Culture methods of silver carp scientific combination culture to increase production and income

fish culture

Silver carp is widely distributed in eastern Asia and can be seen everywhere in major river systems in China. This fish grows fast, from 2 to 3 years old, weight can be increased from 1 kg to 4 kg, the largest individual can reach 40 kg. Natural yields are high. At the same time, silver carp food for phytoplankton, thus becoming the first-class fish for raising fish, has always been included in China's freshwater culture "four big fish" one.

1. Scientific cleaning of fish ponds

Silver carp belongs to the set of fish, generally set in the herring, grass carp, bighead carp pond. Fish ponds should be easy to irrigate and drain. Silver carp and bighead carp should have 20 cm deep silt at the bottom of the pond. Green carp and grass carp should have little or no silt at the bottom of the pond. It covers an area of 1-5 mu and has a water depth of about 1.5 meters. The pond should be cleaned before stocking.

2. Reasonable combination and stocking

In the pond mainly for silver carp, 3-4 bighead carp and grass carp are cultivated per mu; in the pond mainly for bighead carp, 6-8 grass carp are cultivated per mu; in the pond mainly for herring, 2-3 silver carp and grass carp are cultivated per mu; in the pond mainly for grass carp, 3-5 silver carp or bighead carp are cultivated per mu. The ratio of male to female of silver carp, bighead carp, green carp and grass fish is generally 1:1-1.5. At the same time, 8-10 mandarin fish and about 150 tail silver carp were stocked per mu to control the breeding of wild miscellaneous fish and large zooplankton.

3. intensive feeding management

Before stocking, 500-700 kg decomposed organic fertilizer should be put into each mu of silver carp and bighead carp breeding pond to cultivate plankton, and appropriate fertilizer should be applied later. In addition, sunny and warm weather to feed bean cake slurry to promote gonad development. Herring species fish to feed snails, clams based, supplemented by bean cakes and other concentrate. Grass fish to grass, ryegrass, potato vine and other green material-based, supplemented by concentrate, if spring and autumn grass shortage, you need to concentrate based. In order to keep the water fresh, water should be injected frequently in autumn, and in winter, the water depth should be kept above 1.5 meters.

4. Integrated control of fish diseases

Fish disease prevention is the main problem in breeding fish. 0.4ppm crystal trichlorfon is used to spray the whole pool in spring and autumn every year to prevent parasites, and 30ppm quicklime or 1ppm bleaching powder is used to spray the whole pool once a month from April to October to prevent bacterial diseases. Once fish disease is found, actively prescribe the right medicine and cure it as soon as possible.