Second, do a good job in the release of fry and fingerlings. According to the local food and water conditions, determine the main breeding species. If there is rich grass, it is advisable to raise grass and squid. If the source of fertilizer is sufficient, it can be used to raise maggots, earthworms, white quail and tilapia. In regions where there are many snails and clams, green and squid can be cultivated. The amount of stocking depends on the conditions of the pond and the level of feeding and management. The intensive fishponds are generally put in 1,500 to 2,000 fish per acre, and the rough fish ponds are stocked in 500 to 1000 fish per acre. To increase the yield per unit area, multiple varieties and specifications should be implemented. The rational mixed culture density of fish species, the fish species should be disinfected before stocking.
Third, do a good job of broodstock cultivation. Spring is the key stage of gonad development in broodstock. Early brooding is very important. First of all, we must do a good job of water quality management. The brooding pond should be filled with water in a timely manner. After March, pupa and carp ponds should be filled once every 10 days to 15 days; green and grass ponds should be filled once every 2 days to 3 days. Secondly, it is necessary to grasp the feeding of bait, and feed a certain amount of malt, soybean cake, etc. in the early stage to promote gonad development of the broodstock. In the middle and later stages, the grass carp should be fed with ryegrass and terrestrial grass; Feeding cakes, bran rice. At the same time, some human and animal feces should be properly applied, and herring should be fed with fresh snails and oysters.
Fourth, pay attention to fertilizer feeding. Fish species should be applied before the stocking basal fertilizer, 1 mu manure 250 kg to 300 kg; when topdressing, the amount of early spring less time, late spring should be less than the amount of time; to maintain the water was brown, reddish brown, transparency in about 30 cm.
Fifth, do a good job of prevention and treatment of fish diseases. The common fish diseases in spring are watery mildew, gill rot disease, and small melon worm disease. Fish disease should be based on early prevention. Every 1 month or so, 1mg/L bleaching powder and 0.2-0.4mg/L crystal trichlorfon should be splashed into the pond. Found fish diseases, timely diagnosis, symptomatic treatment.
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