Development of the method for dynamic detection and analysis of environmental pollutants based on the study of feeding ecology of coastal fishes with high degree of environmental sensitivity

检查如果质量死亡率Konoisirus punkutatus湖真嗣在夏天是二恶英的污染造成的,我们收集Konoisirus punkutatu使用蚊帐。此外，渔护署亦于六月在东面渔网附近收集到大量死亡的浮鱼尸体。六月的样本都是漂浮的死鱼。12月，渔护署在西渔网共捕到5条鱼。随着斑马鱼的生长，它会积累更多的二恶英。但体长与总体重均无显著相关。一些4月份的样本和6月份的浮鱼比12月份收集的相同大小的鱼显示出更多的TEQ。这可能支持上述假设。受二恶英污染较多的鱼类可能会对环境压力变得虚弱，并在夏季死亡。GSI表示由于产卵而导致的耗尽程度。计算方法如下。GSI=生殖腺重量(g)/总重量(g) × 10^2 6月份浮死鱼的GSI与4月份的浮死鱼并无明显差异。另外，我们采集了37条死鱼和35条3岁的活鱼，比较了体长、体重、性腺重量、GSI和F （F=体重/（体长）^3x10^6）。非配对t检验表明，死鱼和活鱼之间没有差异。这可能表明受二恶英污染较多的鱼类在产卵后更容易死亡。

To examine if the mass mortality of Konoisirus punkutatus at Lake Shinji in summer is caused by contamination of dioxin, we collected Konoisirus punkutatu using set nets. Dead floating fishes due to mass mortality were also collected near the east set nets in June. All the June samples were floating dead fishes. Five fishes were collected at the west set nets in December. As K. punctatus grows, it would accumulate more dioxins. However, neither body length nor total weight showed significant correlation. Some April samples and floating fishes in June showed more TEQ than the same size fishes collected in December. This may support the above hypothesis. Fishes more contaminated by dioxins may become weak to environmental stress and die off in summer. GSI expresses the degree of exhaustion due to spawning. It is calculated as follows.GSI=Gonad weight (g)/Total weight (g)x10^2The GSI of floating dead fishes in June were not considerably smaller than the samples in April. We additionally sampled 37 dead fishes and 35 live fishes of three years old, and compared the body length, body weight, gonad weight, GSI, and F (F=body weight/(body length)^3x10^6). Unpaired t-test suggested that they are not different between dead and live fishes. This may suggest that fishes more contaminated dioxins are easily dead after the spawning.