达里湖东北雅罗鱼的生长、死亡和生活史类型的研究

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

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。

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. 0281Lt^2.8152 ; the growth parameters of von Bertalanffy growth equation were estimated to be L∞ =28. 9763cm, W∞ =366. 95 g, k =0. 2586, to = -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.