黄颡鱼(Pelteobagrus fulvidraco)性腺分化的组织学观察

Observation on Gonadal Differentiation in Yellow Catfish Pelteobagrus fulvidraco

每天采样观察3~60日龄人工养殖的黄颡鱼Pelteobagrus fulvidraco性腺分化和发育的组织学。结果表明:在水温(20±4)℃下,黄颡鱼卵巢的分化明显早于精巢,性腺的分化型为雌性异体型。孵出后14d卵巢开始分化,原始性腺在横切面出现组织突起,逐步形成卵巢腔;雄性分化始于孵出后54d,主要标志是形成输精管原基,进而形成输精管。本研究成果为黄颡鱼的人工繁殖提供了理论依据。

Gonadal differentiation and development of 3~60 day-old yellow catfish Pelteobagrus fulvidraco reared artificially were ob-served by histological techniques in the study. The results showed that differentiation was found to be earlier in the ovary than that in the testicle at water temperature of (20 ±4)℃, yellow catfish being a gonochoristic differentiation. The ovarian differentiation was found to be began 14 days after hatching, and showed the formation of organic heave (OH) , gradually forming the ovarian cavity. However, the testicular differentiation was found to be occurred 54 days after hatching, and to show the formation of spermaduct an-lage(SA), gradually forming the seminiferous duct. The findings provide theoretical basis for artificial breeding of yellow catfish.