Divergent trends in life-history traits between Atlantic salmon Salmo salar of wild and hatchery origin in the Baltic Sea

Vainikka, A., Kallio-Nyberg, I., Heino, M. ORCID: https://orcid.org/0000-0003-2928-3940, & Koljonen, M.-L. (2010). Divergent trends in life-history traits between Atlantic salmon Salmo salar of wild and hatchery origin in the Baltic Sea. Journal of Fish Biology 76 (3) 622-640. 10.1111/j.1095-8649.2009.02520.x.

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Anadromous; Fishing-induced evolution; Hatchery; Life history; Maturation reaction norm; Selection
Research Programs:	Evolution and Ecology (EEP)
Depositing User:	IIASA Import
Date Deposited:	15 Jan 2016 08:43
Last Modified:	27 Aug 2021 17:21
URI:	https://pure.iiasa.ac.at/9223

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