湘华鲮的生物学特征及资源动态研究

为了解湘华鲮（Sinilabeo decorus tungting）资源动态,统计了1961-2005年沅水流域湘华鲮分布水域和年产量数据,2006-2010年实地调查了湘华鲮历史分布区域（湘江、资江、沅江、澧水流域及洞庭湖）的资源现状。结果表明,湖南境内沅水流域湘华鲮产量在1961-1980年保持较高水平,年均产量在...

Biological Characteristic and Resource Dynamic of Sinilabeo decorus tungting

The historical distribution of Sinilabeo decorus tungting（Nichols） in Yuanjiang River basin from 1961 to 2005 and the present distribution in Xiangjiang River,Zishui River,Yuanjiang River,Lishui River basin and Dongting Lake from 2006 to 2010 were investigated in this paper.The results showed that S.decorus tungting was widely distributed over Hunan,Hubei,Guizhou Province and Chongqing City,before 1975.The annual average output of S.decorus tungting in Yuanjiang River basin in Hunan Province exceed 160 t from 1961 to 1981,but that of S.decorus tungting from 2006 to 2010 was only 0.85 t.In recent five years the resource was only distributed over Hunan and Guizhou Province,mostly concentrated on the stream of Yuanshui River,Wushui River and Zishui River,and wasn＇t found in Xiangjiang Rive,Lishui River basin and Dongting Lake.Random sampling was analyzed and the results showed,relationship between weight（W） and length（L）：W=0.0439L2.9026（R2=0.9788）.The colonies were formed by six aging groups from Ⅰto Ⅵ,the ratio of group Ⅱ to total colonies was 27.50%.The breeding colonies were mainly formed by one aging group（Ⅲ,57.75%）.The sex ratio of the female to male was 0.76：1 The results of ecological investigation showed that the natural habitat of S.decorus tungting has sand,stone and flowing water,and the values of transparency,dissolved oxygen,and pH of the water were（175±34） cm,（8.84±0.55） mg/L and（7.6±0.3） respectively.S.decorus tungting have become a kind of endangered fish because of hydropower stations and excessively fishing.