This study aimed to investigate the morphological characteristics of Percocypris pingi pingi （Tchang） at the embryonic and postembryonic developmental periods and to demonstrate the early developmental stage of P. p...This study aimed to investigate the morphological characteristics of Percocypris pingi pingi （Tchang） at the embryonic and postembryonic developmental periods and to demonstrate the early developmental stage of P. pingi pingi （Tchang）. According to the results, the fully mature eggs were spherical, orange-col- ored, sticky, 2.2 mm in diameter; the maximum outer diameter reached 3.2 -3.8 mm after absorbing water. When water temperature was （18 -＋ 0.5） ~C, the first cleavage occun~ at 2h 28 min post-fertilization; organs began to form at 45 h 23 min post-fertilization; larvae were hatched at 126 h 28 min post-fertilization. Newly hatched larvae exhibited a total length of 10.4 mm, with large and compressed yolk sacs. According to the morphological characteristics, the embryonic de- velopmental process of P. pingi pingi （Tchang） could be divided into seven continuous stages, including fertilized egg stage, cleavage stage, blastula stage, early gastrula stage, neurala stage, organ formation stage and hatching stage, which were further divided into 32 phases. When water temperature ranged from 18.8 ~C to 25.0 ~C, the whole developmental process of P. pingi pingi （Tchang） from larvae to juveniles lasted 93 d. According to the morphological and ecological charac- teristics, the pestembryonic developmental process of P. pingi pingi （Tchang） could be divided into three stages, including yolk-sac larva stage, late larva stage and junenile stage. This study laid solid foundation for .展开更多
基金Supported by Special Fund for Scientific Research in the Public Interest from the Ministry of Agriculture"Protection and Utilization of Fish Resources in the Middle Reach of Brahmaputra River"(201403012)Youth Fund for Breeding Project from Sichuan Department of Finance(2009QNJJ-022)
文摘This study aimed to investigate the morphological characteristics of Percocypris pingi pingi （Tchang） at the embryonic and postembryonic developmental periods and to demonstrate the early developmental stage of P. pingi pingi （Tchang）. According to the results, the fully mature eggs were spherical, orange-col- ored, sticky, 2.2 mm in diameter; the maximum outer diameter reached 3.2 -3.8 mm after absorbing water. When water temperature was （18 -＋ 0.5） ~C, the first cleavage occun~ at 2h 28 min post-fertilization; organs began to form at 45 h 23 min post-fertilization; larvae were hatched at 126 h 28 min post-fertilization. Newly hatched larvae exhibited a total length of 10.4 mm, with large and compressed yolk sacs. According to the morphological characteristics, the embryonic de- velopmental process of P. pingi pingi （Tchang） could be divided into seven continuous stages, including fertilized egg stage, cleavage stage, blastula stage, early gastrula stage, neurala stage, organ formation stage and hatching stage, which were further divided into 32 phases. When water temperature ranged from 18.8 ~C to 25.0 ~C, the whole developmental process of P. pingi pingi （Tchang） from larvae to juveniles lasted 93 d. According to the morphological and ecological charac- teristics, the pestembryonic developmental process of P. pingi pingi （Tchang） could be divided into three stages, including yolk-sac larva stage, late larva stage and junenile stage. This study laid solid foundation for .
