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今年江苏、安徽、湖北等省连降暴雨,造成百年不遇的洪水。这次洪水不仅破坏圩埂、围网,使鱼、蟹逃跑,还造成鱼、蟹大批死亡。笔者所在单位江苏省金湖县宝应湖农场养殖区有的养殖户每天死蟹近500—600只,且规格大多在60—100g/只;鱼死亡近20—30kg。河蟹死亡时,有的鳃发黑,有的步足及外壳有数目不定的黑褐色斑点,有的肠道发炎且无粪便,有的直接从水底浮上来,而无任何症状。鱼则表现为暴发性出血病。造成这种现象原因分析有以下几点:
This year, Jiangsu, Anhui, Hubei and other provinces heavy rains, resulting in a rare case of floods. The flood not only destroyed the fairways, fences, fish, crabs escape, but also caused a large number of fish and crabs died. The author’s unit, Jinhu County, Jiangsu Province, Baoying Lake farm farms some farmers nearly 500-600 dead crabs per day, and specifications mostly in 60-100g / only; fish died nearly 20-30kg. When the crab died, some gills were black, and some had foot-steps and a number of dark brown spots on the outer shell. Some of the intestines were inflamed with no droppings and some floated directly from the bottom without any symptoms. Fish is manifested as fulminant hemorrhagic disease. Analysis of the causes of this phenomenon have the following points: