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江西省信丰县水北小学教师李风英,家住水北路30号。她自家院内有个小水坑,全家的生活用水,以及猪、鸭、鸡等粪便随水一起流入坑内,排不出去,使水变臭。如要将水坑填平,钱至少得花500元,经全家合计,将这口12平方米,水深1米多的水坑养鱼。前年放养了120尾红罗非鱼苗,经七个月的饲养,当年获鱼36公斤,平均每尾重0.3公斤,成活率达100%。为了使水坑里的浮游生物大量繁殖,她在水坑的两头各打了一口手摇井,每天抽水数次加
Xinfeng County, Jiangxi Province, Shui North Primary School teacher Li Fengying, who lives on the 30th North Road. Her own hospital has a small puddle, the family’s domestic water, and pigs, ducks, chickens and other manure into the pit along with the water, can not be discharged, the water smelly. If you want to fill the puddle, the money has to spend at least 500 yuan, the family total, this will be 12 square meters, more than 1 meter deep pudding fish. The year before the stocking of 120 red tilapia seedlings, after seven months of breeding, when the fish was 36 kg, an average of 0.3 kg per tail, the survival rate of 100%. In order to multiply the plankton in the puddle, she struck a hand-cranked well at each end of the puddle, pumping several times a day