洋澜湖下湖鱼类中毒死亡原因分析

面积１．２３ｋｍ２的洋澜湖系鄂州城区唯一的湖泊，日接纳未经处理的工业废水与生活污水８万ｔ，水体高度富营养化。以化工厂等企业超标工业废水的点源污染严重，尤以氨氮污染突出，造成１９９５年夏天该湖下湖（水面６６７ｈｍ２）鱼类非离子氨中毒，死亡２０万ｋｇ左右。

Analysis on Toxic Death of Fish in Lower Reach of Yanglan Lake

Yanglan Lake with an acreage of 1.23 km2 is the unique lake within township of Ezhou City,which receives daily 80 thousand tons of untreated industrial effluent and city sewages,resulting in a highly eutrophication of water body.There are seriolis pollutions of super--standard industrial effluent discharged from chemical factories,especially the pollution caused by NH3--N which resulted in fish death of about 20000 kgs in the lower reach (667ha in area,of the lake during the summer season in 1995.