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Nurturing broodstock
Spring is a crucial period for gonad development in broodstock. Experts remind farmers to pay attention to the following technical measures in production management: First, timely increase water temperature: when it is fine, drain water to lower the water level of the fish pond and speed up the water temperature of the fish pond; When rainy or cold air comes, it is necessary to fill the pool water in advance to slow down the cooling of the pool water. The second is to scientifically feed the feed: the spring is the development phase of fish gonadal, fish food intake will increase. In the case of blue brood fish ponds, it is necessary to cast enough live feed containing high levels of animal protein such as snails, scorpions, and quail meat. The daily feed amount can be 3% to 5% of the weight of the fish, and it is necessary to assist in feeding pellets. Feed etc. Grass broodstock ponds should be fed with fresh green fodder, and the daily feeding amount should be 40-60 kilograms per mu, and auxiliary feeding of barley malt, bean cakes, etc. with high protein content. For crickets and puffer fish ponds, it is necessary to intensify the fertilization, apply once every 2 to 3 days, and apply manure 50 to 60 kilograms at a time, and assist in the application of bean paste. When the water temperature rises above 20 degrees Celsius, it is necessary to gradually reduce the amount of supplementary materials until full concentrates are cast in order to prevent excessive accumulation of fat in the broodstock and delay gonad maturation and cause dystocia. The third is to manage water quality: The water quality should be kept fat, live, tender and cool. The transparency of the broodstock pond should be kept at 35 cm or more. And pay attention to regular water injection, water injection 2 to 3 times a month, the depth of each water injection is 0.2 to 0.3 meters. The transparency of the pufferfish and broodstock ponds should be maintained at 0.3 meters and injected 3 to 4 times per month. The depth of each injection of water should be 0.1 to 0.2 meters. Starting in late April, prenatal water stimulation is required. The requirement is to run water once a day for 2 to 4 hours. Fourth, we must pay attention to prevention and treatment of fish diseases: broodstock diseases are mainly print diseases, red skin disease and anchor head rickets. The method of prevention and control is: Quanchiposa 0.2-0.4ppm of dibromohydantoin or 2-4ppm of gallnut and other alternate use. In addition, for head lice disease, it can be killed by 0.2-0.5 ppm of 90% crystal trichlorfon Quanchiposa.