Seine fish farming as a large-scale new breeding method can achieve considerable economic benefits. The key technologies are summarized below. (1) Water: The maximum flow rate is between 0 and 3 m/s. Water depth between 1.5 and 3 meters, water level difference within 1 meter, away from the channel and pollution sources. (2) Wai: Double-layered, double-rowed, subgrade is fixed with stone bolts and anchored by ground. Two-layer mesh sheets are set to prevent escape from observation; cages in high-yield areas are double-sided cages; net height is the maximum depth 2 times, fish nets used 2# to 4# polyethylene nets (Heads 1.11 to 1.33 cm), and fish nets used 7# to 8# nets (Ningda 1.?90 to 2? .22 cm). (3) Species: Choose suitable fish species, grass carp 200g to 250g/tail, herring 500g to 1000g/tail, head 50g to 200g/tail, carp 25g to 75g/tail, carp 20 grams to 100 grams/tail, bream and silver carp 150 grams to 500 grams/tail. (4) Poria: mainly fresh aquatic plants and snails, supplemented by concentrated materials. Using the "two-headed, middle-green" method, a small number of feeding, and take the timing, positioning, quality, fixed-point feeding. (5) Mixing: Multi-species and multi-species with reasonable specifications, appropriate closeness, three-dimensional use of water layer, multi-level use of natural food bait in the food chain. (6) Round: Take “one-off footing, round-by-step rotation, and batch start-up assistance†to give full play to the advantage of Dashui Noodle Aquarium, that is, before May, first put small fingerlings into the breeding area separated by mesh. Before the end of July, it was expanded to 60% of the aquaculture water surface and it was fully released at the end of September. This kind of step-by-step liberalization method can breed or artificially transplant some high-quality aquatic plants during the leisure period when the fish species are not put into it, so as to increase the biological productivity and utilization of aquatic plants. (7) Prevention: Anti-escape is the core of the breeding of the purse seine. There are three stages of fish escape prevention during a growth cycle: 1) After 7 to 10 days of stocking, the fish often spends days and nights clustering along the network. "Run the net" and "bite the foil", in the event of a network break or poor mesh connection, that is, a large number of escape. During the flood season or storm, the water level rose sharply and the fish rushed to the top, tentatively jumping wildly. When the three fish were caught, the schools of fish were frightened. In disease prevention, we must strictly abide by the "disinfection of fish before stocking, and prevention before the onset of grass and bluegrass" in order to effectively control fish diseases. (8) Tube: Brush the walls of the wall from time to time to check for any holes in the screen. At the same time, the combination of fish and fries can be used to comprehensively utilize the water layer to improve the overall utilization of the water body.
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