斑鳜♀×鳜♂杂交一代胚胎及仔稚鱼发育研究

目的]为鳜鱼种间杂交利用提供基础资料。方法]对斑鳜♀×鳜♂杂交一代胚胎发育与仔稚鱼生长特征进行观察,分析不同杂交方式对杂种一代早期生长发育的影响。结果]杂交F1受精卵卵径为(2.20±0.09)mm,在水温18～25℃下流水孵化,杂交F1经历卵裂期(7 h)、囊胚期(8 h)、原肠期(8 h)、神经胚期(4 h)、器官形成期(40 h),受精后67 h达到半数出膜。杂交F1初孵仔鱼全长为(4.12±0.12)mm,初孵至孵出后43 d全长日均增长率为1.03 mm。结论]斑鳜♀×鳜♂杂交F1胚胎发育介于双亲之间,仔、稚鱼生长速度与父本接近。

Study on the Embryonic, Larval and Juvenile Development of Hybrid F1 of Siniperca scherzeri （♀ ） x Siniperca chuatsi （♂）

Objective ] The research aimed to provide basic data for the interspecific hybridization utilization of Siniperca species. Method] The embryonic development and larval,juvenile growth characters of hybrid F1 of Siniperca scherzeri （♀） x S. chuatsi （♂ ）were observed. And the effects of different hybridization methods on the early development of hybrid FI were analyzed. Result] The diameter of fertilized egg of hybrid F1 was 2.20 ＋ 0.09 mm. Half of fertilized eggs in flowing water at temperature of 18 - 25℃ hatched out ＇after fertilization 67 hours. The whole embryonic development of hybrid F1 underwent the cleavage stage （7 hours）, blastula stage （8 hours）, gastrula stage （8 hours）, neural stage （4 hours） and organogenesis stage （40 hours）. The whole length of newly-hatched larvae of the hybrid Ft was 4.12±0.12 mm and the average daily growth rate was 1.03 mm from 0 to 43 hatching days. Conclusion] The embryonic development of hybrid FI was inter-mediate to their parents and the growth rate of larva and juvenile was similar to that of its paternal fish.