Study of Embryonic and Postembryonic Development of the Hybrid （ Ctenopharyngodon idellus ♀ × Elopichthysbambusa♂ ）
摘要
[Objective] The purpose was to provide a reference for crossbreeding of grass carp. [Method]We conducted hybridization between Ctenopharyngodon idellus( ♀) and Elopichthys bambusa(♂) by artificial methods. The process of embryo and postembryonic development were observed and recorded. [Result]The fertilization rate,hatching rate and survival rate of the hybrid F1were( 75. 8 ± 6. 2) %,( 41. 9 ± 8. 2) % and( 9. 3 ± 3. 7) %,respectively. At the water temperature of 20. 1- 21. 6℃,the larvae was hatched for about 34 h and 25 min after fertilization. The whole length of newly-hatched larvae of the hybrid F1was( 5. 8 ± 0. 12) mm. The larvae could feed rotifer and unicellular algae after 3 or 4 days hatching. Postembryonic development of the hybrid at the formation of scales,lasted for 65 days when the young was( 74. 0 ± 2. 1) mm in whole length. [Conclusion]The embryonic development of hybrid F1 was intermediate to their parents,the form of the hybrid F1 was similar to that of their female line of grass carp. The growth rate of larva was faster than that of grass carp and similar to that of their paternal fish.