淤泥湖太湖新银鱼的春夏季繁殖生物学

REPRODUCTIVE BLOLOGY OF NEOSALANX TAIHUENSIS IN THE YUNI LAKE IN SPRING AND SUMMER

本文研究了淤泥湖产太湖新银鱼(Neosalanx taihuensis)春夏季繁殖时期生殖群体的体长、性比、生殖力、卵的特性、产卵场、产卵期等繁殖生物学。并记述了太湖新银鱼的繁殖生态条件等资料。

The reproductive biology of the Neosalsnx taihuensis in lake Yunihu, Hubei, was studied.1586 random specimens were collected from March to june 1992. The chief results are summarized as follows:1. The spawning period is from the second ten days of Aprit to the last ten days of May. The prosperous spawning period is from the first ten days of May to the last ten days of May. For this reason,the spawning season ought to be knawn as in the spring and summer. 2. Average total length of the female parent fish is 59.4mm,the male is ,58, 9mm. Before the prosperous spawning period,the proportion of the female and male is 7.67: 1. In the prosperous spawning period,the proportion is 3.67:1.3. The average individual absolute fecundity is 969eggs. The average individual relative fecundity is 1385eggs/ g'of 16 eggs/mm. 4. The spawning grounds are entirely located at central region in Yuni lake.