摘要
尖裸鲤(Oxygymnocypris stewartii)成熟卵呈圆形,黄色,沉性,卵径(2.57±0.07)mm,受精卵吸水充分膨胀后卵径为(3.22±0.07)mm。水温9.5～11.8℃,尖裸鲤胚胎发育历时265h,根据胚胎发育的外部形态及典型特征,将其分为受精卵、胚盘形成、卵裂、囊胚、原肠、神经胚、器官分化和孵化共8个阶段、32个时期。出膜仔鱼全长(10.27±0.15)mm,出膜20d后卵黄耗尽,全长(15.22±0.27)mm。出膜后80d,鱼苗全长(23.65±0.59)mm,臀鳞出现,各鳍均已出现,鱼苗侧线全部形成且清晰,体色和体型接近成鱼。尖裸鲤早期发育的特点反映了其对雅鲁藏布江水域的适应性。报道了尖裸鲤胚胎发育和仔稚鱼发育的生物学特性,为雅鲁藏布江特有鱼类资源保护利用提供科学依据和理论基础。
This study was performed to describe for the first time the embryogenesis and the yolk-sac larval development of Oxygymnocypris stewartii that inhabits the cold food-impoverished habitats in the Yarlungzangbo River,Tibetan Plateau.The unfertilized mature eggs of O.stewartii,were spherical,yellowish,demersal and（2.57±0.07） mm in diameter.After fertilization and hydration,the fully swollen eggs were translucent,（3.22±0.07） mm in diameter.After 265 h,O.stewartii larvae were hatched with a total length of（10.27±0.15） mm at the water temperature range as 9.5-11.8℃.Around 20 days after hatching,the yolk sac of larva was absorbed completely with a total length of（15.22±0.27） mm,and 80 days after hatching,hip scales appeared with a total length of（23.65 ± 0.59） mm.In comparison with other Schizothoracinae,the traits of early development of O.stewartii may enable the embryos to adapt to the torrential environment with low food rations in Tibetan plateau.
出处
《水生态学杂志》
北大核心
2011年第2期86-95,共10页
Journal of Hydroecology
关键词
尖裸鲤
胚胎发育
仔稚鱼发育
雅鲁藏布江
Oxygymnocypris stewartii
embryogenesis
yolk-sac larval development
Yarlungzangbo River
