不同地理来源草鱼群体杂交后代的生长性能分析

Growth Performance of Hybrid Progeny from Different Geographical Ctenopharyngodon idella

为评估10个不同地理来源草鱼群体（佛山群体、肇庆群体、荆州群体1、荆州群体2、荆州群体3、鄂州群体、益阳群体、长沙群体1、长沙群体2和江苏群体）杂交后代的生长性能,对该10个群体为亲本构建的15个杂交组合进行同塘生长对比。对其4月龄、7月龄、8月龄、10月龄、12月龄、15月龄和18月龄的体质量进行测量。以4月龄体质量为协变量,运用协方差分析对不同杂交组合后代进行生长性能分析。结果显示,在18月龄时荆州群体2♀×佛山群体♂杂交组合后代平均体质量最高,为1892.90 g,比其他杂交组合平均体质量分别高3.51%~32.36%。经多重比较分析结果显示,荆州群体2♀×佛山群体♂和荆州群体1♀×佛山群体♂杂交组合后代的体质量显著高于其他杂交组合（P〈0.05）。生产上,应用这2个具有生长优势的组合生产优质苗种进行推广,可大幅度提高渔民的经济效益,另外该结果可为快速生长草鱼核心群体的确定奠定基础。

To assess growth performance of hybrid progeny of grass carps from ten different geographicalorigins（Foshan population, Zhaoqing population, Jingzhou population 1, Jingzhou population 2, Jingzhoupopulation 3, Ezhou population, Yiyang population, Changsha population 1, Changsha population 2 andJiangsu population）, fifteen hybrid combinations were constructed and cultured in the same pond. Body masswas measured at the age of 4, 7, 8, 10, 12, 15 and 18 months. Using body mass at the age of 4 months ascovariant, growth performance of hybrid progeny was analyzed by covariance analysis. The results showed thatthe average body mass of Jingzhou population 2♀×Foshan population♂ was 1892.90 g at the age of 18 monthsand was 3.51%~32.36% higher than that of other hybrid progeny. Multiple comparison analysis showed thataverage body mass of hybrid progeny of Jingzhou population 2 ♀ × Foshan population ♂ and Jingzhoupopulation 1♀× Foshan population♂ were significantly higher than that of other hybrid progeny（P0.05）.Jingzhou population 2♀× Foshan population♂ and Jingzhou population 1♀×Foshan population♂ were the optimized choice to produce high quality fry. The results will lay foundation for seeking Ctenopharyngodon idella populations who have rapid growth.