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鱼类土栖藻中毒及防治 1.中毒症状。小土栖藻在水中能分泌一种毒性物质,可使鱼类和水生生物大量中毒死亡。鱼苗死亡时常常体表无明显症状;而鱼种和成鱼患病后则多呈鳍基部和鳞片基部充血,鳃盖发红,群集于水边或向岸边乱窜,口张向水面,病情严重的则反应迟钝,用手即可轻易捞取。2.危害病因。该病暴发时,从池塘采一滴水样,可直接在显微镜下看到大量的藻体。小土栖藻对水体中铵氮的含量最敏感
Fish soil caustic poisoning and prevention 1. Poisoning symptoms. Small soil algae in the water can secrete a toxic substance, can make a large number of fish and aquatic organisms poisoning death. When the fry dies, there is usually no obvious symptoms on the surface of the body. When the fish species and adult fish are sick, the fins and the base of the scales are mostly hyperemic. The gill covers are red. Clustering at the water edge or spreading to the shore, Serious reaction is unresponsive, easy to retrieve by hand. 2. Harm the cause. At the time of the outbreak, a drop of water was taken from the pond and a large number of algae could be seen directly under a microscope. Small soil algae is the most sensitive to ammonium nitrogen in water