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Fig. 1. Schematic drawing that illustrates the diversity of distance covered by non-migratory and migratory forms for four salmonid genera (shown in the order of the evolutional age). In genus Hucho, most fish live continuously in their natal rivers. In genus Salvelinus and Salmo, some fish migrate to the sea after smoltification. In genus Oncorhynchus, most juveniles perform long distance seaward migration for several years. On the other hand, in masu salmon (O. masou), a portion of the fish perform seaward migration for a year after smoltification, while an equivalent portion of them stay in the rivers similar to genera Hucho, Salvelinus, and Salmo.

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