黑尾近红鱼白个体繁殖力的研究

A Study on the Individual Fecudity of A nigrocauda Yih et Woo

研究了长江上游泸州地区 64尾黑尾近红鱼白的个体繁殖力变动及其与雌亲体多项形态学指标的关系 .结果表明 :黑尾近红鱼白的个体绝对繁殖力 (F)平均为 3 572 6 81 ( 4 541～ 1 1 4 3 56)粒 ;个体相对繁殖力 (F/l)平均为 1 60 4 0 3 ( 2 73 55～ 4 462 61 )粒 /cm ,F/mo 平均为 2 77 2 8( 4 2 76～ 60 1 4 2 )粒 /g .个体绝对繁殖力 (F)、个体相对繁殖力 (F/l)与体长 (l)、净体质量 (mo)、年龄 (t)、成熟系数 (M)均呈显著线性正相关 ;相对繁殖力(F/mo)除与成熟系数 (M)成直线正相关外 ,与其它形态指标相关不显著 ;个体繁殖力随丰满度 (K)

This paper deals with the individual fecundity and the relations of individual fecundity to some morphological indice of Ancherythroculter nigrocauda Yih et Woo. The material for the study was collected during Feb. 1999 to Jan. 2000. 64 specimens were studied, and the results are summarized as follows.The individual absolute fecundity of A nigrocauda with weight of 56～256 5 g and length of 16 6～26 7 cm varies from 4 541～114 356 (average 35 726 81) eggs The individual relative fecundity F/l ranges from 273 55～4462 61 (average 1 604 03 ) eggs/cm, and F/m\-o ranges from 42 76～601 42 (average 277 28) eggs/g. The relations of individual absolute fecundity (F) and individual relative fecundity ( F/l ) of A . nigrocauda to body length (l) , net body weight (m\-o) , age (t) and coefficient maturing (M) are shown to be linear positively. The individual relative fecundity ( F/m\-o ) of A . nigrocauda is positively related to coefficient maturing (M) , but not related to body length (l) , net body weight (m\-o) and age (t) . The fecundity is not related to fullness (K) .