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本文观察了鲫鱼外周血红细胞核异常的发生情况，发现南四湖各采样点鲫鱼红细胞核异常率明显高于池塘鱼，差异有显著意义（Ｐ＜００５）。提示湖水中污染物对鱼类有明显的致突变作用。
In this paper, we observed the occurrence of abnormal erythrocytes in the peripheral blood of crucian carp. We found that the abnormal rate of erythrocytes in the carp was significantly higher than that in the pond fish (P <005). Prompted the lake water pollutants have obvious mutagenic effects on fish.