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Contemporary ocean warming and freshwater conditions contribute to delay the completion of maturation in Atlantic salmon

Otero, Jaime; Jensen, Arne J.; L’Abée-Lund, Jan Henning; Stenseth, Nils Christian; Storvik, Geir; Vøllestad, Leif Asbjørn
Working paper
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S1310.pdf (1.773Mb)
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http://hdl.handle.net/11250/102590
Utgivelsesdato
2010
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  • ICES CM documents authored by IMR scientists (1949-2011) [3139]
Originalversjon
This report is not to be quoted without prior consultation with the General Secretary.  
Sammendrag
The completion of maturation in Atlantic salmon (Salmo salar) depends on

environmental conditions that affect both feeding opportunities and growth, which

would provide sufficient lipid stores for reproduction. However, if the level of energy

reserves of a given fish is below a certain genetic threshold at a critical decision time

further gonadal development is arrested and fully maturation postponed. This individual

development pattern suggests that the proportion of fish maturing at a given sea age

could vary from year to year according to the feeding opportunities in the oceanic

migratory habitat, and the growth rate during freshwater residence that might be

associated with growth at sea. In this study we show that sea age at maturity of adults

caught in multiple Norwegian rivers has increased with increasing sea surface

temperature (SST) experienced by the fish in autumn months during their first year at

sea. Furthermore, freshwater conditions measured by river discharge during summer

months one year ahead of seaward migration is positively related with increasing sea

age at maturity. This result is discussed within the broad changes occurring in the

North-east Atlantic pelagic food web mostly related with the current ocean warming,

and river conditions influencing growth rates.
Utgiver
ICES
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ICES CM documents;2010/S:13

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