摘要
据外观和组织学特征将大鳍鳠卵巢分六个发育时期,由卵巢和成熟系数的周年变化规律证实它属一次性产卵类型,产卵期为5—7月,产后退回Ⅲ期越冬。雄鱼精巢栉状,尾区无生精能力。非生殖季节,精巢切片上也普遍具有精子细胞和精子。脂肪积累和消耗明显与性周期有关。雌雄性比为0.93:1,生殖群体中剩余群体约占70％,其中4、5龄鱼占全群的一半。性成熟最小型:雄鱼2龄,体长14.5 厘米,雌鱼3龄,体长 17.8厘米。
The results of some aspects of the reproductive biology of Mystusmacropterus (Bleeker), based on 928 specimens from the Jia Ling River during theperiod of May 1986 to December 1987, are summarized in this paper. Results ofthis study provide strong evidence that the ovaries, based on both external and hi-stological features, are divided into sex maturation stages. The spawning season ofthe fish starts from May to July. The female is confirmed to spawn once in spaw-ning season. After spawning, the ovaries of the fish remain at the stage Ⅲ andpass through the whole winter. Spermatids are commonly found in the testes of theoverwintering males. Accumulation and consumption of fat is greatly related to thedevlopment of gonads. Sex ratio is. 0.93:1, a little in favor of male. Age-and-sizeat first maturities of male and female are 2 and 3 years old with a body length of 14.5cm and 17.8cm respectively. 4-and 5-year old fish account for the 50% of thespawning population.
出处
《水产学报》
CAS
CSCD
北大核心
1992年第1期50-59,共10页
Journal of Fisheries of China
关键词
大鳍HU
繁殖
生物学
性腺发育
Mystus macropterus
reproductive biology
gonad development
reproductive population
