Rapid breeding techniques of Fish fingerling in Summer

Summer is a very important season for fish breeding. Good cultivation measures can promote growth, enhance physique, improve disease resistance, provide excellent species with large size and strong physique for adult fish culture, and increase production, income and efficiency. Summing up the experience in recent years, the following points should be achieved in the rapid cultivation of fish species in summer:

First, adjust the water environment. As the saying goes, "if you raise water first, the fish fry will be strong." In the ponds where fish species were cultivated in the past, due to long-term culture and silt accumulation, water quality gradually aged and deteriorated, dissolved oxygen decreased, food organisms decreased, pathogen maintenance organisms and harmful substances increased, which was disadvantageous to the growth and development of fish species. Therefore, it is necessary to do everything possible to improve the water environment in which fish species grow. First, often change the new water, discharge the old water, add 30cm fresh water every time, discharge 20~30cm old water, keep the water body relatively stable. The second is to properly fertilize the water quality, generally apply 200 kg of fermented manure every 7 days, or add fresh water once per mu, so that the water body is nutritious, plankton is stable and the transparency is about 30cm. Third, regular water quality disinfection, sprinkled with quicklime 15kg/6677m2 or 1g/m3 bleaching water every half a month, quicklime adjusts pH, releases nutrients, and improves water quality; while bleaching powder kills bacteria and viruses and is used alternately, achieving remarkable results in preventing and treating fish diseases.

Second, adjust the specifications of fish species. Different specifications of fish should be raised in different ponds, and different varieties should be matched reasonably. The general practice is: if the water depth is more than 1.5m, about 5000 fish can be raised per 667m2, and if it is tilapia, common carp and crucian carp, 6000 fish can be put per 667m2.

Third, strengthen the control of water quality. The weather is changeable in summer and the water temperature is high. In order to prevent the pond water temperature from being too high, deep water should be irrigated. Secondly, it is necessary to add new water and discharge old water, generally changing water once every 7 days, and pay attention to keeping the water quality fresh. In short, we should be flexible according to the situation of the pool water. Keep fat, alive, tender and cool.

Fourth, pay attention to reasonable nutrition. In summer, we should pay attention to supplement fresh feed to grass carp and blunt snout bream, such as turf, duckweed, green grass, green vegetable leaves, etc.; herring should add crushed snail, clam, etc.; silver carp and bighead carp should also be fed with crushed wheat husk, corn bran, soybean meal and so on. And add appropriate amount of green feed. Feeding should be timed, fixed-point, qualitative and quantitative, which not only does not waste, but also makes the fish eat full and fat, so as to ensure that the fish species reach larger specifications. The daily feed intake should account for 3% of the fish stock in the pond. Dace, roe, Pomfret and catfish of four major domestic fish species, tropical and subtropical fish were fed at 9: 10 am and 15: 16 pm. Do not stop eating prematurely before reaching a certain specification, so as not to affect growth.