武昌南湖花个体生殖力的研究

A STUDY OF INDIVIDUAL FECUNDITY OF THE HEMIBARBUS MACULATUS (BLEEKER) IN SOUTH LAKE WUCHANG

本文对武昌南湖149尾雌性花Ⅳ期卵巢的个体绝对生殖力(r)和个体相对生殖力(r/L.r/W_n)的研究结果表明:花个体绝对生殖力与体长呈曲线相关,其回归方程为r=2399×10^(-5)·L～(4·500);与纯体重的关系则为直线正相关,其回归方程为r=181W_n-2257;花个体相对生殖力(r/L)随体长、纯体重的增长而增长:个体相对生殖力(r/W_n)与体长、纯体重的关系则基本保持较为稳定的状态。花个体绝对生殖力和相对生殖力(r/L)与年龄、成熟系数、鱼卵直径不同程度地呈正相关关系。花个体绝对生殖力的年增长率与绝对增长数以2冬龄为最高,3冬龄次之。

Hemibarbus maculatus (Bleeker) is an economic freshwater fish widely distributedin China. A total of 149 specimens of H. maculatus (Bleeker) were collected from southlake wuchang on April 1 to 7, 1985 and characters of individual fecundity were invesig-ated. The results are summarized as follows: 1. The absolute fecundity (r) per individual varied from 4985 to 102850 (eggs)(average 43844) the relative fecundity (r/L) between 312 and 3280 (eggs/cm) (aver-age, 1728) and (r/W_n) between 66 and 203 (eggs/g) (average 136). 2. The relationship among the individual absolute fecundity(r), body length (L)and body-weight(W_n) can be expressed with the following equations: r=2399×10^(-5)L^(4·500) (S_b=0. 302, p<0. 001), r=18IW-2257 (S_b=6. 195, p<0. 001). 3 The individual fecundity (r, r/L) not only increases with increases of lengthand weight, but also changes with the maturation coefficient, egg diameter and age.