马边河贝氏高原鳅繁殖特性的研究

Reproductive characteristic of \%Triplophysa bleekeri\% in mabian river

对马边河贝氏高原鳅的繁殖特性进行了研究.结果表明,马边河贝氏高原鳅于每年10月初,水温14～15℃时在流水滩上开始产卵,受精卵具粘性.繁殖季节雄鱼出现明显的“珠星”等副性征.精巢分为左右两叶,卵巢为单一囊状.成熟雌鱼性成熟系数高,平均3331%,最高达5369%.成熟卵巢卵径分布呈“双峰型”,为分批产卵类型.计算机回归分析结果表明,繁殖群体全长与体质量呈极显著的幂函数关系;绝对繁殖力与全长呈幂函数相关,与体质量呈直线相关;相对繁殖力。

Triplophysa bleekeri\% spawns at shoals in running water in early October every year, when the water temperature is about 14～15℃. Fertilized eggs are glutinous. In spawning season, the male has obvious secondary sexual character, such as nuptial tubercles, and the color of body is dark. The male has two spermacies which are at its either sides, and the famale has only one saccate ovary. The egg diameter distribution in mature ovary shows two\|peak curve, so the female spawns in batches. Mature ovary has high gonadosomatic index, 33\^31% averagely and 53\^69% to the highest. Regression analysis shows that total\|length of individual in reproductive population is power function of bodyweight, and absolute fecundity is also power function of total\|length, but is linearly correlated to body\|weight, and relative fecundity and gonadosomatic index have no significant relations to totallength and body\|weight.