翘嘴鳜♀×斑鳜♂杂交子一代早期生长速度

Analysis of early-stage growth rate of the hybrid F_1 of Siniperca chuatsi ♀× S. scherzeri ♂

对翘嘴鳜♀×斑鳜♂(Siniperca chuatsi♀×S.scherzeri♂)杂交子一代和翘嘴鳜在0.3月龄、2月龄、7月龄和11月龄时的体重、体长和体高进行测量,从变异系数、杂种优势率、相对/绝对生长率、体重与体长的幂函数曲线以及肥满度5方面,对杂交子一代和母本翘嘴鳜的生长速度和杂种优势进行对比分析。结果显示,7月龄时杂交子一代的体重(300.4 g±118.2 g)与翘嘴鳜(305.2 g±82.5 g)差异不显著,且在7月龄时体重、体长和体高的月相对生长率(280.13%,25.30%和27.55%)比翘嘴鳜显著增高(89.62%,15.90%和12.72%);在0.3月龄和11月龄时体长的超亲杂种优势率分别为2.48%和0.91%;11月龄时杂交子一代的体重(540.88 g±173.66 g)显著低于与翘嘴鳜(624.45 g±154.11g)(P<0.05);杂交子一代和翘嘴鳜体重与体长关系幂函数生长方程的决定性指数R2(0.992和0.995)、条件因子a(0.059和0.058)和异速生长因子b(2.722和2.740)在数值上非常接近。结论认为,尽管在总体生长速度上翘嘴鳜♀×斑鳜♂杂交子一代较母本翘嘴鳜略慢,但其早期的生长趋势与翘嘴鳜相似,并在体重与体长的生长关系方面具有良好的一致性。杂交子一代遗传了母本翘嘴鳜的快速生长性能,并在体长性状上显现出一定的超亲杂种优势。本研究通过分析养殖翘嘴鳜♀×斑鳜♂杂交子一代的生长速度,探讨杂交子一代的早期生长趋势及其杂种优势,旨在为杂交子一代的规模化人工养殖和品种选育等提供参考数据。

Based on the measured data of three important economic traits （body weight, body length and body height） of the hybrids F1 ofSiniperca chuatsi♀×S. scherzeri♂ and Siniperca chuatsi individuals at the ages of 0.3 months, 2 months, 7 months and 11 months, the growth rate and heterosis of the hybrids F1 were analyzed and compared withSiniperca chuatsi, using the performance metrics of coefficient of variation, high-parent heterosis, relative and absolute growth rate, relationship curve of body weight and body height, and relative fatness. At age of 7 months, the mean body weight of the hybrids F1 （300.4 g±118.2 g） was not significantly different withS. chuatsi（305.2 g±82.5 g）, while the mean monthly relative growth rate of body weight, body length and body height （280.13%, 25.30% and 27.55% ） of the hybrids F1 were higher than that ofS. chuatsi（89.62%, 15.90% and 12.72%）. The high-parent heterosis of the hybrids F1 for body length at age of 0.3 months and 11 months was 2.48% and 0.91%, respectively. All growth rate curves of the hybrids F1 were similar with their female parentS. chuatsi. However, the mean body weight of the hybrids F1 （540.88 g±173.66 g） was significantly lower thanS. chuatsi（624.45 g±154.11 g） at age of 11 months. The coefficient of determination （0.992 and 0.995）, condition factor （0.059 and 0.058） and allometric growth factor （2.722 and 2.740） for relationship curve of body weight and body height of the hybrids F1andSiniperca chuatsiwere almost identical. These results indicated that the primary growth trend of the hybrids F1was similar toS. chuatsi, the relationship curve of body weight and body height of the hybrids F1 was consistent with that ofS. chuatsi, even though their overall growth rate was slightly slower than S. chuatsi.The hybrids F1 successfully inherited the fast growth trait from their female parentS. chuatsi, with some high-parent heterosis in body length.