杂色鲍繁殖亲本体型小型化原因初探

A preliminary study on the minimizations of small abalone,Haliotis diversicolor

针对目前杂色鲍性腺发育提前的现象展开研究,以产卵量为指标分析了杂色鲍可量性状与产卵量之间的相关关系.结果表明,以体长的立方除以体重作为体型系数(F),它与产卵量(G)之间存在着显著的负相关(p<0.05),相关系数为-0.9480.曲线回归方程为:G=-7.5009 ln(F)+18.22(R2=0.9095).进一步的分析结果表明,杂色鲍雌性亲本的产卵量和体长亦呈负相关,相关系数为-0.7182.结果提示,性腺发育较早的小个体的杂色鲍母本更多地参与了繁殖活动,而且产出的卵子的绝对重量大于大个体的杂色鲍亲鲍.这可能是造成人工育种中杂色鲍体型减小、性腺发育提前的潜在原因.

This study is to find out the cause of the minimization of small abalone. We used egg numbers as an index of breeding quality. The relations between the length, weight, egg numbers and body size were studied. The result of single factorial correlation analysis shows that the body size of small abalone positively correlated with egg numbers （p 〈0.05）. Regression equation can be set as G = -7. 500 91n（F） ＋ 18.22 （R^2 =0. 909 5）. The result shows that smaller abalone ,which matured earlier ,takes an active part in the breeding activity. They contribute more germ plasm on the offspring than that of larger and lighter ones. This might be one of important reasons for the minimization of small adult abalone during artificial breeding.