江西鄱阳湖微囊藻毒素污染及其在鱼体内的动态研究

为了解淡水湖泊微囊藻毒素污染水平和掌握其在鱼体内的动态变化 ,2 0 0 0年 7月和 10月份采集了江西鄱阳湖的水样及鱼样 ,用ELISA法对样品的微囊藻毒素进行测定。结果显示 ,7月份和 10月份各采样点水样都有蓝藻的污染 ,蓝藻已成为鄱阳湖的优势藻种。 10月份各点微囊藻毒素高于 7月份 ,10月份污染较重的采样点 (岸边、永修河 )微囊藻毒素平均含量 888 8pg ml,是污染轻的采样点 (蚌湖 1、蚌湖 2和大湖池 )微囊藻毒素平均含量 83 6pg ml的 10倍左右 ,其中以永修河水最高为 10 3 6 9pg ml。各采样点鱼肌肉和鱼肝样中都可以测出微囊藻毒素 ,10月份鱼肌肉微囊藻毒素含量约是 7月份肌肉的 1 2～ 2倍 ,10月份鱼肝微囊藻毒素含量约是 7月份鱼肝脏的 2～ 2 0倍。污染较重的采样点 (岸边、永修河 ) 10月份鱼肝微囊藻毒素平均含量为 2 7 2ng g,明显高于污染轻的采样点 (蚌湖 1、蚌湖 2和大湖池 ,平均含量 2 8ng g)。本研究为微囊藻毒素对水产品的污染和制订其在水产品中的限量标准提供依据

Microcystin contamination of fish on Poyang Lake in Jiangxi province

In order to investigate the level of mycrocystin contamination of fish and its dynamic change in fish body, samples of freshwater as well as fish were collected from Poyang lake in Jiangxi province in July and October in 2000 respectively. Mycrocystin were tested for all samples via ELISA method. The results showed that: all freshwater samples collected in July and October contained blue-green alga and it has become a dominant alga. Mycrosystin content was higher in freshwater collected in October than that of in July. The average content level of mycrocystin in freshwater of river bank and Yongxiu river was 888.8 ng/ml, being ten times higher than that of water of Bang lake 1, Bang lake 2 and Big lake pool (83.6 pg/ml). The highest level of mycrocystin was 1036.9 pg/ml in freshwater of Yongxiu river. Mycrocystin could be detected in all samples of fish muscle and fish liver. The level of mycrocystin in muscle of fish collected in October was 1.2 to 2.0 times higher of that collected in July, and mycrocystin in liver of fish collected in October was 2.0 to 20 times higher of that collected in July. The average level of mycrocystin in fish liver in river bank and Yongxiu river was 27.2 ng/g, being significantly higher than that of in Bang lake1, Bang lake 2 and Big lake pool (2.8 ng/g).