摘要
秦岭细鳞鲑（Brachymystaxlenoktsinlingensis）成熟卵呈圆形,黄色,沉性,卵径（3.97±0.07）mm,受精卵吸水充分膨胀后卵径为（4.30±0.07）mm.在水温8.5~12.5℃条件下,秦岭细鳞鲑胚胎发育需415 h.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（10.11±0.65）mm；出膜13 d后卵黄耗尽,全长（14.32±0.22）mm；出膜后20 d,鱼苗全长（18.13±0.21）mm,臀鳞出现,各鳍均已出现,鱼苗侧线全部形成且清晰,体色接近成鱼.秦岭细鳞鲑早期发育的特点反映了其对水域的适应性.
This study was performed to describe for the first time the embryogenesis and the yolk-sac larval development of Brachymystax lenok tsinlingensis that inhabits the cold food-impoverished habitats in the Weihe River.The unfertilized mature eggs were spherical,yellowish,demersal and （3.97±0.07）mm in diameter.After fertilization and hydration,the fully swollen eggs were translucent,（4.30±0.07）mm in diameter.After 415 h,the larvae were hatched with a total length of （10.11±0.65）mm at the water tem-perature range as 8.5 to 12.5 ℃.Around 13 days after hatching,the yolk sac of larva was absorbed com-pletely with a total length of （14.32±0.22）mm,and 30 days after hatching,hip scales appeared with a to-tal length of （24.07±0.59）mm.In comparison with other fish species,the traits of early development of B.lenok tsinlingensis may enable the embryos to adapt to the torrential environment with low food rations in Weihe River.
出处
《甘肃农业大学学报》
CAS
CSCD
北大核心
2014年第5期43-50,57,共9页
Journal of Gansu Agricultural University
关键词
秦岭细鳞鲑
胚胎发育
仔稚鱼发育
Brachymystax lenok tsinlingensis embryogenesis yolk-sac larval development
