Moav R, Wohlfarth G
Genetics. 1976 Jan;82(1):83-101. doi: 10.1093/genetics/82.1.83.
The domesticated European carp was subjected to a two-way selection for growth rate. Five generations of mall selection for faster growth rate did not yield any response, but subsequent selection between groups (families) resulted in considerable progress while maintaining a large genetic variance. Selection for slow growth rate yielded relatively strong response for the first three generations. Random-bred control lines suffered from strong inbreeding depression and when two lines were crossed, the F1 showed a high degree of heterosis. Selection was performed on pond-raised fish, but growth rate was also tested in cages. A strong pond-cage genetic interaction was found. A theoretical explanation was suggested involving overdominance for fast growth rate and amplification through competition of intra-group but not inter-group variation.
对养殖的欧洲鲤鱼进行了生长速率的双向选择。连续五代选择生长速率更快的个体未产生任何反应,但随后在群体(家系)间进行选择则取得了显著进展,同时保持了较大的遗传方差。选择生长速率较慢的个体在前三代产生了相对较强的反应。随机繁殖的对照品系遭受了严重的近亲衰退,当两个品系杂交时,F1代表现出高度杂种优势。选择是在池塘养殖的鱼上进行的,但生长速率也在网箱中进行了测试。发现了强烈的池塘-网箱遗传互作。有人提出了一种理论解释,涉及快速生长速率的超显性以及通过组内而非组间变异的竞争进行放大。