Controllable underwater natural ecological enrichment method and system for groupers

Abstract

The invention relates to a controllable underwater natural ecological cultivation method and system for groupers, macroalgae, meat blocks and mainly cultivated grouper fries are put into a fish house, lobsters, siganus and sparidae fishes for ecological control are continuously put into the fish house, a controllable natural ecological system is formed by relying on internal related facilities of the fish house, and after the controllable ecological system is stable, the groupers are cultivated in the fish house. A one-way food chain of the epinephelus can be formed, and the epinephelus performs ecological cultivation increasing by ingestion of natural bait entering the fish house ecological system; except for feeding artificial bait when an early ecological system is not stable, only an underwater automatic feeding device needs to be used for feeding a small amount of phagostimulant in the system every 3-5 days at ordinary times to attract external bait organisms to enter the system, artificial bait feeding is not needed, and the fish house is hoisted after about 250 days to collect and catch fish. A controllable fish house ecological system is utilized, one-way food chain ecology suitable for the groupers is formed, the whole cultivation period of the groupers can be monitored in the whole process, cost is low, and economic benefits are good.

Description

Technical Field

[0001] This invention relates to the field of grouper aquaculture technology, and in particular to a controllable underwater natural ecological aquaculture method and system for grouper. Background Technology

[0002] The state has proposed the strategic goal of developing blue ocean resources and promoting deep-sea aquaculture, and is carrying out large-scale deep-sea aquaculture of economic fish species. The deep-sea area boasts a favorable ecological environment and excellent water quality, making it ideal for fish growth. However, the upper surface of the deep-sea area is characterized by high winds, rough waves, and strong currents, making it unsuitable for biological survival under natural conditions. The lower seabed, on the other hand, is relatively calm and suitable for various organisms. Even in nearshore areas, where the sea is relatively calm, full utilization of the seabed ecosystem for value enhancement is possible. Furthermore, this value enhancement does not require feeding, thus avoiding environmental pollution and ensuring the reliable quality of aquatic products.

[0003] Therefore, the project designs a controlled underwater ecological aquaculture method for grouper, which not only provides a suitable living space for low-value small wild marine organisms on the seabed, but also attracts them into the fish house as natural food for the controlled aquaculture of high-value large and medium-sized grouper, thus achieving the goal of large-scale scientific utilization of the deep sea. Summary of the Invention

[0004] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a method and system for the controlled underwater ecological aquaculture of grouper that allows for natural growth, is environmentally friendly and reliable.

[0005] This invention provides a controlled underwater natural ecological aquaculture method for grouper.

[0006] Large algae and chunks of meat are placed inside a semi-enclosed fish house. The fish house is then placed in the sea area near the marine aquaculture net cages. Grouper fry, which are the main species being cultured, are released into the water while the fish house is partially suspended in the sea. The fry are 15-20cm in length, and the density is approximately 20-30 fry / m³.

[0007] Continue to stock the fish house with a mix of basketfish, golden threadfin bream, lobsters, and sea bream.

[0008] The stocking ratio of basket fish, lobsters, and sea bream to grouper fry was 1-2:100.

[0009] The ratio of juvenile golden coin fish to grouper fish is 1:200;

[0010] The lobsters, basketfish, and sea bream are slightly larger in length than the grouper.

[0011] After deployment, seal the fish house and sink it into the sea;

[0012] During the breeding process: artificial feed is automatically fed in the fish house every day. The weight of the artificial feed is 3%-5% of the current weight of the grouper fry, and it is fed for 15-20 days.

[0013] Once the fish house has established a stable underwater natural ecosystem, artificial feed will no longer be provided; instead, biological attractants will be introduced.

[0014] Grouper fry are raised until they reach a length of 20-30cm and a weight of 1.0-1.5kg, then harvested by hanging them from the fish house.

[0015] The grouper fry were released at staggered intervals with basketfish, golden bream, lobster, and sea bream. 15-40 minutes after releasing the grouper fry, basketfish, golden bream, lobster, and sea bream were released. The growth rates of the mixed-species organisms were as follows: basketfish 0.5 cm / month, sea bream 0.5 cm / month, lobster 0.3 cm / month. The growth rate of the grouper exceeded that of the mixed-species organisms, and was 1.0-1.8 cm / month, ensuring that the grouper's body length was always greater than or equal to that of the mixed-species organisms throughout the breeding cycle.

[0016] The artificially formulated feed consists of 55% fish meal, 15% shrimp meal, 10% soybean meal, 15% wheat flour, 3% vitamin premix, and 2% mineral premix.

[0017] The artificially formulated feed is made into 2-3 mm pellets with a nutritional profile of 55-60% crude protein and 8-12% crude fat. The feeding times are 8:00 AM and 6:00 PM.

[0018] After 20-30 days of stocking grouper fry, the underwater natural ecosystem is established. The biological attractant is a mixture of allicin, vitamin E, and small-particle artificial feed. The amount of feed is 40-80 ml per cubic meter of water, and it is fed every 3-5 days.

[0019] The amount of large algae added is 5-8 kg per cubic meter of water, and the amount of meat chunks is 5-8 kg per cubic meter of water.

[0020] A controllable underwater natural ecological aquaculture system for grouper includes a fish house, which is set in the seawater at a distance of 15-20 meters from one side of the seawater aquaculture net cage;

[0021] The fish house includes a hollow frame, which comprises four pillars, a bottom pillar, and a top pillar. The pillars are connected at the top by the top pillar and at the bottom by the bottom pillar. Openings are provided on the sides of the hollow frame. The frame contains a hollow cavity, and an escape-proof net is provided on the outside of the frame, covering the openings.

[0022] Artificial reef units are set in the middle of the frame, with a volume of 0.3~0.4 cubic meters per unit, and a total of 4~6 units. They are made of PVC-U pipes with an inner diameter of 5~7cm and a length of 12~15cm, bundled together in groups of 10.

[0023] The lighting unit includes an underwater fish-attracting LED light, which is suspended below the top column and emits white and green light to attract small fish and generate fish-attracting light. The light is automatically controlled to turn off during the day and turn on at night, continuing for one breeding cycle.

[0024] A large habitat area, set within a frame and secured to bottom posts, is provided for grouper to inhabit.

[0025] The automatic feeding unit, located above the frame, is used to dispense biological attractants and artificially formulated feed.

[0026] The columns, bottom columns, and top columns are made of corrosion-resistant cement. The hollow frame has a volume of 70-100 cubic meters and is made of 42.5R silicate cement with 5% salt-resistant agent.

[0027] The escape-proof netting is made of polyethylene with a wire diameter of 2mm and a tensile strength of ≥500N. It is fixed to the frame by the wire mesh.

[0028] The large habitat area includes 300-400 horizontally arranged cylindrical tubes with an inner diameter of 10-15 cm and a length of 40-50 cm, located within a hollow cavity.

[0029] A controllable underwater natural ecological aquaculture system for grouper, wherein the automatic feeding unit includes a feed bin with a feeding port and a feeder inside the feed bin with a feed rate of 10~100ml / min.

[0030] Beneficial effects:

[0031] The present invention relates to a method for constructing and raising a controllable ecosystem for grouper based on a fish house, which differs from existing multi-level nutrient aquaculture systems and escape-proof net cage aquaculture. By utilizing a controllable ecosystem, a unidirectional food chain ecosystem suitable for grouper is formed. During the grouper raising period, the food mainly comes from small marine prey organisms that are attracted into the fish house by the functions of the fish house system to forage and inhabit. The entire production cycle of grouper can be monitored, with no pollution or disease, and high economic value.

[0032] The main advantages are:

[0033] (1) The space of the aquaculture farmers is fully utilized. The surface part can be used for aquaculture production, and the underwater part can be used for value-added aquaculture. The ecological three-dimensional use of space increases the benefits. In addition, the grouper ecosystem of the present invention can also effectively deal with the water conditions under the escape-proof net cages of deep-water aquaculture and reduce diseases.

[0034] Lobsters, basketfish, and snapper can effectively remove algae, shellfish, and other pollutants that accumulate on the escape-proof netting, keeping the water flowing smoothly and in good condition inside the fish house.

[0035] (2) The grouper with added value is ecologically healthy. Compared with conventional farming methods, only a small amount of feed needs to be fed to the fry in the early stage to establish the initial form of the fish school. Then, the natural water environment can be used to attract small marine organisms from the surrounding area to enter the fish house as natural biological food for the grouper to increase its population. It is not afraid of extreme weather such as typhoons and storms, has low management costs, and is highly operable.

[0036] (3) The products of the aquaculture grouper are naturally grown in the ecological environment, with high quality, no drug residues, and are green and environmentally friendly.

[0037] (4) It can also catch natural fish in the ecological environment to obtain multi-level benefits (what does this mean, I don't understand), including deep-water escape-proof cage benefits, value-added grouper benefits, and natural fish benefits.

[0038] (5) Bassfish, golden coin fish, lobster and sea bream are mixed together. The size of the lobster, basketfish and sea bream is slightly larger than that of the grouper. The sea bream can remove the attached organisms of the escape net and the fish house, maintain the stability of the internal environment and promote the exchange of substances with the outside. Lobster, basketfish, golden coin fish and other fish can feed on the excessive growth of large algae, benthic algae and barnacles, oysters and mussels and other polluting organisms, and maintain the stability of the internal ecology of the fish house.

[0039] In terms of environmental protection, the fish house is located above a conventional deep-sea cage aquaculture system. Small marine organisms that cluster around the deep-sea cages can enter the fish house and be utilized by the grouper, promoting ecological circulation.

[0040] By staggering the release times, smaller grouper fry can avoid damage from fish such as wrasse, pufferfish, lobsters, and sea bream during the initial release period, thus improving the fry survival rate.

[0041] Because grouper grows relatively quickly, the basket fish, croaker, lobster, and sea bream that are released early on must be larger than the grouper to prevent them from being eaten later.

[0042] Lobsters at the bottom, basketfish in the middle, and sea bream are mixed together, making full use of the three-dimensional space. The tubular habitat arranged around the perimeter is low in production cost, not easily damaged by bottom-dwelling fish and lobsters, and can be reused.

[0043] Artificial reefs and large habitats can provide sufficient hiding and habitat space for different fish species within the ecosystem, thus ensuring ecosystem stability.

[0044] The design of the escape-prevention net can effectively prevent the escape and loss of economically valuable fish such as lobsters and other large catches inside the fish house. Attached Figure Description

[0045] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the structure of the present invention;

[0047] Figure 2 This is a cross-sectional view of the present invention;

[0048] Figure 3 This is a top sectional view of the present invention.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1 – Frame, 2 – Large habitat area, 3 – Light control unit, 4 – Artificial reef unit, 5 – Automatic feeding unit, 6 – Escape prevention net. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0052] It should be noted that the descriptions involving "first," "second," etc., in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0053] Example 1, Example 2 (Southern region, Zhanjiang sea area, Guangdong)

[0054] Fish house placement: On April 10, 2023 (water temperature 22℃), a hollow frame fish house with a volume of 80 cubic meters (8m long × 5m wide × 2m high) was placed and fixed 8m away from one side of the marine aquaculture cage.

[0055] Fish fry stocking: On April 11, 15cm long grouper fry were stocked at a density of 30 fish / m³; 30 minutes later, mixed-species fish were stocked: 240 yellow-spotted basketfish (17cm long), 240 spiny lobsters (17cm long), 240 black sea bream (17cm long), and 120 golden coin fish (16cm long).

[0056] Initial feeding: From April 11 to April 30, feed artificial feed at 8:00 am and 6:00 pm every day. The initial feeding amount is 4% of the weight of the grouper fry.

[0057] Ecological stabilization and attractant introduction: After 20-30 days of stocking grouper fry, the underwater natural ecosystem is established. Biological attractants are introduced into the fish house every 3-5 days.

[0058] The fish houses are typically introduced in April in the south, and slightly later in the north. In the north, the introduction of fish houses is delayed by one month.

[0059] Example 2 (Northern region, Qingdao sea area, Shandong)

[0060] Fish house placement: On May 15, 2023 (water temperature 19℃), a hollow frame fish house with a volume of 70 cubic meters (7m long × 5m wide × 2m high) was placed and fixed 5m away from one side of the marine aquaculture cage.

[0061] Fish fry stocking: On May 16, grouper fry with a body length of 18cm were stocked at a density of 20 fish / m³ (total of 1400 fish); 15 minutes later, mixed-species fish were stocked: 280 yellow croaker (body length 20cm), 280 spiny lobsters (body length 20cm), 280 black sea bream (body length 20cm), and 140 golden coin fish (body length 19cm).

[0062] Initial feeding: From May 16 to June 5, feed artificially formulated feed daily at a rate of 3.5% of the grouper fry's body weight.

[0063] Ecological stability and attractant application: Determine ecological stability; starting from the day of application, apply biological attractant once every 3 days, with each application amount being 70m³ × 50mL / m³ = 3.5L.

[0064] The fish houses are introduced in May in the south, and slightly later in the north. In the north, the introduction of fish houses is two months later.

[0065] The ecosystem establishment evaluation indicators for Examples 1 and 2 above are: evaluating the water quality of the fish house, the biological community within the fish house, the ecological function of the fish house, and the stability of the fish house system. The evaluation indicators are:

[0066]

[0067] Biological community structure and food function indicators (measures of ecological food chain efficiency)

[0068]

[0069] System stability and operational indicators

[0070] .

[0071] Example 3

[0072] A controlled underwater natural ecological aquaculture system for grouper includes a fish house located in the seawater below a marine aquaculture net cage.

[0073] The fish house includes a hollow frame 1, which comprises four pillars, a bottom pillar, and a top pillar. The pillars are connected at the top via the top pillar and at the bottom via the bottom pillar. Openings are provided on the sides of the hollow frame 1. The interior of the hollow frame 1 is a hollow cavity. An escape-proof net 6 covers the outside of the frame, enclosing the openings in the hollow frame 1. The escape-proof net 6 has a mesh size of 3-5.

[0074] Artificial reef unit 4 is set within the frame;

[0075] Light generating unit 3 is fixed to the top column and suspended below the top column to generate fish-attracting lights;

[0076] Large habitat area 2, located within a frame and fixed to bottom posts, is used for grouper habitat.

[0077] The automatic feeding unit 5, located within the hollow frame, is used to dispense biological attractants.

[0078] The hollow frame 1 is made of corrosion-resistant cement and has a volume of 70-100 cubic meters.

[0079] The fish house is set up in the seawater below and beside the marine aquaculture net cage. The bottom of the net cage usually has a supporting structure, and the fish house is located beside this supporting structure, at a distance of 5-8m from the bottom of the net cage. The fish house includes a hollow frame, and the hollow frame 1 consists of four columns, a bottom column, and a top column.

[0080] The columns, base columns, and top columns are all made of corrosion-resistant cement (grade 42.5R silicate cement with 5% added salt-resistant agent). Half of the design is as follows: the column diameter is 30cm and the height is 5~6m, the base column and the top column diameter is 20cm and the length is 4~5m. The columns are connected by welding at the top and at the bottom through welding at the bottom, forming a rectangular frame with a volume of 70~100 cubic meters (preferably 80 cubic meters, dimensions: length 8m × width 5m × height 2m).

[0081] The sides of the hollow frame 1 are "semi-enclosed structure": the top is fully enclosed (cement board, 10cm thick, with reserved feeding and monitoring ports), the enclosed area of ​​the four sides accounts for 70% (cement board, 8cm thick), and the remaining 30% is set with openings (2 on each side, each opening is 0.8m×1.2m in size).

[0082] The hollow frame 1 is fully covered by an escape-proof net 6. The escape-proof net 6 has a mesh count of 3 to 5 (corresponding to an aperture of 5 to 8 mm, material: polyethylene anti-corrosion net, wire diameter 2 mm, tensile strength ≥ 500 N).

[0083] The escape-proof net 6 is fixed to the hollow frame 1 by 304 stainless steel bolts (8mm in diameter, 20cm spacing) or wire mesh.

[0084] The gaps between the mesh edge and the hollow frame 1 are sealed with neoprene strips to ensure that: economic animals (grouper, lobster) inside the fish house cannot escape, large and ferocious creatures (carnivorous fish with a body length > 5cm) cannot enter, and small prey creatures (body length < 3cm) can enter freely.

[0085] The automatic feeding unit 5 includes a hopper with a feeding port and a discharge device inside the hopper, which is used to deliver the biological attractant to the feeding port for output.

[0086] Located at the top center of the frame, it automatically adjusts the feeding amount; the top of the hopper is equipped with a sealed cover to prevent seawater from entering.

[0087] The artificial reef unit 4 has a volume of 0.3-0.4 cubic meters and is composed of several seawater-resistant PVC-U pipes with an inner diameter of 5-7 cm, a length of 12-15 cm, and a wall thickness of 3 mm. Multiple pipes are bundled together to form an artificial reef, which is then fixed with 304 stainless steel wire (diameter 2 mm) at 5 cm intervals to form a honeycomb structure. Both ends of the pipes are open to facilitate the entry and exit of grouper, and the bottom of each bundle of reefs is fixed to the bottom column of the frame through a cement base to prevent displacement.

[0088] Located in the central area within the hollow frame 1, these artificial reefs are designed for grouper (especially those in the 15-25cm size) to hide and inhabit. Each fish house contains 4-6 reefs, evenly distributed. The artificial reefs consist of several seawater-resistant PVC-U pipes, each with an inner diameter of 5-7cm and a length of 12-15cm, with a wall thickness of 3mm.

[0089] The large habitat area 2 includes 300-400 round tubes with an inner diameter of 10-15 cm and a length of 40-50 cm, arranged horizontally with a spacing of 10 cm, and fixed to the base column by stainless steel brackets; each tube is open at both ends, and 1-2 protrusions (2 cm high) are set inside the tube to facilitate lobster climbing and resting; the fiberglass tubes are arranged in the same direction as the seawater flow to reduce water flow resistance and facilitate the discharge of uneaten food and feces.

[0090] Large habitat area 2 is set at the bottom perimeter within the hollow frame 1 and fixed to the bottom post, for large fish (such as 25-30cm grouper) and lobsters to inhabit;

[0091] The light generating unit 3 includes an underwater fish-attracting LED light, which is suspended from the top column and emits white and green light to attract small fish.

[0092] Fixed below the top post, one is suspended from each top post, for a total of four, used to attract small prey organisms (such as krill and mysids) at night.

[0093] The LED light can emit white light (wavelength 450~460nm) and green light (wavelength 520~530nm), with both colors emitting light simultaneously (experiments have shown that this combination attracts prey organisms 40% more effectively than a single color). The timer controller is set to emit light from 19:00 at night to 5:00 the next day and turn it off during the day to reduce energy consumption.

[0094] Artificial reef unit 4 and large habitat area 2 provide habitats for grouper in the early, middle, and late stages of their life cycle, ensuring a stable growth environment and providing space for them to inhabit and hunt. The cylindrical design of large habitat area 2 also facilitates later harvesting and cleaning of the fish house.

[0095] The arrangement of the surrounding frame 1 allows for more space to be arranged within a limited area, increasing the breeding space for grouper and allowing for a greater number of fish to be raised per unit volume, thereby increasing profits.

[0096] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for controlled underwater natural ecological aquaculture of grouper, characterized in that: Large algae and chunks of meat are placed inside a semi-enclosed fish house covered with netting. The fish house is then placed in the sea area near the marine aquaculture cages. Grouper fry, which are the main species being cultured, are released into the water while the fish house is partially suspended in the sea. The fry are 15-20cm in length, and the density is approximately 20-30 fry / m³. Continue to stock the fish house with a mix of basketfish, golden threadfin bream, lobsters, and sea bream. The stocking ratio of basket fish, lobsters, and sea bream to grouper fry was 1-2:

100. The ratio of juvenile golden coin fish to grouper fish is 1:200; The lobsters, basketfish, and sea bream are slightly larger in length than the grouper. After deployment, the fish house is sealed with netting and sunk into the sea; During the breeding process: artificial feed is automatically fed in the fish house every day. The weight of the artificial feed is 3%-5% of the current weight of the grouper fry, and it is fed for 15-20 days. Once the fish house has established a stable underwater natural ecosystem, artificial feed will no longer be provided; instead, biological attractants will be introduced. Grouper fry are raised until they reach a length of 20-30cm and a weight of 1.0-1.5kg, then harvested by hanging them from the fish house.

2. The method for controlled underwater natural ecological aquaculture of grouper according to claim 1, characterized in that: The grouper fry were released at staggered intervals with basketfish, golden bream, lobster, and sea bream. 15-40 minutes after releasing the grouper fry, basketfish, golden bream, lobster, and sea bream were released. The growth rates of the mixed-species organisms were as follows: basketfish 0.5 cm / month, sea bream 0.5 cm / month, lobster 0.3 cm / month. The growth rate of the grouper exceeded that of the mixed-species organisms, and was 1.0-1.8 cm / month, ensuring that the grouper's body length was always greater than or equal to that of the mixed-species organisms throughout the breeding cycle.

3. The method for controlled underwater natural ecological aquaculture of grouper according to claim 1, characterized in that: The artificially formulated feed consists of 55% fish meal, 15% shrimp meal, 10% soybean meal, 15% wheat flour, 3% vitamin premix, and 2% mineral premix. The artificially formulated feed is made into 2-3 mm pellets with a nutritional profile of 55-60% crude protein and 8-12% crude fat.

4. The method for controlled underwater natural ecological aquaculture of grouper according to claim 3, characterized in that: After 20-30 days of stocking grouper fry, the underwater natural ecosystem is established. The biological attractant is a mixture of allicin, vitamin E, and small-particle artificial feed. The amount of feed is 40-80 ml per cubic meter of water, and it is fed every 3-5 days.

5. The method for controlled underwater natural ecological aquaculture of grouper according to claim 1, characterized in that: The amount of large algae added is 5-8 kg per cubic meter of water, and the amount of meat chunks is 5-8 kg per cubic meter of water.

6. A controlled underwater natural ecological aquaculture system for grouper using the method of any one of claims 1 to 5, characterized in that: This includes fish houses, which are set up in the seawater at a distance of 15-20 meters from the side of the marine aquaculture cages; The fish house includes a hollow frame, which comprises four pillars, a bottom pillar, and a top pillar. The pillars are connected at the top by the top pillar and at the bottom by the bottom pillar. Openings are provided on the sides of the hollow frame. The frame contains a hollow cavity, and an escape-proof net is provided on the outside of the frame, covering the openings. Artificial reef units are located in the middle of the frame and are made of PVC-U pipes with an inner diameter of 5-7cm and a length of 12-15cm, bundled together in multiple sections. The lighting unit includes an underwater fish-attracting LED light, which is suspended below the top column to attract small fish and generate fish-attracting light. The light is automatically controlled to turn off during the day and turn on at night, continuing for one breeding cycle. A large habitat area, set within the frame and fixed to bottom posts, is used for grouper to inhabit. An automatic feeding unit, located above the frame, is used to deliver biological attractants and artificially formulated feed.

7. A controllable underwater natural ecological aquaculture system for grouper according to claim 6, characterized in that: The columns, bottom columns, and top columns are made of corrosion-resistant cement. The hollow frame has a volume of 70-100 cubic meters and is made of 42.5R silicate cement with 5% salt-resistant agent.

8. A controllable underwater natural ecological aquaculture system for grouper according to claim 6, characterized in that: The escape-proof net is made of polyethylene with a wire diameter of 2mm and a tensile strength of ≥500N. It is fixed to the frame by the wire mesh.

9. A controllable underwater natural ecological aquaculture system for grouper according to claim 5, characterized in that: The large habitat area includes 300-400 horizontally arranged cylindrical tubes with an inner diameter of 10-15 cm and a length of 40-50 cm, located within a hollow cavity.

10. A controllable underwater natural ecological aquaculture system for grouper according to claim 5, characterized in that: The automatic feeding unit includes a hopper with a feeding port and a feeder inside the hopper. The hopper has a volume of 500L and the feeder discharges 10~100ml / min.

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