchin aquaculture during the high summer temperatures. Furthermore, fish aquaculture can clean mussel larvae attached to the periphery of the cages, achieving biological control in marine aquaculture and reducing the labor intensity of subsequent cleaning of fouling organisms attached to the periphery of the cages. The present invention can, on the one hand, achieve higher product returns, and on the other hand, avoid waste of resources and idle aquaculture equipment. It uses an ecological control method to effectively clean cage attachments, resulting in significant ecological benefits.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An ecological cage aquaculture method employs a circular cage with a double-layer frame structure. A double-layer "well"-shaped support is provided inside the cage. The double-layer "well"-shaped support grids the internal space of the cage to form nine aquaculture units. The cage is used for polyculture of sea cucumbers and sea urchins, and for relay aquaculture of sea cucumbers and sea urchins. The details are as follows:

[0008] (1) Cage placement

[0009] Choose an offshore area with a current lower than 1.5 knots, clear water, and abundant bait to place aquaculture cages; (2) Mixed culture of sea cucumbers and sea urchins

[0010] From October of the current year to May of the following year, sea cucumbers and sea urchins are mixed cultured in cages. In October, sea cucumber and sea urchin fry are placed in the cages. Sea urchin fry over 3.5 cm in length and 10 to 20 sea cucumber fry are selected and mixed in each culture unit. The sea urchin fry are stocked at a density of 200 to 300 per square meter, and the sea cucumber fry are stocked at a density of 10 to 20 per square meter.

[0011] After the seedlings are released, a black shade net is placed on the top of the cage and macroalgae such as kelp or wakame are fed as bait until the following year. When the sea urchins grow to a body length of more than 6 cm, a body weight of ≥ 50 g, or an average gonad index of more than 25%, they are harvested. The average gonad index = gonad weight / body weight * 100%; the sea cucumbers are harvested when they grow to a size of 4-6 heads.

[0012] (3) Relay breeding of green-finned pufferfish

[0013] After the sea cucumbers and sea urchins are harvested, green pufferfish are cultured in the cages from May to September. Pufferfish fry, 3 to 5 cm in length, are stocked at a density of 20 to 50 per cubic meter. Due to the large-scale reproduction of blue mussels and other marine mammals in summer, the juveniles attach to the surface of the cage nets and gradually grow, making them extremely difficult to clean. Pufferfish prefer to feed on bivalves, and their juveniles feed on bivalves. Therefore, green pufferfish culture allows for the removal of blue mussel juveniles attached to the nets, achieving ecological aquaculture.

[0014] When the green-fin pufferfish grows to 10cm-15cm in size and weighs 200g-400g, it is harvested using a negative pressure pump-suction underwater robot.

[0015] (4) Cage maintenance and circulation aquaculture

[0016] After the greenfin pufferfish is harvested, the cages are inspected and repaired. If the nets are damaged, they are replaced or repaired in a timely manner. In October of the same year, sea cucumber and sea urchin seedlings are released again for year-round cycle farming.

[0017] Preferably, the sea cucumbers and sea urchins are co-cultured and fed once a week, with the weight of the bait fed each time being 3-5% of the total weight of the sea urchins and sea cucumbers.

[0018] Preferably, the sea cucumbers, sea urchins and green-fin pufferfish in the cages are harvested using a negative pressure pump-suction underwater robot to avoid damage during harvesting.

[0019] Preferably, the net cage consists of a double-layer circular frame, with a net wrapped between the upper circular frame and the lower circular frame, and the lower circular frame is wrapped with a hard net to increase the support of the bottom of the net cage; a double-layer "well"-shaped bracket is arranged in the net cage, the upper "well"-shaped bracket is fixed in the plane of the upper circular frame, and the lower "well"-shaped bracket is fixed in the plane of the lower continuation frame, and a net is arranged between the double-layer "well"-shaped brackets, and the double-layer "well"-shaped brackets grid the internal space of the net cage; the upper circular frame of the net cage is made of HDPE to increase the buoyancy of the net cage; a metal ring is used inside the lower circular frame, and the lower "well"-shaped bracket is welded to the plane of the metal ring. The metal ring and the lower "well"-shaped bracket are wrapped with a polyethylene sealing tube to avoid seawater corrosion and increase the counterweight of the net cage, so that the bottom of the net cage can sink, and the net wrapped around the net cage and between the double-layer "well"-shaped brackets can be vertical up and down.

[0020] Preferably, the upper "well"-shaped bracket of the net box is detachably connected to the upper circular frame, and the net between the double-layer "well"-shaped bracket is fixed on the upper "well"-shaped bracket and detachably connected to the lower "well"-shaped bracket, which is convenient for installation, maintenance and disassembly.

[0021] Further preferably, the upper "well"-shaped bracket is bolted to the upper circular frame, and the netting between the double-layer "well"-shaped brackets is connected to the lower "well"-shaped bracket by tying with plastic tie bands.

[0022] Further preferably, the upper "well"-shaped support of the net box is a double-layer gap structure, and the "mouth"-shaped support part in the middle of the upper "well"-shaped support is provided with a net gap for the net to pass through and be fixed, and then the two ends of the net are tied to the "mouth"-shaped support part in the middle of the lower "well"-shaped support to form a double-layer net connection, and the double-layer net is fixed with multiple straps at intervals to increase the firmness of the net.

[0023] Preferably, the cage is provided with an automatic feeding system, which includes a feeding cart, which includes a bottom pulley and a top compartment, the top of the compartment is open and the side wall is provided with an automatic opening and closing compartment door; the feeding cart is mounted on an upper "well"-shaped bracket, and the surface of the upper "well"-shaped bracket is provided with a concave slide for the feeding cart to slide; pulleys are provided at both ends of the concave slide and are equipped with a traction motor, a traction rope is connected between the pulleys, and the traction rope is connected to the feeding cart, which is pulled to move along the concave slide and realizes automatic feeding by automatically opening and closing the compartment door.

[0024] Preferably, a corrugated aquaculture fixing plate is placed at the bottom of the aquaculture unit, and a plurality of water-permeable holes are provided on the corrugated aquaculture fixing plate to reduce the obstruction of the ocean current and increase its own buoyancy.

[0025] Further preferably, multiple layers are stacked in the cage to increase the attachment area and activity space of the sea cucumbers and sea urchins.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention creatively proposes a cage-based relay aquaculture model for sea cucumbers, sea urchins, and fish. Sea cucumbers and sea urchins are co-cultured in cages during the winter, with sea urchin feces used as bait for the sea cucumbers. This model, combined with summer green pufferfish aquaculture, achieves comprehensive utilization of cage aquaculture while effectively avoiding the risks of sea cucumber and sea urchin aquaculture during the high summer temperatures and conserving feed. Furthermore, based on the green pufferfish's biological characteristics of feeding on mollusks, the model specifically removes blue mussels attached to the cages, ensuring clearing of blue mussels from June to September. This achieves a biological cycle for aquaculture in the marine area and biological control of pollutants, while reducing the labor intensity of subsequent cleaning of fouling organisms from the cage periphery.

[0028] 2. The use of "well" shaped HDPE grid cage greatly improves the utilization efficiency of the breeding equipment;

[0029] 3. The upper and lower layers of the gridded cage are made of different materials, which increases the stability of the cage through its own structure and makes the aquaculture more resistant to wind and waves;

[0030] 4. Equipped with an automatic feeding system, it solves the problem of difficult and dangerous feeding in large cages. It feeds bait according to scientific standards, saves feeding time and manpower input, reduces labor intensity, and greatly improves labor output efficiency.

[0031] The present invention adopts an ecological prevention and control method to effectively clean up the attachments in the cage, has a significant ecological effect, and can obtain higher product returns. It meets the development needs of green ecological breeding and proposes an effective way for the sustainable development of the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0033] Figure 1 This is a flow chart of an ecological cage aquaculture method in Example 1 of the present invention;

[0034] Figure 2 Schematic diagram of the structure of the cage used in Example 1 of the present invention;

[0035] Figure 3 for Figure 2 Schematic diagram of the structure without the outer net of the cage;

[0036] Figure 4 for Figure 1 Schematic diagram of the structure of the automatic bait feeding system;

[0037] Figure 5 for Figure 4 The main view;

[0038] Figure 6 This is a schematic diagram of the structure of the corrugated aquaculture fixing plate in Example 1 of the present invention;

[0039] Figure 7 for Figure 6 Multi-layer stacking deployment usage status diagram;

[0040] In the figure: A. Net cage, B. Automatic feeding system, 1. Upper circular frame, 2. Net, 3. Lower circular frame, 4. Upper "well"-shaped bracket, 5. Lower "well"-shaped bracket, 6. Pulley, 7. Feeding cart, 8. Traction rope, 9. Traction motor, 10. Concave slide, 11. Net slit, 12. Automatic door. DETAILED DESCRIPTION

[0041] The present invention will be further explained below in conjunction with specific implementation plans, but the technical solutions of the present invention are not limited to these examples.

[0042] Example 1

[0043] The present invention is introduced taking the applicant's 2020 Zhangzidao cage polyculture experiment as an example.

[0044] In 2015, the applicant purchased eight sets of HDPE-framed deepwater cages. Made of HDPE, the material is resistant to pressure, acid and alkali, corrosion, and aging. The cages, with a circumference of 50 meters and a radius of 8 meters, were primarily used to culture cold-water fish such as yellowtail amberjack. In 2018, the cages became idle due to a shortage of fry, the labor-intensive and expensive maintenance of the sea area, the high number of fouling organisms, and the difficulty of feeding.

[0045] In April 2020, cage A was modified. Stainless steel upper "well"-shaped supports 4 were threaded into the plane of the upper circular frame 1. A stainless steel pipe was installed at the bottom of cage A to form a ring. A stainless steel lower "well"-shaped support 5 was welded into the ring. The outer circumference of the ring was wrapped with waterproof polyethylene material to form the lower circular frame 3. The lower "well"-shaped support 5 was then wrapped with polyethylene sealing tube to prevent seawater corrosion. The metal core of the lower circular frame 3 and the lower "well"-shaped support 5 added counterweight to cage A, allowing the bottom of cage A to sink and the net 2 wrapped around cage A and between the two "well"-shaped supports to maintain vertical support. The net 2 consists of the net 2 wrapped between the upper circular frame 1 and the lower circular frame 3, and the net 2 installed between the two "well"-shaped supports. The two "well"-shaped supports grid the interior of cage A, forming nine aquaculture units.

[0046] The net 2 between the double-layer "well" shaped brackets is fixed on the upper "well" shaped bracket 4 and is detachably connected to the lower "well" shaped bracket. The "well" shaped bracket and the net are tied with plastic ties to facilitate the disassembly of the internal structure of the cage. The structure of the modified cage A is as follows Figure 2 and Figure 3 shown.

[0047] like Figure 4 As shown, the upper "well"-shaped bracket 4 is 50 cm wide and 7 m long, and has a double-layer gap structure. The upper surface of the upper "well"-shaped bracket 4 is provided with a concave slide 10, which is 15 cm wide and is used to carry the bait-casting vehicle 7; the "mouth" bracket part in the middle of the upper "well"-shaped bracket 4 is provided with a net slit 11, which is used for the net 2 to pass through the slit and be fixed, and then the two ends of the net are tied to the "mouth" bracket part in the middle of the lower "well"-shaped bracket 5 to form a double-layer net 2 connection. The double-layer net 2 is fixed with multiple straps at intervals to increase the firmness of the net.

[0048] like Figure 4 and Figure 5As shown, the automatic baiting system B comprises a concave slide 10 on the upper "well"-shaped support 4, a baiting cart 7, pulleys 6 at both ends of the concave slide 10, a traction motor 9, and traction ropes 8 connecting the pulleys 6. The baiting cart 7 includes a bottom pulley and a top carriage. The carriage has an open top and an automatically opening and closing door 12 on the sidewall. The baiting cart 7 is pulled along the concave slide 10 by the traction rope 8, and automatically baiting is achieved by the automatic opening and closing of the door 12.

[0049] The above-mentioned modified cages are used for ecological cage culture, such as Figure 1 As shown, HDPE frame deep-water cage A is used for polyculture of sea cucumbers and sea urchins, and relay culture with green-fin pufferfish, as follows:

[0050] (1) Cage placement

[0051] The Erbiantan area of Zhangzidao was selected as the deployment area for cage A. The sea flow in this area is smooth, with a maximum current of about 1.2 knots. The sea waves in this area are small, and due to the blocking of mountains on the north and south sides, the maximum wave height in this area does not exceed 2 meters. The sea area is rich in kelp and wakame resources, which is convenient for bait acquisition and aquaculture management.

[0052] (2) Mixed culture of sea cucumbers and sea urchins

[0053] At the bottom of each breeding unit of cage A, place Figure 6 The corrugated polyethylene aquaculture anchoring board 13 shown is equipped with several permeable holes to reduce current obstruction and lower its buoyancy. The corrugated aquaculture anchoring board 13 is 50-60 cm long and 30-40 cm wide. It is evenly distributed according to the area, with a density of 0.5 boards / ㎡.

[0054] like Figure 7 As shown, the corrugated aquaculture fixing plates 13 can be used in a staggered manner, and a gap of 3 to 5 cm is set between two fixing plates to increase the attachment area and activity space of sea cucumbers and sea urchins.

[0055] In early October, when the water temperature in the sea area dropped to 15℃, 60,000 sea urchin seedlings with a body length of more than 3.5cm, with a size of about 15 heads (the size of sea cucumbers is calculated by head, that is, a few heads are called a pound, and the sea cucumber seedlings here are a size of about 15 per pound) and 4,000 sea cucumber seedlings were purchased and evenly distributed in each breeding unit of cage A, with the sea urchin seedlings stocking density of 300 pieces / ㎡ and the sea cucumber seedlings density of 20 pieces / ㎡.

[0056] After seedlings are deployed, 60 kilograms (50 jin) of macroalgae are added weekly to cage A, representing 5% of the deployed seedling weight. From October to December, the primary feed consists of sargassum and sargassum, while from January to May of the following year, kelp and wakame are added. By the end of May of the following year, the average size of the sea urchins in the cages was 6.3 cm in length and 58.3 g in weight, while the average size of the sea cucumbers was 5.5 and 90.9 g in weight. Sea urchins and sea cucumbers were harvested using a vacuum pump underwater robot. A single cage yielded a total of 446.4 kilograms (500 jin) of sea cucumbers and 3,498 kilograms (500 jin) of sea urchins, bringing the total value of cage aquaculture to 399,800 yuan.

[0057] (3) Relay breeding of green-finned pufferfish

[0058] In early June, after the sea cucumbers and sea urchins were harvested, 4,000 greenfin pufferfish fry, measuring 3.8 cm in length and 8.6 g in weight, were stocked into Cage A at a density of 20 fry / m³. The fry were placed individually into each grid, and the nets attached to the "well" frame within the cage were not recovered. Initially, they were not fed, primarily feeding on gammarids and juvenile blue mussels (Psora edulis) attached to Net 2. In summer, when blue mussels proliferate, these juveniles attach to the cage nets and grow to adult size, making them extremely difficult to remove. Greenfin pufferfish favor bivalves, and their juveniles feed on these juveniles. Therefore, greenfin pufferfish farming allows for the removal of blue mussel larvae from the nets, achieving ecological aquaculture.

[0059] In mid-July, when the fry grew to a size of 6cm to 7cm, they began to be fed with by-products of Hokkaido scallop processing and crushed fresh blue mussels as bait; until the end of September, when the fry grew to 10cm to 15cm and weighed more than 200g, they were harvested using a negative pressure pump-suction underwater robot. A single cage produced 1,235 kilograms of adult green-fin pufferfish, with a production value of approximately 36,000 yuan.

[0060] (4) Cage maintenance and circulation aquaculture

[0061] After the greenfin pufferfish is harvested, the cages are inspected and repaired. If the nets are damaged, they are replaced or repaired in a timely manner. In October of the same year, sea cucumber and sea urchin seedlings are released again for year-round cycle farming.

[0062] This ecological cage culture method, which involves mixed and relay farming of sea cucumbers, sea urchins, and fish, eliminates the need for cage replacement and cleaning during the culture cycle, reducing labor costs and operational intensity. Within a year, a 200-square-meter cage can produce over 400 kilograms of sea cucumbers, approximately 4,000 kilograms of sea urchins, and over 1,200 kilograms of fish. This increases culture efficiency by over 50% compared to conventional cages, boosting returns by 120%.

[0063] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the scope of the present invention.

Claims

1. An ecological cage culture method, characterized in that: A double-layer frame structure is used for circular cages. Double-layer "well"-shaped supports are set up inside the cages. The double-layer "well"-shaped supports grid the internal space of the cages to form 9 breeding units. The cages are used for polyculture of sea cucumbers and sea urchins, and for relay breeding with green-fin pufferfish. The details are as follows: Cage placement Choose an offshore area with a current lower than 1.5 knots, clear water, and abundant bait to place aquaculture cages; (2) Mixed culture of sea cucumbers and sea urchins From October of the current year to May of the following year, sea cucumbers and sea urchins are mixed cultured in cages. In October, sea cucumber and sea urchin fry are placed in the cages. Sea urchin fry over 3.5 cm in length and 10 to 20 sea cucumber fry are selected and mixed in each culture unit. The sea urchin fry are stocked at a density of 200 to 300 per square meter, and the sea cucumber fry are stocked at a density of 10 to 20 per square meter. After the seedlings are released, a black shade net is placed on the top of the cage and kelp or wakame is fed as bait until the following year. When the sea urchins grow to a body length of more than 6 cm, a body weight of ≥50 g, or an average gonad index of more than 25%, they are harvested. The average gonad index = gonad weight / body weight * 100%; the sea cucumbers are harvested when they grow to a size of 4 to 6. (3) Relay breeding of green-finned pufferfish After the sea cucumbers and sea urchins are harvested, green pufferfish are cultured in the cages from May to September. Pufferfish fry, 3 to 5 cm in length, are stocked at a density of 20 to 50 per cubic meter. These juveniles feed on juvenile shellfish attached to the cage nets, keeping the nets clean. Pufferfish are harvested when they reach 10 to 15 cm in length and weigh 200 to 400 grams. Cage maintenance and circulation aquaculture After the greenfin pufferfish is harvested, the cages are inspected and repaired. If the nets are damaged, they are replaced or repaired in a timely manner. In October of the same year, sea cucumber and sea urchin seedlings are released again for year-round cycle farming.

2. The ecological cage culture method according to claim 1, characterized in that: The sea cucumbers and sea urchins are co-cultured and fed once a week, with the weight of the bait each time being 3-5% of the total weight of the sea urchins and sea cucumbers.

3. The ecological cage culture method according to claim 1, characterized in that: The sea cucumbers, sea urchins and green-fin pufferfish in the cage are harvested by using a negative pressure pump-suction underwater robot.

4. The ecological cage culture method according to claim 1, characterized in that: The net cage includes a double-layer circular frame, with a net wrapped between the upper circular frame and the lower circular frame, and the lower circular frame is wrapped with a hard net to increase the bottom support of the net cage; a double-layer "well"-shaped bracket is arranged in the net cage, the upper "well"-shaped bracket is fixed in the plane of the upper circular frame, and the lower "well"-shaped bracket is fixed in the plane of the lower continuation frame, and the net is arranged between the double-layer "well"-shaped brackets, and the double-layer "well"-shaped brackets grid the internal space of the net cage; the upper circular frame of the net cage is made of HDPE, and the interior of the lower circular frame adopts a metal ring, the metal ring is welded to the lower "well"-shaped bracket on the plane, and the metal ring and the lower "well"-shaped bracket are wrapped with a polyethylene sealing tube to prevent seawater corrosion and increase the weight of the net cage.

5. The ecological cage culture method according to claim 1, characterized in that: The cage is provided with an automatic feeding system, which includes a feeding cart, which includes a bottom pulley and a top compartment, the top of the compartment is open and the side wall is provided with an automatically opening and closing compartment door; the feeding cart is mounted on an upper "well"-shaped bracket, and the surface of the upper "well"-shaped bracket is provided with a concave slide for the feeding cart to slide, pulleys are provided at both ends of the concave slide and a traction motor is provided, a traction rope is connected between the pulleys, and the traction rope is connected to the feeding cart, the feeding cart is pulled to move along the concave slide, and automatic feeding is achieved by automatically opening and closing the compartment door.

6. The ecological cage culture method according to claim 1, characterized in that: The upper "well"-shaped bracket of the net box is detachably connected to the upper circular frame, and the net between the double-layer "well"-shaped brackets is fixed on the upper "well"-shaped bracket and detachably connected to the lower "well"-shaped bracket, which is convenient for installation, maintenance and disassembly.

7. The ecological cage culture method according to claim 6, characterized in that: The upper "well"-shaped bracket is bolted to the upper circular frame, and the netting between the double-layer "well"-shaped brackets is connected to the lower "well"-shaped bracket by using plastic cable ties.

8. The ecological cage culture method according to any one of claims 4 to 7, characterized in that: The upper "well"-shaped support of the net box is a double-layer gap structure. The "mouth"-shaped support part in the middle of the upper "well"-shaped support is provided with a net gap for the net to pass through and be fixed. Then the two ends of the net are tied to the "mouth"-shaped support part in the middle of the lower "well"-shaped support to form a double-layer net connection. The double-layer net is fixed with multiple straps at intervals.

9. The ecological cage culture method according to claim 1, characterized in that: A corrugated aquaculture fixing plate is arranged at the bottom of the aquaculture unit, and a plurality of water-permeable holes are arranged on the corrugated aquaculture fixing plate.

10. The ecological cage culture method according to claim 9, characterized in that: The mesh is stacked in multiple layers in the cage.

Images