Fish culture technology and methods

1. Clean the pond thoroughly and disinfect it, and apply base fertilizer at one time. When fish enter tang qian, it is necessary to dredge the water injection and drainage channels and remove excessive silt in the pond. When the water depth is 20 cm, each mu of fish pond is disinfected with 100 kg of quicklime to kill pests, germs and microorganisms, and then 500 kg of decomposed human and animal manure is applied as base fertilizer. Then the water storage depth is 2 ~ 2.5 meters, and after 1 week, the fish will be released after the medicinal properties disappear.

2. Increase stocking specifications and put "two kinds of fish". The survival rate of large fish species is high, and the commodity specifications of the pond can be guaranteed. Therefore, the best stocking specifications are grass carp 200-400g, silver carp and bighead carp 100-300g and carp 50- 150g.

3, reasonable collocation polyculture, three-dimensional fish culture. In order to make full use of water space and natural bait, it is necessary to cultivate "fat fish" such as silver carp, bighead carp and tilapia, and "fish-eating fish" such as grass, carp and bream. There are 200 ~ 1 500 fish per mu, of which grass carp accounts for 40%, silver carp for 40%, carp, crucian carp, bream and tilapia for 20%, and the total stocking amount per mu is about 1.50 kg.

4, feeding mixed feed, adhere to the thin tube intensive cultivation. According to the physiological and daily needs of fish, compound feed is made from wheat bran, rice bran, bean cake powder, distiller's grains, minerals, vitamins and fish medicine to improve feeding efficiency. Feed per mu per year 1500 kg. At the same time, grass carp are raised by planting ryegrass, Sudan grass, salvaging duckweed and duckweed, and fed 2-3 times a day. 5. Skillfully apply topdressing in time to cultivate natural bait. When the temperature is low, it is advisable to fertilize water suddenly and cultivate plankton suitable for "fat fish" to promote the rapid growth of silver carp and bighead carp. Top dressing once every 2 ~ 3 days, and applying decomposed human and animal manure100 ~150kg per mu. When the temperature rises in summer, farmyard manure is easy to flood the pond, so chemical fertilizer can be applied instead, once every 5 ~ 7 days, and 2.5 ~ 5 kg of chemical fertilizer is applied per mu each time.

6. Set up fish species with specifications, catch big fish and raise small fish in stages. Scientifically design the quantity and quantity of stocking, intercropping and fish, implement the rotation of catching and releasing, catch big fish three times a year, keep small fish, and catch 500 ~ 600 kilograms, so as to achieve a balanced listing, and the rest of the fish will come out of the pond together after autumn. At the end of July, 6 ~ 10 cm small fish species were interplanted to prepare for the cultivation of large fish species in the next year.

7, take turns to spill drugs, timely prevention and treatment of fish diseases. In the high temperature period, 250-350g of quicklime10kg or 90% crystal trichlorfon is mixed every half month. At the same time, bleaching powder or baskets of copper sulfate and ferrous sulfate are hung on the floating bait platform of fish to disinfect the food field. In the epidemic season of grass carp enteritis, feed 0.5 kg garlic mixed bait per 100 kg grass carp for 3 ~ 6 days to prevent grass carp enteritis.