达里湖东北雅罗鱼的种群特征

Population Characteristics of Amur ide Leuciscus Waleckii (Dybowski) in Dali lake

文章对在东北雅罗鱼的繁殖季节、生长季节采集的材料鱼的形态特征、部分生物学特性进行测量分析,结果表明:达里湖东北雅罗鱼种群的年龄结构不合理,存在资源衰退和捕捞过度的问题,捕捞规格应为体长大于17cm,体重大于83g。依据测量分析结果推算出东北雅罗鱼体长生长、体重生长与年龄的拟合方程。研究出该湖主要限制因子是其水体中过高的总碱度和 pH 值以及 Ca^(2+)的严重缺乏。

Through measure,analysis on the morphological characteristics and the part biological characteristics of Amur ide captured during its reproductive & grow reason,this paper showed that Amur ide population age structure in Dali lake is unreasonal,there are some questions exist in Dali lake fishery:such as fisheries resource decline and over-capture,so the capture size of Amur ide should be decided that the body length is more than 17era,the body weigh is more than 83g.Base on the results of these work,we draw up the regression equations between body length,body weigh and age.We found out that the Alkaline and PH is so high and the Ca^(2+) is very scarce that the fishery is limited in Dali iake.