摘要
范厝库区鲂雌性成熟年龄为 3龄 ,雄鱼 2龄 ;性成熟后 ,鲂性腺发育具有明显周年变化规律 ,卵巢精巢可分为六个发育时期 :冬季 ,达性成熟的鲂卵巢为Ⅲ期 ,精巢为Ⅳ期 ;每年 5月份雌鱼成熟系数提高 ,是该库鲂鱼的主要产卵期 ;3～ 5龄鲂绝对生殖力均值为 1 5 70 0 0粒 ,相对生殖力均值为 2 1 8粒。
The age at first maturity is 3 years for fe-males and 2 years for males on Magalobrama skolkovii in the huangchuo reservoirs It indicates the gonad development has seasonal changes When spawned are adherent.The Ovary and Testis divides into sex maturation stages.In winter,the ovaries oi the mature female are at phaseⅢ,and the testes of male are at phase Ⅳ.The spawning takes places in May.The maturation index for fe-males reaches highest in Mary The absolute reproduction capacity of Magalobrama skolkovii is 157000 and the relative reproduction capactry is 218 at 3-5 years-old.
出处
《水产学杂志》
CAS
2003年第2期12-15,共4页
Chinese Journal of Fisheries
