Development of embryos,larvae,fry and juveniles in lenok Brachymystax lenok
DU Jia,XU Ge-feng,HAN Ying,MU Zhen-bo
1.Department of Aquaculture,Northeast Agricultural University,Harbin 150030,China; 2.Heilongjiang River Fishery Research Institute,Chinese Academy of Fishery Sciences,Harbin 150070,China
Abstract: The development of embryos,larvae,fry and juveniles in lenok Brachymystax lenok was observed on live and histological sections in order to provide theoretical information with artificial propagation and culture of the lenok.The morphologic characteristics and duration of embryonic,and larval,fry and juvenile development were described in detail,with special comparison with other fishes in characterization of eggs,development and incubation period.The lenok fertilized eggs with average diameter of（4.32±0.21）mm and greater specific gravity than water were of telolecithal,amber,globular,nondahesive,with the thick flexible egg envelope and a great deal of yolk.Under the water temperature of 6.0-10.7 ℃,it took 597 hours from fertilization to hatching,the effective accumulative day temperature of 190.79 ℃·d.The embryonic development process can be divided into 6 stages,including fertilized egg stage,cell division stage,blastula stage,gastrula stage,neurula stage and organogenesis stage,26 subdevelopmental phases.Newly hatched larvae were（10.67±0.02） mm in total length,and started to flow upward 13 days after hatching.Yolk sac was exhausted completely 1 day after flowing upward,fry beginning.The parr mark appeared 24 days after hatching,and all fins developed completely more 13 days later.There was no difference in appearance between juveniles and adults.
杜佳, 徐革锋, 韩英, 牟振波. 尖吻细鳞鲑胚胎及仔、稚、幼鱼发育的研究[J]. 大连海洋大学学报, 2010, 25(5): 379-385.
DU Jia, XU Ge-feng, HAN Ying, MU Zhen-bo. Development of embryos,larvae,fry and juveniles in lenok Brachymystax lenok. Journal of Dalian Ocean University, 2010, 25(5): 379-385.
2010, Vol. 25 
