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Table 7. Appearance of frequency and migratory pattern (area) of non-migratory and migratory forms of masu salmon (Oncorhynchus masou) that inhabit streams along Sanriku coast in northern Honshu and its plasma sex steroid hormone levels, gonad somatic index (GSI), and gonadal development and growth stages prior to and during the period of downstream migration, based on Kiso (1995). Shades indicate the potential physiological factors that inhibit or modulate the occurrence of downstream migratory behavior.

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