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1991年4月和9月初,在我单位的池塘,曾发生几起死鱼现象;4月初,一口12亩的成鱼塘,每天死鱼种50至100尾、九月初又是这口塘出现多次死鱼,每天死鲢鱼20至30尾,偶尔死个别鳊鱼、鲤鱼、鲫鱼。死鱼表面特征:其主要表现为肛门发炎充血,鱼鳍基部充血,鲤、鲫鱼的胸部亦出现充血,用手抹鱼体具有粗糙感。将死鱼提起,肛门有腐物流出。内脏具膘冲气,无它特征。我们对现场及食料、施肥等一系列原因进行分析,均未查出结果,但在此季节每天早晨七至十点左右水面会出现一层黄褐色的物质,随后就陆续
In April and early September 1991, several dead fish occurred in the ponds of my unit. In early April, a 12-acre fishpond took 50 to 100 dead fish every day. In early September, this pond again appeared Many dead fish, silver carp daily 20 to 30, and occasionally died individual bonito, carp, carp. Dead fish surface features: The main performance of the anorectal hyperemia, fin base congestion, carp, crucian carp also appear congestion in the chest, hand-wiping fish body with a rough sense. The dead fish filed, the anal outflow of decayed things. Internal organs with 膘 gas, no features. We analyzed on-site and food, fertilization and a series of reasons, but did not find the results, but in this season every day from about seven to ten o’clock there will be a layer of brown water on the surface, and then on in succession