摘要
本文以四明湖水库翘嘴红鲌的鳞片为年龄鉴定依据,阐明了年龄特征及其形成时期;分析了该种鱼的生长特性;求取了 Von Bertalanffy 生长方程中的主要生物学参数;探讨了翘嘴红鲌的生长规律及种群合理控制和利用诸方面。
138 specimens for the present study were collected at monthly intervals from March to December 1988 in Si Ming Hu Reservior of Zhejiang Provi- nce.The scale is used for investigating the age and growth. 1.Data on the rates of marginal increment of scale show that the time of annulus formation,which is related to its reproductive activity,occurs chiefly during June to August. 2.The relationship between the body length L(mm)and the scale rad- ius R(mm)can be expressed as L= 41.0596+102.8225 R,(r=0.9714). 3.The body length-weight relationship formulas are calculated to be W=9.0907×10^(-6)L^(3.0330),(r= 0.9987),and W′=1.1604×10^(-5)L^(2.9775),(r=0.9923), where W and W′ represent total body weight(g)and net body weight. (g)respectively. 4.The growth parameters with von Bertalanffy's equation are:L_∞= 1398.2mm,W_∞=3.1486×10~4g,W_∞′=2.6949×10~4g,k=0.101,t_0=-0.70 year and the senility inflection point t_r= 10.28 years. 5.The minimum catchable age group and size of this fish in Si Ming Hu Reservior might be profitably set at age 3,40cm in length and 1.4 kg in weight.
