大菱鲆(Scophthalmus maximus)大规模家系选育优良家系的生长发育规律

GROWTH PATTERNS OF SELECTIVELY BRED TURBOT SCOPHTHALMUS MAXIMUS

运用Logistic、Gompertz和von Bertalanffy3种生长模型分别对大菱鲆的5个优良家系E♂1×E♀2、F♂4×N♀3、F♂2×E♀4、E♂2×F♀1、F♂1×F♀4及对照组群体的生长曲线进行了拟合和比较分析。结果表明,家系E♂1×E♀2、F♂2×E♀4和E♂2×F♀1的最优拟合模型为Gompertz模型,家系F♂4×N♀3和F♂1×F♀4的最优拟合模型为vonBertalanffy模型,而对照组则更适应于Logistic模型拟合其生长曲线。不同月龄家系的瞬时生长率均高于对照组,大多数相对生长率高于对照组,拐点月龄均较对照组拖后,拐点体重均高于对照组,快速生长区间的始速点均比对照组提前,快速生长区间长度均大于对照组。瞬时生长加速率在不同月龄则存在较大变化。

The growth curves of five families and one control group of turbot （Scophthalmus maximus） were fitted using three types of nonlinear growth models （Logistic, Gompertz, von Bertalanffy）. The results showed that the growth curves can be fitted with all three models （R2 0.98）; however, the best model that fitted the growth curve of each family as well as the control group was different. The Gompertz model resulted in the best fit for the families E♂1×E♀2, F♂2×E♀4 and E♂2×F♀1; the von Bertalanffy model fitted the growth curves of the families F♂4×N♀3 and F♂1×F♀4 well; while the Logistic model produced the best fit for the control group. When analyzing the fitting parameters of the best models, we found that the parameters including instantaneous growth rate, growth acceleration rate, relative growth rate, time to reach respective inflection point, body weight at the inflection point, maximum monthly weight gain, and fast-growing period for each of these five families and the control group were all different. Furthermore, all five families all showed higher instantaneous growth rates, delayed inflection points, higher body weights at the inflection point, earlier onset of fast-growing period, longer fast-growing intervals than those of the control group. Finally, almost all relative growth rates of these families were higher than that of the control group; however, growth acceleration rates had large variations among these five families. Our results indicated that the growth patterns of these families and the control group were different.