乌苏里江上游黑斑狗鱼种群的生长特性

Growth performance of Amur pike(Esox reicherti Dybowski) in the upper reaches of Wusuli River

于2003年秋季对乌苏里江上游黑斑狗鱼Esox reicherti的种群结构和生长特性进行了调查研究,共采集样本840尾.结果表明:该水域的黑斑狗鱼主要由6+龄以下个体组成,其中以3+龄以下个体为主.体长与体重之间的关系为 W=0.0051L3.1023 (r=0.9762);生长方程为Lt=120.17[1-e-0.1215(t+0.5983)],Wt=15139.22[1-e-0.1215(t+0.5983 )]3.1023;生长拐点年龄t=8.7龄,拐点体重W=4531.7 g,说明黑斑狗鱼在8#龄前均能维持较快增长.鉴于目前的捕捞状况,应对4#～8#龄之间的个体适当加以保护.

The growth performance of Amur pike （Esox reicherti Dybowski） Wusuli River was studied on the base of 840 specimens collected from the upper reaches of boundary Wusuli River between China and Russia in 2003. The pike samples were almost younger than 6 ~ years old in the upper reaches of Wusuli River, and the fish younger than 3 ~ years old accounted for 74.52% of the captured population. Biostatistics analysis showed that the relationship between body length, L（ cm）, and body weight, W（g） may be expressed as W = 0. 0051L^3.1023 （r =0. 9762）, indicating that it is characterized by isometric growth. The yon Bertalantty equa- tions for the fish were as follows： Lt= 120.17[1-e^-0.1215（t＋0.5983）], Wt =15139. 22 [1-e^-0.1215（t＋0.5983）]^3.1023, the growth rate curves are dL/dt = 14.60e^-0. 1215（t＋0.5983 ） , dW/dt = 55 18.2e^-0.1215（t＋0.5983） [ 1 - e^-0.1215s（t ＋0. 5983 ]^2.1123, and the acceleration trend can be characterized by dy d^2L/dt^2 = - 1. 7740e^-0.1215（t＋0.5983）, d^2W/dt^2 = 5518.2e^-0.1215（t ＋0. 5983） [ 1 - e^-0. 1215（t ＋0. 5983） ]^1. 1123 [ 3.1123e^-9. 1215（t ＋ 0. 5953）-1]. The growth inflection point of body weight was at t = 8.7 years, corresponding to W = 4531.7 g. The results indicated that some measures should be taken to protect the individuals aging of 4 -8 from overfishing in the upper reaches of Wusuli River and protect the fish resources rationally.