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一、渔业环境的污染概况 1986年统计全省有工业污染源单位25956个。每年排放工业废水总量为20.3亿吨,经处理的为53127万吨,仅占总废水量的26.2％。废水中主要含Hg、As、Cd、挥发性酚、悬浮物等有毒物质。据统计每年排入江河的废水中,含石油类2230.5吨,COD568641.68吨,挥发性酚483.71吨。其中排入洞庭湖的废水中毒物种类以BOD_5、COD、挥发性酚、硫化物、石油类较高,还加上血防灭螺使用的五氯酚钠等。这些废水对鱼类资源破
First, the pollution of the fishery environment Survey in 1986 the province’s industrial pollution sources 25,956 units. The total amount of industrial wastewater discharged each year is 2.03 billion tons, 53127 tons of which are treated, accounting for only 26.2% of the total amount of waste water. Waste water mainly contains Hg, As, Cd, volatile phenol, suspended solids and other toxic substances. According to statistics, the wastewater discharged into the rivers annually contains 2,230.5 tons of petroleum, 568,641.68 tons of COD and 483.71 tons of volatile phenol. Which discharged into the Dongting Lake poisoning species BOD_5, COD, volatile phenol, sulfide, petroleum higher, but also with the blood of snail control of pentachlorophenol and so on. These waste water resources on the broken