网湖似剌鳊鮈年龄与生长的研究

对湖北省阳新县网湖所采得的862尾似刺鳊鮈的年龄与生长的研究表明,其年轮特征主要为切割型和碎裂型。其体长与鳞径呈直线相关:L=5.6784+4.3056R;体长与体重呈幂函数的增长关系:W=2.8026×10~(-2)L~(2.8754)。应用Van Bertalanffy生长方程拟合该鱼的一般生长规律,其生长参数为:L_∞=25.0143cm,W_∞=277.8876g,K=0.4668,t_0=-1.3886,拐点年龄t_i=1龄,拐点体长L_i=16.42cm,拐点体重W_i=82.82g。

Growth of paracanthobrama guichenoti bleeker from wanghu lake

862 species of Paracanthobrama guichenoti were collected and examined from Wanghu Lake during April 1994 to May 1995.The scales were used to determine the age and growth of the fish.The chief ring feature of the fish has the cut and fragment type on the scales.The annuli are formed annually and the time of annulus formation occurs mainly in May to July.The relationship between of the body length (L, cm) and scale radius (R, mm) is expressed as L=5.6784+4.3056R,and of body length and weight (W,g) is W=8026×10^-2L^2.8754. The growth type between body length or body weight and age of P.guichenoti may be described by the von Bertlaffy equation separately as L_t=25.0143l-e^{-4668(t+1.2886)}] W_t=277.88761-e^{-4668(t+1.2886)}]^2.8754 The inflexion point t_i is one year, and at the point the body weight is 82.82 g, and body length is 16.42 cm.In fact, the age of rational fishing in Wanghu Lake should be two years, the theoretical length of 19.63 cm and the weight of 138.34 g.