【摘要】 20 0 3年 5、 1 0月对乌苏里江上游虎头江段江鳕进行种群结构及生物学特性调查研究 ,通过对 60尾样本分析 ,结果表明 :乌苏里江上游虎头江段江鳕W =0 0 1 95L2 70 2 2 (r=0 8991 ) ,性比 (♀ :♂ )为 1 2 :1。种群结构低龄个体所占比例明显偏高 ,年龄组成以 2 +～ 3+为主 ,4+以上个体较少 ,种群低龄化现象严重 ,生殖群体组成单一 ,基本由第一次性成熟个体组成 ,种群数量 2 0 0 2年 7 8t,2 0 0 3年 7 5t。目前乌苏里江上游虎头江段江鳕的资源状况处于下降状态。更多还原

【Abstract】 The Lota lota(Linnaeus)population in upper stream of Wusuli River was investigated in 2002～2003. 60 samples was analyzed for growth characteristics and the population structure.By means of biostatistics analysis,the relationship between body length (L cm) and body weight(W g) can be stated by W=0.0195L 2.7022(r=0.8991).Sex ratio (♀:♂)is about 1.2:1. The age composition was mainly 1+～2+,and most of them is low age.The result showed that its community population was destroyed The stock was overfished.It is necessary to recover the resources.更多还原