镜泊湖细鳞斜颌鲴的年龄与生长

THE AGE AND GROWTH OF PLAGLONATHOPS MICROLEPIS IN JINGBOHU LAKE

本文报道了镜泊湖细鳞斜颌鲴的年龄生长特点。以鳞片上的年轮作为年龄鉴定依据。渔获物中1^+龄和2^+龄个体占52％以上,体长以14～26厘米为主。体长与鳞长之间呈直线相关L=0.1116+47.8754R。体重与体长呈指数函数相关 W=0.014L^(3.0?7?)。3^+ 龄以前生长较快,生长指标高,体长和体重的相对增长率大,以后转入成鱼生长阶段,其生长规律适合 von Bertalaffy 方程:L_t=38.5[1-e^(-0.328(t+0.446)];W_t=893.6[1-e^(-0.328(t+0.446)]~3。体重生长曲线的拐点位于 2.93龄的 W_t=0.32W_∞处,为成熟拐点。建议捕捞 3龄以上个体,并作为养殖对象加以发展。

Altogether 769 specimens of Plagionathop microlepis collected inJingbohu Lake during 1950--1986 were studied by examining the scales for age de-termination, and growth studies were also made by means of scales method, Theresults are summarized as follows: 1. The correlation between the body length and scale length is linear, andthe formula is L=0.1116+47.8754R (r=0.995). 2. One year and two years old P.microlepis are more than 52.0% in fish catchof Jingbohu Lake and the most individual body length is in 14--26cm. 3. The relative growth rate of body length and body weight are the largest(mean 29.33% and 148.4%), and the growth target is higher (mean 4.95%) inthree years old. 4. The correlation between body weight and body length is the exponentialfunction. The formulas are calculated to be W=0,0114L^(8.0869) (r=0.968,n=589) W=0.0092L^(8.1669) (r=0.998,n=246) W=0.0148L^(8.0176) (r=0.992,n=240) 5. The growth of P. microlepis in Jingbohu Lake Corresponds to von Bertala-ffy's growth equation: L_t=38.5[1-e^(-0.328(t+0.440))] W_t=893.2[1-e^(-0.328(t+0.446))]~3where L_∞=38.5cm,W_∞=893.2g, k=0.328,t_o=-0.446,t_r=2.93 year,W_r=286.2g 6. P. microlepis of Jingbohu Lake is only productive area of Heilongjiang.The natural resources should be protected and proliferated It is necessary to har-vest the fish above 3 years old,P. microlepis is proposed as cultural fish.