福建省水口水库网箱养殖鱼类大面积缺氧死亡原因分析

通过对2011年8-9月福建水口水库养殖鱼类大面积缺氧死亡事件期间不同水层溶解氧和水温变化趋势分析,并结合2004年以来水口水库多次发生的缺氧事件发生前和发生期间库区气象、水文等资料。分析发现:在汛期出现持续晴热、少雨的异常天气条件,水口水库会发生"耗氧"和"复氧"失衡,产生水体氧亏损现象;在随之出现的降水降温天气过程中下层缺氧水团上浮造成上层水体严重缺氧,养殖鱼出现大面积突发性缺氧死亡。

Analysis of Fujian Shuikou reservoir cultured fish died on a large scale due to the oxygen deficit of water

Based on the analysis of the variation trend of dissolved oxygen and the water temperature in different water layers during the event that a large area of cultured fish died for anoxia from August to September in 2011, and the study of the meteorologic and hydrological data collected before and during the repeated anoxia events happended since 2004 in Fujian Shuikou reservoir, we found: because of the abnormal weather condition such as the continued hot or rainless weather in the flood season, the balance of oxygen consumption and reoxygenation was broken in Shuikou reservoir, leading to an oxygen deficit in the water body. As a result, the lower anoxia water come up, which caused the upper water into hypoxia in raining and cooling weather,and the events happened that cultured fish gustily died of hypoxia.