散鳞镜鲤与兴国红鲤、龙州镜鲤的杂种优势以及鳞被、体色的遗传

HYBRID VIGOUR AND THE INHERITANCE OF SCALE-COVERING AND BODY COLORATION IN CROSS-BREEDINGS BETWEEN CERTAIN VARIETIES OF THE CARP

  • 摘要: 本研究希望通过鲤鱼品种间杂交出现的杂种优势来提高鲤鱼的产量以及在杂种的后代中选择具有优良的经济性状的类型培育出新的鲤鱼品种。两组杂交的杂种一代具有明显的杂种优势,可以直接应用于渔业生产上并可望获得增产效果。根据对鳞被和体色的遗传特性的研究结果断定散鳞镜鲤与兴国红鲤的杂种二代中出现的红色镜鲤的鳞被和体色是由纯合型隐性基因控制的,可以预期它的后代不再出现分离而可能成为一个稳定的新品种。研究了不同品种及其杂种的血清蛋白聚丙烯酰胺盘状电泳图谱,希望借此作为一种选种的工具。

     

    Abstract: Three varieties of carp were chosen as parental stocks for cross breedings:mirrorcarp of the scatter-scaled type (MCS),fully scaled red carp (RC),and the Long-chow mirror carp (LMC).Hybrid offspring (F1) were reared in coexistence withthe inbred offspring at the same stocking rate and in the same pond.By the end ofthe first growing season the average individual weight of the offspring of MCS♂×RC♀ was 50—60% heavier than the inbred RC,and that of MCS♂×LMC♀ was57% heavier than the inbred LMC,meanwhile the survival rate of both hybrids wereas high as the inbred ones.Regarding the inheritance of scale-covering and body coloration,the resultsof our experiment indicate that the scattered scale-covering,and the red coloration aswell,is a recessive character.The second generation (F2) derived from the self-crossof the hybrid (F1) of MCS♂×RC♀ should,theoretically,have 8 genotypes and 4phenotypes.The occurrence of the 4 phenotypes have actually been realized,amongwhich the red mirror carp (scatter-scaled,red coloration) has been a new recombina-tion,distinct from F1 hybrid and from either parent in external appearance.Thescalation pattern and the body coloration of the red mirror carp seem to be theresult of homozygosis of the two recessive genes.Rearing experiment shows that thered mirror carp has a growth rate superior to MCS or RC.It is to be expected thatit should be relatively stable in inheritance and would emerge,as a new,economicvariety of the carp.

     

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