Marine Scotland - Science, Freshwater Laboratory, Faskally, Pitlochry, Scotland, PH16 5LB, UK.
J Fish Biol. 2009 Dec;75(10):2820-31. doi: 10.1111/j.1095-8649.2009.02497.x.
Variation in egg size, hatch timing and size at hatch, and their influence on individual growth rates of Atlantic salmon Salmo salar alevins up to first feeding were examined in pure strain and hybrid crosses of fish from Scotland and Canada. At the intra-female, intra-cross type and inter-cross type levels, specific growth rates prior to first feed were strongly size dependent, with smaller and later hatching alevins growing significantly faster. The magnitude of this size-dependent growth was greatest in the hybrid crosses. This resulted in a 40% reduction in the coefficient of variation (c.v.) in alevin size from post-hatch to first feeding at the intra-female level, and a reduction of both intra- and inter-cross differences in alevin sizes in the same period.
在苏格兰和加拿大的纯种和杂交鱼中，研究了卵大小、孵化时间和孵化时大小的变化及其对大西洋鲑鱼幼鱼至首次摄食的个体生长率的影响。在雌性内、交叉内和交叉间水平上，首次摄食前的特定生长率与体型强烈相关，体型较小且孵化较晚的幼鱼生长速度显著更快。这种体型相关生长的幅度在杂交鱼中最大。这导致在雌性内水平上，从孵化后到首次摄食时幼鱼大小的变异系数（CV）降低了 40%，并且在同一时期内，幼鱼大小的内交叉和外交叉差异都降低了。
