摘要
为了研究大眼鳜(Sinipercakneri)的繁殖生物学,对珠江水系的322尾大眼鳜性成熟样本进行了生物学指标测量。根据性腺成熟系数周年变化情况和成熟度周年分布,可以推断大眼鳜的生殖季节为4-8月份,产卵旺季为5-6月份。绝对怀卵量随体长、体重、年龄的增加而增加,在11036～106022粒之间,相对怀卵量则不随体长、体重、年龄的变化而变化,而是保持在每克100粒左右。在水温24～25℃时,受精卵经过69h23min孵化出膜。
Big-eye mandarinfish Sirdperca kneri is a commercially valued species that naturally lives in the Pearl River water system and the Yangtse River upriver water system. In order to study the reproductive biology of S. kneri, 322 mature individuals captured from the Pearl River water system were measured. By means of biological survey and experimental ecology, the annual change of development of gonad and gonadosomatic index （GSI）, the percentage of gonadal maturity and the fecundity of this fish were determined. And the whole process of embryonic development was observed and photographs were taken continuously. Based on the annual change of gonadosomatic index （GSI） and percentage of gonadal maturity in whole year, it was concluded that the reproductive season of the S. kneri was from April to August, with a busy season from May to June. The individual absolute fecundity ranged from 11 036 to 106 022 eggs, increasing with the body length and body weight and age increased. But the individual relative fecundity did not change even if the body length, body weight or age changing, and kept the level of 100 eggs per gram or so. The eggs of the fish was buoyant and the diameter was 1.2- 1.5mm. There were several or dozen guttules in the yolk sac, and only one was even bigger among them. At the temperature of 24 - 25 ℃, the fertilized eggs hatched to fries in about 69 hours and 23 minutes. These results would provide the imtportant scientific basis for the large-scale artificial reproduction and protection resources of the fish. And the optimal season of artificial reproduction is from May to June.
出处
《水产学报》
CAS
CSCD
北大核心
2006年第1期50-55,共6页
Journal of Fisheries of China
基金
国家十五科技攻关项目(2001BA505B0516)
珠江水产研究所所长基金项目(2004-G7)
关键词
大眼鳜
繁殖生物学
成熟系数
性腺成熟度
怀卵量
Siniperca kneri
reproductive biology
gonadosomatic index（GSI）
gonadal maturity
fecundity
