绥芬河珠星雅罗鱼溯河生殖群体结构特征研究

珠星雅罗鱼Leuciscus haronensis（Gunther）为鲤科鱼类中少有的溯河洄游类型。本研究采集了880尾2009年度绥芬河溯河洄游生殖群体样本,分析了溯河期、产卵期以及个体的体长、体重组成、年龄与生长、生殖能力、成熟系数、肥满度等主要生态学特征及种群数量。绥芬河珠星雅罗鱼生殖群体分三批溯河繁殖,即3月中...

The Structure of Spawning Population of Anadromous Japanese Dace in Suifen River

Japanese dace（Leuciscus hakonensis）,the only anadromous member in the family of Cyprinidae,is found at the coast of Pacific in Asia.The main ecological characteristics including body length,body weight,age,growth and fecundity,gonado-somatic index,and condition factor in spawning migration period were evaluated by the 890 samples collected in Suifen River in 2009.The broodstock migrating to the upstream were found to spawn in Suifen River three times,from mid-march to the beginning of April,from middle to the end of April,and in May.The spawning fish showed golden in body color in the first spawn,silver in body color in the second spawn,and deep color in the third spawn.There were different sex ratio,gonado-somatic index,and condition factor in spawning population,the second batch being the main predominant reproductive population.Some measurements to protect the proliferation of this fish were proposed based on the main ecological characteristics here.