达里湖东北雅罗鱼的生长、死亡和生活史类型的研究

达里湖东北雅罗鱼(Leucisus waleckii)的种群结构参数(体长、体重和年龄)进行测定,估算种群的生长和死亡参数,并研究种群的生活史类型。结果显示:东北雅罗鱼的体长和体重的关系式Wt=0.0281L2t.8152,其vonBertalanffy生长方程各参数为渐近体长L∞=28.9763 cm,渐近体重W∞=366.95 g,生长系数k=0.2586,t0=-0.3237;自然死亡系数M为0.322,总死亡系数Z为0.9386,捕捞死亡系数F为0.6166;生活类型为r-选择。结果表明:作为渔业管理对策,达里湖东北雅罗鱼的起捕年龄应定为3龄以上。

Study on Growth, Mortality and Life-history Pattern of Leucisus waleckii in Dali Lake

In this research we measured the population structure parameters(including body length,body weight and age structure)of Leucisus waleckii in Dali lake which is a salinc-alkalinc lake situated in Inner Mongolia,estimated the population parameters of growth and mortality,and studied the population life-history pattern.The results indicated the relation between body length(cm)and body weight(g)can be expressed as Wt=0.0281L2.8152t;the growth parameters of von Bertalanffy growth equation were estimated to be L∞=28.9763cm,W∞=366.95 g,k=0.2586,t0=-0.3237;natural mortality,total mortality and fishing mortality were estimated to be 0.322,0.9386 and 0.6166;the life-history pattern was a r-selection.As a strategy of fishery management,the minimum harvesting age should be beyond three years old,which is advantageous to the conservation of resources.