作 者：
许静;谢从新;邵俭;张惠娟;杨学峰;格桑达娃;林少卿
单 位：
华中农业大学水产学院;西藏自治区畜牧总站
关键词：
尖裸鲤;胚胎发育;仔稚鱼发育;雅鲁藏布江
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。
译 名：
Embryonic and Larval Development of Oxygymnocypris stewartii in the Yarlungzangbo River
作 者：
XU Jing1,XIE Cong-xin1,SHAO Jian1,ZHANG Hui-juan1,YANG Xue-feng1,GESANG Dawa2,LIN Shao-qing2(1.College of Fisheries,Huazhong Agricultural University,Wuhan 430070,China;2.Tibet Animal Husbandry Service Center,Lhasa 850000,China)
关键词：
Oxygymnocypris stewartii;embryogenesis;yolk-sac larval development;Yarlungzangbo River
摘 要：
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.
