From 2002 to 2003, Yueqing Rongsheng Aquaculture Farm built 160 cages in Yueqing Bay, Zhejiang Province for the cultivation of large yellow croaker, American redfish, and black seabream. Through the transformation of traditional cages, rational distribution, and careful management, the company produced 42 tons of commercial fish and 47 tons of fish respectively, and achieved good economic benefits. The relevant technology is introduced as follows. First, cage manufacturing technology (a) materials 1. Frame selection of imported door Griss board as the main structural material. The sheet thickness is not less than 80 mm and the effective diameter of the steel tube is not less than 50 mm. 2. The size of the float bucket is 500 mm in diameter and 800 mm in diameter. The mooring line is a 45 mm diameter polyethylene string, with a standard breaking load of 20,000 kg and a standard weight of 210 kg for a length of 200 meters. 3. Anchor HHQ-1300 large grip anchor or other anchor. 4. The thickness of the steel fittings is 15 mm, the bolt diameter is 16 mm, and the earring diameter is 45 mm. They are all No. 3 steel. 5. The net clothing for the net is polyethylene net. (b) cage structure 1. cage shape cage shape using square. The cage size is 4 meters (4 meters) by 4 meters (4 to 6 meters) and consists of an outer box and an inner box. The outer box is made of 30 strands of polyethylene mesh sheet with a mesh of 3.8 cm. The inner box was made of polyethylene mesh sheets with mesh openings of 0.5 cm, 1 cm, 1.5 cm and 2.5 cm, respectively. 2. Boxes The cages of the cages are draped in four corners of a box with a weight of 30-60 kg. The inner box is supported by a 5kg sandbag, which is a structure that better prevents the impact of rapids and debris. (III) Breeding platform 1. Frame structure The frame structure is built with imported Mengeri frame group. The structure is 90 to 120 meters in length and 16 to 30 meters in length. The entire structure is divided into 3 to 4 sub-structures along the length direction, and the sub-structures are connected flexibly to break down the force of wind and waves on the structure. The grid pattern is 4 meters 4 meters in size, with two float buckets on each side. 2. The mooring line is arranged along the entire periphery of the structure (culture platform). When the layout requirements are to meet the highest tide level, the mooring line of the culture platform is under tension. When the mooring line meets the wind force 10, the wave height of 2 meters is safe. 3. The connection arrangement of node connection nodes adopts overlapping orthogonal connection and node overlapping and oblique connection. 4. Platform shape In order to reduce the impact of fluctuations on cages, the culture platform is designed as a ship, with double-layered flow-blocking meshes hanging at both ends and on both sides. The establishment of the aquaculture platform is parallel to the tidal fluctuations, which not only helps the flow of water in the cage, increases dissolved oxygen, but also maintains appropriate water flow stimuli, improves the quality of cultured products, and facilitates the elimination of metabolites and wastes. And it will help improve the ability of the breeding platform to withstand wind, waves and tides. Second, aquaculture technology (a) the purchase and stocking of fry 1. Fry purchase in late March to early April, from Fujian Ningde, Zhejiang Yuhuan fish fingerlings and other places to buy seedlings. Select fish fry with similar specifications, well-shaped, healthy and disease-free wounds as seedlings. The specifications for fry for large yellow croaker and American redfish are 5 to 8 cm in length, and 3 to 5 cm for black sea bream and sea bream. 2. The fry release fry is transported by live water transport. Before the stocking, a brief seawater transition treatment and immersion disinfection were performed and then placed in a cage for rearing. Stocking density is generally controlled at 5,000 to 10,000 tails per cage. The cages for breeding large yellow croaker can be mixed with fish such as black sea bream and true sea bream so as to improve the ecological breeding effect. 3. Dividing from fry stocking to sale of finished fish is generally carried out by four divisions and rearing once in two months. Replace cages at the time of division. At the beginning of stocking, the inner box has an aperture of 0.5 cm. With the growth of the fish, the inner box is replaced with a box with a mesh size of 1 cm, 1.5 cm, and 2.5 cm, and the amount of electricity per cage-farming fish is reduced. When the finished fish is sold, the number of fish per cage is 800 to 1,000. (II) Feed and Feeding 1. The feed for feed cultivation mainly includes small octopus, blueliner, and ginseng fish. All bait fish need to be pulverized by a meat grinder to feed palatable fish pieces. If it is a frozen fish, it needs to be processed in seawater after soaking and thawing. Sometimes semi-moist feed is used to increase feed utilization. No matter what kind of feed, be sure to keep it fresh. 2. Feeding (1) Feeding times and times: Feeding and feeding are conducted twice during the growing period. Normally, every day is selected in the morning and it is fed one time before dark. Even though the electricity can be flexibly arranged according to weather conditions and tides. (2) Feeding amount: The daily feeding amount is generally controlled at 4% to 7% of the fish's body weight, and it is appropriate for the fish to stop eating. At the same time, it will increase or decrease according to the weather, water temperature and storm conditions. (3) Feeding method: The feed must be injected in the middle first, and then be fed several times to spread around to ensure that the fish has enough feeding space and feeding time. At the same time, the fragile fish can also eat feed and promote the even growth of fish. Before feeds are fed and during feeding, minimize the movement of people and external harassment so as not to affect the feeding of fish. (III) Disease Prevention and Control 1. Disinfection As a result of the shallow waves in the shallow sea, the cultured fishes are susceptible to bruising and infecting bacteria, and are prone to inflammations such as rotting and rotting. Disinfect with lime or potassium permanganate once a month. When disinfecting with quicklime, the method of direct sprinkling is generally adopted. The quicklime is placed in a 80-mesh sieve bag to be washed into a high-concentration solution. When disinfecting, the four corners of the cage are pulled up, the net of the cultured fish is laid on the surface of the water body, and the quick-lime solution is used to sprinkling Depending on the dilution of the drug concentration in the water body, additional sprinkling and disinfectant should be maintained at a certain concentration for 5 minutes. Potassium permanganate disinfection method is the same as quicklime. Normally, potassium permanganate is used to disinfect 3 to 4 times and then disinfected with lime once at intervals. 2. Drug prevention In the May-August month of disease-prone season, the use of jasmine, gall, flavescens and other fried concoction bait feeding, twice a month, each for three consecutive days. With vitamin C bait feeding, enhance fish disease resistance. 3. Prevention and control During the peak period of disease, feed with baicale, allicin, fish and other mixed baits, each for five consecutive days, at the same time improve cage cleanliness, improve the speed of flow within the cage, according to changes in the environment and the weather Feeding management and other measures to reduce the incidence of disease. (IV) Daily management 1. Daily, early, mid-night and evening inspections of the culture cages should be done once to check for broken nets, broken ropes or loose ropes. Check whether the water color and fish movements are normal and remove debris in a timely manner. 2. Change the cages every two months or so, try to combine the caged fish with the net, keep the same specifications of the farmed fish and clean the cages. 3. Measure the water temperature and salinity every day and make records; record the weather conditions, feeding type and quantity, fish feeding and activities and other related matters, and establish a culture log. 4. In the initial stage of fry stocking and the exchange season, additional baffle facilities shall be provided to increase the survival rate of the fry. 3 meters away from the front direction of the breeding platform, with a 10 mesh net vertical sagging from the water surface 3 to 4 meters deep cable, fixed with a rope, anchor, play blocking role. 5. In the typhoon season, reinforcement cages and other anti-Taiwan measures shall be taken to ensure good anti-Taiwan work.
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