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Fig. 9. (a) Frequency of migrants and non-migrants, plasma levels of (b) testosterone (T), (c) thyroxine (T4), and (d) triiodothyronine (T3) in control and T 500 μg-treated 1+ masu salmon smolts. Numbers above columns in (a) indicate the number of migrants and non-migrants. Differences in mean plasma hormone levels among experimental groups were analyzed by one-way analysis of variance (ANOVA) followed by Fisher's PLSD. * indicates a significant difference at P < 0.05 from migrants. Reprinted with permission from Zoological Science, 17, Munakata et al., Inhibitory effects of testosterone on downstream migratory behavior in masu salmon, Oncorhynchus masou, 863–870, Fig. 3, © 2000b, Zoological Society of Japan.

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