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Spring fish culture technology
In spring fish farming, we must first do a good job of material preparation, such as artificial propagation equipment, commonly used drugs, fish farming machinery and tools, and fertilizers and baits. Fish farms and fish farming households that cannot fish from fry, but also should choose a breeding unit for fry to facilitate the purchase of high-quality fry. Grasp the release of fry and fingerlings. According to the local food and water conditions, determine the main breeding species. Water and grass rich fish ponds are mainly for raising grasses and squid; fish ponds with adequate fat source can raise oysters, earthworms, white plover and tilapia; areas with more snails and fleas can be used to raise young fish and squid. . The amount of stocking depends on the condition of fish ponds and the level of rearing and management. Intensive culture of fish ponds is generally put on 1,500-2,000 tails per acre, and crude fish ponds are stocked on 500-1,000 tails per acre. In order to increase the yield per unit area, rational multi-culture and dense-culture of multi-species and multi-species fish species should be implemented. Grab broodstock cultivation. Spring is the key stage of gonad development in broodstock, and it is very important to breed broodstock in time. First of all, we must do a good job of water quality management, and brooding fish ponds should be flushed in a timely manner. After March, the squid and carp fish ponds were flushed once every 10-15 days; the grass and grass carp ponds were flushed once every 2-3 days. Secondly, it is necessary to do a good job of bait feeding, early feeding of a certain amount of cereal malt, soybean cake and other feed; in the middle and later stages of grass carp to feed ryegrass, quail and carp to feed cakes, bran-based, herring to Feed fresh snails and oysters. At the same time, appropriate human and animal dung. Pay attention to fertilizer feeding. Fish species should be applied with base fertilizer before stocking, with 250-300 kg of manure per acre. When applying topdressing, early spring should be less in quantity and more in late spring. Keep the water color brown green, reddish-brown, with a transparency of about 30 cm. Do a good job of prevention and treatment of fish diseases. Fish disease should be dominated by early defense. Sprinkle 1ppm of bleaching powder and 0.2-0.4ppm of crystal trichlorfon once every 30 days. Found fish disease, it is timely diagnosis, symptomatic treatment.