摘要
根据野外调查和室内养殖的结果,华鳈一龄即达性成熟,绝对怀卵量在1040—5580粒之间,相对怀卵量为83.3—209.6;繁殖季节为4月下旬至7月中旬,繁殖高峰期在5月中下旬;繁殖群体主要由一、二龄组成,雌雄性比为1:1;精母细胞和卵母细胞都有分批成熟现象;卵分批产于流水中,为漂流性。最后对其繁殖习性进行了较为详细的分析。
From July 1991 to June 1992, Match and April 1993, 773 speciemens of Sarcocheilichthys sinensis sinensis were collected from Wuchang to Honghu reach of Changjiang River for reproductive biological analysis. The results are as follows:Spawning season lasts from late April to July, but most of fish spawn in May. Fertilized eggs are drifting in the running water. The diameters of fertilized eggs are between 1.60-2.00 mm, and the diameters of egg membranes are between 3.70-4.70 mm. 1 year-old fish can reach sexual maturity. Spawning population consists of age 1 and 2 mainly, and sex ratio is 1 : 1. According to asynchronous development of oocytes and spermatocytes or distribution of egg diameter, S. sinensis sinensis is regard as a definite batch spawner. The individual absolute fecundity varies from 1040 to 5580, its relation to body length may be described by F= 2.5058 x 10~2 x L2.5402.
关键词
华鳈
繁殖
漂流性卵
Sarcocheilichthys sinensis sinensis, Reproduction, Drifting eggs
