Breeding method for weever

Abstract

The invention discloses a weever culture method, and relates to the technical field of weever culture, and the method comprises the following steps: S1, selecting a non-saline-alkali sea water area with salinity of 28-32% o and dissolved oxygen of more than or equal to 6mg / L, arranging a mangrove forest / sea grass protection zone with the width of 50m, carrying out nano-catalysis electrolysis disinfection, aerating, and neutralizing residual chlorine; s2, building a 8m * 8m * 5m net cage by using an HDPE (High-Density Polyethylene) frame, dynamically adjusting meshes according to fish bodies, and arranging a protective net, sinkers and buoys; s3, healthy seedlings with the length larger than or equal to 3.5 cm are selected, vitamin C and astragalus polysaccharide are added before transportation, temperature and salt are adjusted before the seedlings are put into a box, and stocking is conducted according to specifications after temporary rearing; s4, feeding feeds with different protein and fat contents in stages, feeding a compound microbial preparation, performing PCR (Polymerase Chain Reaction) detection on diseases, and performing targeted medication; s5, when 1.0-1.5 kg per tail is obtained, harvesting is conducted in a small tide water period, and temperature-controlled salt-oxygen transportation is conducted through a flowing water ship. The method has the advantages of wind wave resistance, few diseases, simple process and adaptation to natural sea areas.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sea bass culture, in particular to a culture method for sea bass. BACKGROUND

[0002] As a euryhaline valuable economic fish, the artificial culture technology of sea bass has become a research hotspot in recent years, Prior art: a culture method for parent fish of Plectropomus leopardus (publication number: CN114982676B) This technology focuses on the breeding of Plectropomus leopardus parent fish, and the core is the "temporary pond sterilization + acclimation feed + double-layer net cage" scheme, but it is only suitable for parent fish cultivation and cannot be directly applied to the large-scale culture of sea bass for sale: Prior art: a method for desalination culture of marine fish (publication number: CN114009375A) This technology takes "salinity step-down" as the core, aiming to introduce marine fish into inland saline water for culture, which is completely different from the sea culture scenario of the present application, and requires the setting of more than 10 salinity steps, which is complex to operate and only suitable for saline water, and cannot be directly used for sea bass culture in natural seawater; Prior art: an intensive ecological culture method for Plectropomus nebulosus (publication number: CN104686427A) This technology is a pond ecological culture, and the core is "biological membrane fish nest + pond micro-ecological construction", which cultivates plankton by biological membrane fish nest and artificial fertilization, and cannot adapt to the dynamic water flow and open environment in the sea, and the structure design of the biological membrane fish nest is easily damaged by wind and waves in the sea. SUMMARY

[0003] The purpose of the present application is to provide a culture method for sea bass, in particular a culture method for sea bass.

[0004] To achieve the above purpose, the present application provides the following technical scheme: a culture method for sea bass, comprising the following steps: S1, pre-treatment of the culture sea area: select a non-saline seawater area with salinity of 28-32‰ and dissolved oxygen of ≥6mg / L, 30 days before releasing sea bass fry, set a 50m wide mangrove / seagrass ecological protection belt around the sea area, and use nano catalytic electrolysis technology to disinfect the local water body in the culture area, after aeration for 12 hours and neutralization of sodium thiosulfate to residual chlorine <0.05mg / L, it is ready for use; S2, net cage setting: 8m x 8m x 5m net cage is built by HDPE frame, the main body of the net cage is knot-free polyethylene mesh, the mesh is dynamically adjusted according to the length of the fish, 0.8-1.0cm when the body length is 3-5cm, 1.2-1.5cm when the body length is 5-10cm, 2.0-2.5cm when the body length is >10cm, 5-8cm mesh nylon protective net is added to the outer layer of the net cage, 6 300-400kg concrete sinkers are arranged at the bottom, and 10 HDPE floating buoys with ≥500kg buoyancy are connected by 8 15-20mm steel cables at the top; S3, seed pretreatment and stocking: healthy perch fry with a body length of ≥3.5cm are selected, 50-80mg / L vitamin C and 30-50mg / L astragalus polysaccharide are added to the original water body 2 days before transportation; the temperature difference between the transportation water and the breeding sea area is ≤2℃, the salinity difference between the mixed transportation water and the breeding seawater is ≤1‰ before entering the cage, and the salinity difference is ≤1‰ after temporary breeding for 5-7 days, 300-350 tails / m³ when the body length is 3-5cm, 250-300 tails / m³ when the body length is 5-10cm, and 150-200 tails / m³ when the body length is >10cm; S4, feeding and disease prevention and control: compound feed is fed according to the length of the perch, ≥48% protein when the body length is 3-10cm, 45-48% protein when the body length is 10-20cm, and 42-45% protein when the body length is >20cm, 2-4 times a day, and the feeding amount is 2-8% of the total weight of the fish; 10-15g / m³ of compound microbial preparation is added to the water every 10-15 days, the perch pathogen is detected by PCR, 6% albendazole powder is fed at 0.2-0.3g / kg·bw for 5-7 consecutive days when trichodiniasis is diagnosed, and florfenicol powder is fed at 12-15mg / kg·bw for 3-5 consecutive days when ulcer disease is diagnosed; S5, harvest and transportation of adult fish: when the body weight of the perch is 1.0-1.5kg / tail, a 4-5cm mesh nylon net is used to harvest in the small tide period; live water ship is used for transportation.

[0005] Further, after the nano-catalytic electrolysis disinfection in S1, the chemical oxygen demand (COD) and the total number of coliform bacteria in the local water body of the breeding area need to be detected to ensure that the COD is ≤3mg / L and the total number of coliform bacteria is ≤100 / L, and then aeration and residual chlorine neutralization operation is performed.

[0006] Further, the adjacent rod members of the HDPE frame in S2 are connected by stainless steel bolts, and the surface of the bolt is sprayed with an epoxy resin anticorrosive coating (thickness 50-80μm); 10 HDPE floating buoys are evenly distributed in a ring shape along the top frame of the net cage, and the distance between adjacent floating buoys is 2-2.5m.

[0007] Further, the S3 in the process of temporary culture in S3 is added with fermented brine shrimp by probiotics, the probiotics are mixed bacteria of bacillus subtilis and saccharomyces cerevisiae, and the weight ratio of the two is 1:0.5-0.8; the fermentation process is controlled at a temperature of 30-32 DEG C, a pH value of 6.8-7.2, and a fermentation time of 24-36 hours.

[0008] Further, the S4 in the process of temporary culture in S3 is added with fermented brine shrimp by probiotics, the probiotics are mixed bacteria of bacillus subtilis and saccharomyces cerevisiae, and the weight ratio of the two is 1:0.5-0.8; the fermentation process is controlled at a temperature of 30-32 DEG C, a pH value of 6.8-7.2, and a fermentation time of 24-36 hours.

[0009] Further, the S4 in the process of temporary culture in S3 is added with fermented brine shrimp by probiotics, the probiotics are mixed bacteria of bacillus subtilis and saccharomyces cerevisiae, and the weight ratio of the two is 1:0.5-0.8; the fermentation process is controlled at a temperature of 30-32 DEG C, a pH value of 6.8-7.2, and a fermentation time of 24-36 hours.

[0010] Further, the S4 in the process of temporary culture in S3 is added with fermented brine shrimp by probiotics, the probiotics are mixed bacteria of bacillus subtilis and saccharomyces cerevisiae, and the weight ratio of the two is 1:0.5-0.8; the fermentation process is controlled at a temperature of 30-32 DEG C, a pH value of 6.8-7.2, and a fermentation time of 24-36 hours.

[0011] Further, the S5 in the process of temporary culture in S3 is added with fermented brine shrimp by probiotics, the probiotics are mixed bacteria of bacillus subtilis and saccharomyces cerevisiae, and the weight ratio of the two is 1:0.5-0.8; the fermentation process is controlled at a temperature of 30-32 DEG C, a pH value of 6.8-7.2, and a fermentation time of 24-36 hours.

[0012] Further, the S5 in the process of temporary culture in S3 is added with fermented brine shrimp by probiotics, the probiotics are mixed bacteria of bacillus subtilis and saccharomyces cerevisiae, and the weight ratio of the two is 1:0.5-0.8; the fermentation process is controlled at a temperature of 30-32 DEG C, a pH value of 6.8-7.2, and a fermentation time of 24-36 hours.

[0013] Further, the S5 in the process of temporary culture in S3 is added with fermented brine shrimp by probiotics, the probiotics are mixed bacteria of bacillus subtilis and saccharomyces cerevisiae, and the weight ratio of the two is 1:0.5-0.8; the fermentation process is controlled at a temperature of 30-32 DEG C, a pH value of 6.8-7.2, and a fermentation time of 24-36 hours.

[0014] Compared with the prior art, the method for the cultivation of sea bass has the advantages that: The application focuses on the cultivation of commercial sea bass, and the sea area is pretreated by seaweed ecological protection belt combined with nanometer catalytic electrolysis disinfection, so that the water quality purification is more accurate and the large-scale cultivation environment of commercial sea bass is adapted.

[0015] The application is adapted to natural seawater area, simplifies the breeding process, and reduces the desalination equipment investment and energy consumption by more than 50%; the compound microbial preparation is used in combination with PCR precise disease diagnosis to reduce the disease incidence of perch, and the special environment of saline-alkali water area is not needed, and the application range is wider; the dynamic net and ecological protection belt are used to adapt to the dynamic water flow of the sea area. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The application is adapted to natural seawater area, simplifies the breeding process, and reduces the desalination equipment investment and energy consumption by more than 50%; the compound microbial preparation is used in combination with PCR precise disease diagnosis to reduce the disease incidence of perch, and the special environment of saline-alkali water area is not needed, and the application range is wider; the dynamic net and ecological protection belt are used to adapt to the dynamic water flow of the sea area. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0018] Referring to Figure 1 The application provides a technical solution: a breeding method for perch, comprising the following steps: The selection and pretreatment of the breeding sea area: the sea area with the annual water temperature maintained at 18-25℃, the salinity stabilized at 28-32‰, the dissolved oxygen≥6mg / L, and the pH value in the interval of 7.8-8.6 is selected. The sea area needs to be at least 5 kilometers away from the industrial, agricultural and domestic sewage discharge sources, and the water flow speed needs to be maintained at 0.2-0.5m / s to ensure that the water quality is excellent and stable. 30 days before the perch fry is released, an ecological protection belt with a width of 50 meters is arranged around the selected sea area, and salt-tolerant plants such as mangroves and seaweed are planted to purify the water quality, stabilize the bottom material and create a natural habitat for perch. At the same time, the local water body in the breeding sea area is treated by using the nano-catalytic electrolysis technology, wherein the disinfection equipment adopts a nano-catalytic electrolysis disinfection machine (model NEC-500, electrolytic equivalent 4.5W・h / t); the electrode plate (titanium coating electrode) of the nano-catalytic electrolysis disinfection machine is immersed in water 1.5m underwater, the equipment is turned on and disinfected at an electrolytic equivalent of 4.5W・h / t for 2 hours; after disinfection, sampling detection is performed to ensure that COD=2.8mg / L and total coliform group=85 / L, then compressed air is introduced into the pretreatment area for aeration for 12 hours (aeration intensity 0.5m³ / min・1000m²), sodium thiosulfate is added at 5g / m³, stirred uniformly, and then left to stand for 2 hours, the residual chlorine is detected to be 0.03mg / L, the pretreatment is completed, and then the breeding area is introduced, so as to reduce the number of harmful bacteria in the water body and create a healthy water environment for the growth of perch. This method is different from the traditional way of relying only on natural water body purification or simple drug disinfection.

[0019] Innovative net cage system construction: The net cage frame is made of high-strength and corrosion-resistant HDPE (high-density polyethylene) material, with a wall thickness of 8-10 mm to ensure structural stability in severe sea conditions. The net cage is customized to be 8 meters long, 8 meters wide, and 5 meters high. The main body of the net cage uses knotless polyethylene mesh, and the mesh size is dynamically adjusted according to the growth stage of the seabass: 0.8-1.0 cm for fry stage (body length 3-5 cm), 1.2-1.5 cm for juvenile stage (body length 5-10 cm), and 2.0-2.5 cm for adult stage (body length over 10 cm), accurately adapting to the body size changes of seabass at different stages, while ensuring the safety of seabass and optimizing water exchange efficiency. To enhance wind and wave resistance, the net cage adopts a double-layer structure with a protective net added to the outer layer, with a mesh size of 5-8 cm and a material of high-strength nylon rope. At the same time, six concrete sinkers are evenly arranged at the bottom of the net cage, each weighing 300-400 kg. The top is connected to a floating buoy group by 8 steel cables with a diameter of 15-20 mm. The floating buoy group consists of 10 large high-density polyethylene buoys, each with a buoyancy of ≥500 kg, forming a stable suspended support system. The assembled net cage is hoisted and transported to the pre-treated sea area, fixed to the precast concrete base on the seabed by anchor chains, ensuring that the verticality deviation of the net cage is ≤5°, significantly improving the stability of the net cage in complex sea conditions, and overcoming the disadvantages of traditional single-structure net cages that are easily damaged by wind and waves.

[0020] Selecting and purchasing seabass fry requires that the fry source be healthy, fast-growing, and disease-resistant, and that it has no genetic diseases detected by genetic testing. Select seabass fry that are ≥3.5 cm in length, have high vitality, smooth and undamaged skin, bright color, and uniform size. Two days before transportation, add vitamin C (50-80 mg / L) and astragalus polysaccharides (30-50 mg / L) to the original breeding water to enhance the stress resistance of the fry. Transport using an oxygenated live water vehicle, with water temperature controlled to a difference of ≤2°C from the water temperature in the breeding sea area. Monitor water dissolved oxygen, pH, and other indicators during transportation to ensure that dissolved oxygen is ≥7 mg / L and pH is 7.6-8.4. After the fry arrive at the breeding sea area, float the transport bags on the surface of the breeding water for 30 minutes to balance the water temperature, then gradually add breeding seawater in three stages, with 15-minute intervals between each stage, to allow the fry to adapt to the salinity change. Finally, ensure that the salinity difference between the water where the fry are located and the breeding sea area is ≤1‰, then slowly place the fry into the temporary breeding net cage. The temporary breeding net cage is 3 meters long, 3 meters wide, and 2 meters high, with a mesh size of 0.8 cm. The temporary breeding density is controlled at 500-600 individuals / m³. During the temporary breeding period, feed the fry with artemia nauplii fermented by probiotics, with a feeding amount of 8-10% of the body weight of the fry, 4-5 times a day. Observe the fry closely during the 5-7 day temporary breeding period, and eliminate weak and sick fry to ensure the quality of the fry entering the net cage. This process is different from traditional extensive operations in terms of fry selection criteria, transportation handling, and temporary breeding.

[0021] When the length of the seabass is 3-10 cm, high-quality floating compound feed with protein content ≥48% and fat content 8-10% is fed, the particle size of the feed is 1.0-2.0 mm, the feeding amount is 6-8% of the total weight of the fish, and the feeding is carried out 4-5 times a day; when the length of the seabass is 10-20 cm, the protein content of the feed is adjusted to 45-48%, the fat content is 10-12%, the particle size is 2.0-3.0 mm, the feeding is carried out 3-4 times a day, and the feeding amount is 4-6% of the total weight of the fish; when the length of the seabass is more than 20 cm, the protein content of the feed is 42-45%, the fat content is 12-15%, the particle size is 3.0-4.0 mm, the feeding is carried out 2-3 times a day, and the feeding amount is 2-4% of the total weight of the fish. Each feeding follows the "slow-fast-slow" principle, and it is observed that 80% of the seabass stops feeding after walking to satiety, avoiding feed waste and water pollution. This way of precisely regulating the nutrition of the feed and the feeding amount according to the growth stage of the seabass is different from the traditional single feed and fixed feeding amount mode.

[0022] During the cultivation process, the seabass is graded every 20-30 days using a grading screen, and is bred in different boxes according to the size and physical strength of the seabass. The mesh size of the grading screen is 1.5 cm, 2.5 cm, 3.5 cm, etc., and the seabass is placed in the corresponding net box according to different sizes, and the breeding density is adjusted. When the length of the seabass is 3-5 cm, the breeding density is 300-350 fish / m³; when the length is 5-8 cm, the breeding density is 250-300 fish / m³; when the length is 8-10 cm, the breeding density is 200-250 fish / m³; when the length is 10-15 cm, the breeding density is 150-200 fish / m³; when the length is 15-20 cm, the breeding density is 100-150 fish / m³; and when the length is more than 20 cm, the breeding density is 50-100 fish / m³, so as to ensure that the growth space of the seabass is appropriate and the growth of the seabass is not slowed down due to excessive density and the spread of diseases. This grading and breeding frequency and density control is better than the traditional irregular and inaccurate operation.

[0023] An intelligent net cleaning device is used, which is equipped with a high-pressure water gun and a rotating brush head, and the net is cleaned comprehensively every 15-20 days, with a cleaning pressure of 0.8-1.2 MPa, to ensure that algae, shellfish, protozoa and other organisms attached to the net are removed. At the same time, the net is replaced regularly every 30-40 days, and the new net is disinfected with ultraviolet light for 30 minutes before use, then soaked in a 10-15 mg / L povidone-iodine solution for 1 hour, and dried before use, which effectively prevents the attached materials from affecting water exchange and scratching the fish body. Compared with the traditional irregular manual cleaning and simple replacement method, this method is more efficient and hygienic.

[0024] Each day, early, middle, and late, once patrol pond, observe the bass feeding, swimming state, check the net cage has no damage, frame is stable. Real-time monitoring of water quality monitoring sensor water temperature, salinity, dissolved oxygen, pH, ammonia nitrogen, nitrite and other indicators, data transmission to the aquaculture management platform, when the water temperature exceeds 18-25℃, salinity is not in 28-32‰, dissolved oxygen <6mg / L, pH <7.8 or >8.6, ammonia nitrogen >0.2mg / L, nitrite >0.1mg / L, the platform automatically alarm, timely control measures, such as starting the aerator, adjust the flow, add microbial agents, etc., to protect the stability of the breeding environment, this use of intelligent equipment real-time monitoring and early warning approach ahead of the traditional manual regular detection, lag processing approach.

[0025] High efficient ecological disease prevention and control system: In the surrounding of the breeding sea area, artificial reefs are put in, the material of the reefs is concrete, the specification is 1 meter long, 1 meter wide, 1 meter high, the density of the put is 1 per 100 square meters, small fish, shrimp and shellfish are attracted to inhabit and breed, the natural bait resources of bass are enriched, at the same time, the ecological environment of the sea area is improved, and the immunity of bass is enhanced. Regularly, composite microbial agents such as photosynthetic bacteria, bacillus, lactic acid bacteria, etc. are put into the breeding water, every 12 days, at 9 o'clock in the morning, the composite microbial agents are diluted with the breeding seawater according to 1:10, and are uniformly sprayed along the periphery of the net cage (the amount of the put is 12g / m³), after each spraying, the water pH is detected to be 8.0, so as to ensure the survival of the microorganisms, adjust the bacterial balance of the water, reduce the content of harmful substances such as ammonia nitrogen and nitrite, and inhibit the breeding of harmful bacteria. This ecological prevention and control means starts from improving the overall ecology, which is different from the traditional idea of relying on drug prevention and control.

[0026] Regularly, bass is sampled and detected, common pathogens such as nervous necrosis virus, iridovirus and vibrio parahaemolyticus are detected through PCR technology. Every 25 days, 20 healthy basses with a body length difference of ≤2cm (accounting for 1.5% of the total amount of breeding) are randomly selected, the gill tissue is taken, and the trichodinella and vibrio parahaemolyticus are detected through a PCR detector. Once it is found that the bass is infected with trichodinella disease, 500-600g / 667m² of 60% zinc sulfate powder is sprayed in the whole pond, and 6% albendazole powder is fed at 0.2-0.3g / kg・bw at the same time, once a day, for 5-7 days of continuous feeding. If it is infected with ulcer disease, florfenicol powder is fed at 12-15mg / kg・bw, once a day, for 3-5 days of continuous feeding. During the treatment period, the changes of the disease of bass are closely observed, the drug regimen is adjusted according to the treatment effect, precise drug use is achieved, drug residues and drug resistance are reduced, which is significantly different from the traditional blind drug use and excessive drug use.

[0027] When the body weight of sea bass reaches 1.0-1.5 kg per tail, and the meat is tight, the body color is bright, and the scales are complete, choose to harvest in the morning of small tide water and fine weather. Special sea bass fishing nets are used, with a mesh size of 4-5 cm and soft nylon material to reduce damage to the fish body. When harvesting, first slowly pull up the bottom side of the net box, drive the sea bass to the corner of the net box, and then gently catch it with a small net. Professional live water ships are used for transportation, with a circulating water system, oxygenation equipment, and temperature control device in the cabin. The cabin is thoroughly disinfected before transportation by soaking in 20-30 mg / L chlorine dioxide solution for 2 hours, then rinsed and used. During transportation, the water temperature is controlled at 18-22℃, the salinity at 28-30‰, and the dissolved oxygen at ≥7 mg / L. The transportation density is ≤80 kg / m³ in summer, ≤100 kg / m³ in spring and autumn, and ≤120 kg / m³ in winter. The state of sea bass is checked regularly, and dead fish are removed in time to ensure the transportation survival rate ≥95%. The whole harvesting and transportation process focuses on reducing fish stress and damage, which is different from the traditional extensive operation.

Claims

1. A method for farming of sea bass, characterized in that, The method comprises the following steps: S1, pre-treatment of the breeding sea area: select a non-salt and alkali sea area with a salinity of 28-32‰ and dissolved oxygen of ≥6 mg / L, 30 days before releasing the juvenile, set a 50 m wide mangrove / seagrass ecological protection belt around the sea area, and use nano catalytic electrolysis technology to disinfect the local water body in the breeding area, after aeration for 12 hours and neutralization of sodium thiosulfate to residual chlorine <0.05 mg / L, it is ready for use; S2, net cage setting: use HDPE frame to build an 8m×8m×5m net cage, the main body of the net cage is a knot-free polyethylene mesh, the mesh size is dynamically adjusted according to the body length of the fish, 0.8-1.0 cm for body length of 3-5 cm, 1.2-1.5 cm for body length of 5-10 cm, and 2.0-2.5 cm for body length >10 cm, a 5-8 cm mesh nylon protective net is added to the outer layer of the net cage, and 6 300-400 kg concrete sinkers are arranged at the bottom, and 10 ≥500 kg buoyancy HDPE floats are connected through 8 15-20 mm steel cables at the top; S3, pre-treatment and release of the seedlings: select healthy juvenile with body length ≥3.5 cm, add 50-80 mg / L vitamin C and 30-50 mg / L astragalus polysaccharide to the original water body 2 days before transportation; the temperature difference between the transportation water and the breeding sea area is ≤2℃, the juvenile is mixed with the breeding seawater in 3 times (interval 15 minutes) before entering the cage to make the salinity difference ≤1‰, after temporary breeding for 5-7 days, release the juvenile at 300-350 tails / m³ for body length of 3-5 cm, 250-300 tails / m³ for body length of 5-10 cm, and 150-200 tails / m³ for body length >10 cm; S4, feeding and disease prevention and control: feed the fish with compound feed according to the body length, protein ≥48% for body length of 3-10 cm, protein 45-48% for body length of 10-20 cm, and protein 42-45% for body length >20 cm, feed 2-4 times a day, and the feeding amount is 2-8% of the total weight of the fish; add 10-15 g / m³ of compound microbial preparation to the water every 10-15 days, detect the pathogen of the fish by PCR, add 6% albendazole powder at 0.2-0.3 g / kg·bw for 5-7 consecutive days when trichodiniasis is diagnosed, and add florfenicol powder at 12-15 mg / kg·bw for 3-5 consecutive days when ulcer disease is diagnosed; S5, harvesting and transportation of adult fish: when the body weight of the fish is 1.0-1.5 kg / tail, use a 4-5 cm mesh nylon net to harvest the fish in the small tide period; use a live water ship for transportation.

2. A method for farming of sea bass according to claim 1, characterized in that, After disinfection by the nano catalytic electrolysis technology in S1, the chemical oxygen demand (COD) and the total number of coliform bacteria in the local water body in the breeding area need to be detected to ensure that the COD is ≤3 mg / L and the total number of coliform bacteria is ≤100 / L, and then aeration and residual chlorine neutralization operation are performed.

3. A method for farming of sea bass according to claim 1, characterized in that, In S2, the adjacent bars of the HDPE frame are connected by stainless steel bolts, and the surface of the bolts is sprayed with an epoxy resin anticorrosive coating (thickness 50-80 μm); 10 HDPE floats are evenly distributed in a ring shape along the top frame of the net cage, and the distance between adjacent floats is 2-2.5 m.

4. A method for farming of sea bass according to claim 1, characterized in that, The S3 is fed with the fermented brine shrimp with probiotics in the temporary culture process in S3, the probiotics are the mixed bacteria of Bacillus subtilis and Saccharomyces cerevisiae, the weight ratio of which is 1:0.5-0.8; the fermentation process is controlled at 30-32℃ and pH 6.8-7.2, and the fermentation time is 24-36 hours.

5. A method for farming of sea bass according to claim 1, characterized in that, The S4 is further defined as the fat content of the compound feed fed in stages, the fat content of the feed is 8-10% when the length of the seabass is 3-10cm, 10-12% when the length is 10-20cm, and 12-15% when the length is >20cm, and 0.1-0.2% of taurine is added to the feed.

6. A method for farming of sea bass according to claim 1, characterized in that, The S4 is further defined as the fat content of the compound feed fed in stages, the fat content of the feed is 8-10% when the length of the seabass is 3-10cm, 10-12% when the length is 10-20cm, and 12-15% when the length is >20cm, and 0.1-0.2% of taurine is added to the feed.

7. A method for farming of sea bass according to claim 1, characterized in that, The S4 is further defined as the fat content of the compound feed fed in stages, the fat content of the feed is 8-10% when the length of the seabass is 3-10cm, 10-12% when the length is 10-20cm, and 12-15% when the length is >20cm, and 0.1-0.2% of taurine is added to the feed.

8. A method for farming of sea bass according to claim 1, characterized in that, The S4 is further defined as the fat content of the compound feed fed in stages, the fat content of the feed is 8-10% when the length of the seabass is 3-10cm, 10-12% when the length is 10-20cm, and 12-15% when the length is >20cm, and 0.1-0.2% of taurine is added to the feed.

9. A method for farming of sea bass according to claim 1, characterized in that, The S5 is further defined as the small tide water period for harvesting the adult seabass, which is 1-2 hours before the tide rises and 1-2 hours after the tide falls, and the moving speed of the net is controlled to be ≤0.5m / s during the net operation.

10. A method for farming of sea bass according to claim 1, characterized in that, The S5 is further defined as the oxygenation method for the live water transportation, which is the nano aeration disc oxygenation, the aeration disc arrangement density is 1 / m³ of the ship cabin volume, and the oxygen supply amount is controlled to be 2-3L / min·m³; the ammonia nitrogen content of the water body is detected every 2 hours during the transportation process to ensure that the ammonia nitrogen is ≤0.2mg / L. The S5 is further defined as the water temperature, salinity and dissolved oxygen during the transportation process, which are 18-22℃, 28-30‰ and ≥7mg / L respectively, the transportation density is ≤80kg / m³ in summer, ≤100kg / m³ in spring and autumn, and ≤120kg / m³ in winter.

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