Migratory Lifestyle (IMAGE)
Caption
Four-year old migratory brown trout (Salmo trutta) caught in the Redon river close to Lake Geneva. This migrant individual has gone through a complex morphological, physiological, and behavioral transformation called smoltification, which has led to a drastically different phenotype when compared to the genetically related but sedentary individual shown on Figure 2. The co-occurrence of sedentary and migratory life-history types is a common feature in several salmonid fish species. The migrant fish grow much bigger as an adaptation for long distance migration, and they spend most of their life in freshwater lakes or in the sea, but migrate back to their natal stream during the reproduction season.
Credit
Thomas Giger et al.
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