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通过测定美国奥利亚罗非鱼(Ao)、Ao(♀)×鳜(♂)的子代(As1)、埃及奥利亚罗非鱼(Eo)、Eo(♀)×鳜(♂)的子代(Es1)、As1(♀)×Ao(♂)的所谓“回交”子代(As2)、Es1的兄妹交子代(Es2)的形态和框架数据,用卡方分析、聚类分析、判别分析,比较了它们之间的形态异同。可数性状卡方分析表明,这几组实验鱼可数性状无显著差异;形态和框架数据的聚类分析结果表明,除了As2与Ao之间无显著差异外,其它都有显著差异,其中As1和Es1与其它鱼的差异最大,Es2与其它鱼的差异其次;判别分析结果表明,判别效果极显著,判别准确率都在90%以上,判别准确率依次为Es1、As1、As2都为100%,Es2为96.2%,Ao为95%,Eo为90%。综合以上分析,根据亚种75%规则,表明雌性奥利亚罗非鱼与雄性鳜间远缘杂交后代与亲本奥利亚罗非鱼不同;为此通过本课题的远缘杂交也许能产生新的养殖品种。
The genetic diversity of O. tilapia (Ao), the progeny of Ao (♀) × ♂ (As1), the population of Eo (o) × 鳜 (♂) Morphology and framework data of the so-called “backcross” (As2), Es2 siblings (Es2) of Es1, As1 (A) × Ao (♂) Class analysis, discriminant analysis, comparing the similarities and differences between them. Countable trait chi-square analysis showed that there was no significant difference in the countable traits of these groups of experimental fish. The cluster analysis of morphological and framework data showed that there were significant differences except As2 and Ao, among which As1 The difference between Es2 and other fish was the second. The discriminant analysis showed that the discriminant effect was very significant and the discriminant accuracy was over 90%. The discriminant accuracy was Es1, As1 and As2 were all 100% , Es2 96.2%, Ao 95%, Eo 90%. Based on the above analysis, according to the subspecies rule of 75%, indicating that female Oreochromis spp. And males are distant hybrid progeny and their parents Oreochromis different; for this topic by distant hybridization may produce new Of breed.