Grass carp belongs to carp form to look grass carp of subfamily of elegant Luo Yu belongs to carp division, grass carp serves as breed the breed aquatics with the biggest crop fish, be our country common people " n/COL the head of a family fish " , yinjisheng is long rapid, feed origin is wide, it is one of 4 everybody fish that Chinese fresh water breeds. The progenitive method of grass carp, because grass carp cannot lay eggs in dead water, because this lays eggs,the place chooses the river in river river trunk stream commonly the river with the deep chamfer water area of a side of confluent place, meander, abrupt and constrictive two sides paragraph to lay eggs aptly place. Breed period: The breed of grass carp period with silver carp close, relatively black carp and Yong earlier a few, reproductive period was controlled in July to arrived in April, center between May mostly. Lay eggs means: Grass carp is normally undertake laying eggs in water layer, piscine body not float shows water, be used to says " produce frowzily " , but when encountering good reproductive zoology condition, if water level is steep,go up and companion has thunderstorm, at this moment female, male fish is in the superstratum angle of water, appear those who admire an abdomen to tremble " float is discharged " phenomenon. After egg be fertilized, because egg film is bibulous,expand, egg diameter can amount to 5 millimeter to fluctuate, downstream is seaborne, growth is controlled in 20 ℃ optimal, about fry of 30-40 hour hatch. Grass carp breed aquatics manages pond disinfection: Pond area with 10 ～ 20 mus advisable, depth of water 2 ～ 2.5 meters, silty ply does not exceed 20 centimeters. The aerator for 3 kilowatt mixes power of form a complete set of every 10 mus of ponds to deliver bait aircraft automatically each 1; Winter discharges dry Chi Shui, aspic basks in 20 days of above. Put in a suitable place to breed time: Spring Festival around, every mus put norms to be 250 grams of 200 ～ / the careless fingerling of end 300 end, norms is 20 end of 15 ～ / kilogram crucian carp fingerling 300 end, norms is 6 end of 5 ～ / kilogram 50 end, variegated carp plants silver crap fingerling 10 end, before fingerling puts in a suitable place to breed, with 5% salt leach bubble disinfects 5 ～ 10 minutes. Water quality management: Use aerator correctly, 6 ～ October sunshine calm weather, midday of every the world 1 ～ 3 when switch on the mobile phone add oxygen 2 hours, before dawn is timely add oxygen; Consecutive cloudy day should in advance adds oxygen. Pond of timely Xiang Chi is added pour new water, adopt " small platoon is small into, change water for many times " method is progressively adjusting control water quality. Raise feeds: Feed grain feed in order to cast to give priority to, feed protein content is in 28 ～ 32% , complementary cast viridescence feed. Feed is cast hello abide by " before thick hind essence of life " and " 4 calm 4 look " principle, cast everyday commonly feed 2 times, be over with eating inside 2 hours, grass carp is photographed feed 8 into full advisable. Cast continuously feed grain feed after period of time, should stop feed grain feed 1 week, cast inside interval period feed feed of unprocessed food grains. Grass carp is common enteritis is disease of ill skin having red, sodden branchial disease, ill, adopt the remedial method that photograph union spills outside to be taken orally commonly, spill outside main with bleaching powder, 2 oxidation chloric wait for disinfectant to give priority to, use consecutively 3 days; To be taken orally with " 3 yellow pink " medical bait effect is better, weight of every 50 kilograms of fish uses 3 yellow noodles or vermicelli made from bean or sweet potato starch (Chinese rhubarb 50% , Huang Bai 30% , Huang Qin 20% , divide evenly of the agitate after grinding flour) after with flour 0.3 kilograms paste is mixed even, mix cast into feed hello, use consecutively 3 ～ 5 days. Catch: Catch since adult fish of timely will big norms appearing on the market is the important step that grass carp high yield breeds, main purpose is the amount holding a fish that reduces pond water put oneself in another's position, fish of pool of stimulative later period grows quickly. Catch 1 times at rising by July commonly, in early morning water lukewarm inferior when case catch.