Institute of Coastal Research, Swedish Board of Fisheries, Oregrund, Sweden.
J Fish Biol. 2010 Feb;76(3):622-40. doi: 10.1111/j.1095-8649.2009.02520.x.
Four Atlantic salmon Salmo salar stocks in the Baltic Sea, varying in their breeding history, were studied for changes in life-history traits over the years 1972-1995. Total length (L(T)) at age of captured (L(TC)) fish had increased throughout the study period, partly due to increased temperature and increased L(T) at release, (L(TR)) but also due to remaining cohort effects that could represent unaccounted environmental or genetic change. Simultaneously, maturation probabilities controlled for water temperature, L(TC) and L(TR) had increased in all stocks. The least change was observed in the River Tornionjoki S. salar that was subject only to supportive stockings originating from wild parents. These results suggest a long-term divergence between semi-natural and broodstock-based S. salar stocks. Increased L(T) at age explained advanced maturation only marginally, and it remains an open question to what extent the generally increased probabilities to mature at early age reflected underlying genetic changes.
对波罗的海中四个具有不同繁殖历史的大西洋鲑 Salmo salar 群体进行了研究，以了解 1972 年至 1995 年间其生活史特征的变化。被捕鱼的全长（L(TC)）在整个研究期间有所增加，部分原因是温度升高和释放时的全长（L(TR)）增加，但也由于剩余的群体效应，这可能代表未被解释的环境或遗传变化。同时，所有种群的成熟概率都控制在水温、L(TC)和 L(TR)的基础上有所增加。在仅接受来自野生亲本的支持性放养的 River Tornionjoki S. salar 中观察到的变化最小。这些结果表明，半自然和基于亲鱼的 S. salar 群体之间存在长期的分歧。年龄的增加只能略微解释成熟度的提高，并且一个悬而未决的问题是，在多大程度上普遍增加的早期成熟概率反映了潜在的遗传变化。
