为改良中国的罗氏沼虾种质资源，了解原种罗氏沼虾的杂交后代是否具有一定的杂交优势，以孟加拉引进种群Macrobrachium rosenbergii dacqueti （ Sunier，1925年）和越南引进种群 Macrobrachium rosenbergii rosenbergii （ De Man，1879年）为父母本做正、反杂交，并对杂交组合的繁殖参数进行统计分析；了解了正反杂交母本的怀卵量，受精率，体重相对繁殖力，体长相对繁殖力及受精卵规格。结果表明，正反交各杂交组的各项繁殖参数的平均值组间差异不显著（ P＞0.05），受精卵粒规格达到941.9～976.2粒/g。更大的卵粒会发育成更大的幼体，有助于提高种群的生存能力。%To improve the germplasm resources of Macrobrachium rosenbergii in China , the hybrid offspring of protospecies was studied to understand their heterosis.The species introduced from Bangladesh(M.rosenbergii dacqueti)and Vietnam(M.rosenbergii rosenber-gii) were selected as the parents to conduct positive , reverse hybridization , and the reproductive parameters of hybridized combination were analyzed by statistic .Parameters such as the fecundity , fertilization rate , relative weight fecundity , relative body length fecundity and the fertilized egg size of female parent in the positive , reverse hybridization were studied .The reproductive parameters mean in each positive , reverse cross combinations was not significant in this study ( P>0.05 ) , and the fertilized egg size of the hybrid combina-tions reached to 941.9 -976.2 seeds per gram .The greater eggs could develop into greater larvae which could help to enhance the vi -ability of the population .
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