Abstract
Trophic niche similarity among sea trout Salmo trutta in central Norway investigated using different time-integrated trophic tracers
Highlights
Anadromous brown trout Salmo trutta L., often termed sea trout, are widely distributed in the coastal waters of Europe (Elliott 1994, Klemetsen et al 2003)
It has been hypothesised that declines are related to decreased sea survival caused by changes in food supply or increasing infection by the ectoparasitic salmon lice Lepeophtheirus salmonis Krøyer, 1838 (ICES 2013, Thorstad et al 2015)
The samples from the Rauma River had the largest mean LT and mass (599 mm, 2292 g), while S. trutta with the smallest mean LT and mass were from the Drevja River (313 mm, 364 g)
Summary
Anadromous brown trout Salmo trutta L., often termed sea trout, are widely distributed in the coastal waters of Europe (Elliott 1994, Klemetsen et al 2003). Outside of the natural area for the species (e.g. New Zealand, Kerguelen Islands and Canada), anadromy is observed in introduced S. trutta (Elliott 1994, Lecomte et al 2013). During the last several decades, the abundance of S. trutta has declined markedly in many regions (ICES 2013). Recent findings from several other countries (e.g. England, Ireland and Sweden; ICES 2013) indicate similar declines. It has been hypothesised that declines are related to decreased sea survival caused by changes in food supply or increasing infection by the ectoparasitic salmon lice Lepeophtheirus salmonis Krøyer, 1838 (ICES 2013, Thorstad et al 2015)
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