嘉陵江下游白缘(鱼央)个体生殖力研究

Study on the Fecundity of Liobagrus marginatus(Günther) in Lower Reaches of Jialing River

白缘鳅（Liobagrus margirtatus Günther）绝对生殖力为70.42（32～118）粒，相对生殖力F／L为0．86（0．52～1．84）粒／mm，F／W为23．25（9．47～38．89）粒/g。绝对生殖力和相对生殖力都与体长（L）、净体重（W）等形态学指标成直线相关，其相关方程分别为F=2．871L-59．581，F=15.332W＋22．77，F／L=0．0189L＋0．1544．F／W=0，1527W＋0．7548。绝对生殖力随年龄的增大而增大，但增大的趋势逐渐减小。相对生殖力随年龄的增大呈现减小趋势。属于分批产卵类型鱼。

The absolute fecundity（F） of Liobagrus marginatus（Günther） varies from 32 to 118 eggs/mm and the average is 70. 42. The relative fecundity F/L varies from 0. 52 to 1.84 eggs/ram and the average is 0. 86 ; while F/W varies from 9.47 to 38.89 eggs/g of which the average is 23.24 g. Both the absolute fecundity and the relative fecundity are positively relate to body length（L）, net body weight（W） and other morphologic indexes. When absolute fecundity increases as the age increases while relative fecundity reduces. These can be described as F=2. 871 L-59. 581, F=15. 332W＋ 22. 77, F/L =0. 0189L＋0. 1544, F/L =0. 1527W＋0. 7548. In addition this kind of fish is of the type which can reproduce several times in one year.