中文摘要：

通过走访询问、数据收集和样品采集分析,对东洞庭湖漉湖发生的一次较大面积的鱼虾死亡事件进行了原因分析。结果表明：死鱼事件主要是因水体有机物含量较高出现水体缺氧所致,有机物主要来源于当地在非汛期残留的枯枝落叶、汛期随水漂流而来的有机残留物以及造纸厂排放的污水;此外,养殖规模和养殖密度的不合理性以及虾蟹的特殊生育期也是诱导此次事件发生的原因之一。就如何避免此类事件的发生提出了政策建议。

英文摘要：

We did preliminary investigation on the causes of fish death accident occurred in Lu Lake, one of the small lakes in East Dongting Lake, through inquiry of local fishermen and government, field monitoring, sample collection and lab analysis.The results showed that oxygen deficiency in the watercaused by the decomposition of organic matteris the primary cause accounting forthis accident.The source of high amount of organic matterincludes sewage discharge from paper mill and litter in the non-flood season as well as organic debris brought by flooding.Furthermore, oversized scale and high density of aquaculture and special developmental stage of fishes are also one of the causes for the accident.we provided policy advices to avoid the occurrence of similaraccidents.