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Fig. 13. (a) Frequency of migrants and non-migrants, plasma levels of (b) testosterone (T), (c) thyroxine (T4), and (d) triiodothyronine (T3) in controls, T 50 μg, T 500 μg, and T 1000 μg-treated 1+ immature masu salmon. Numbers above columns in (a) indicate the number of migrants and non-migrants. Differences in the frequency of upstream behavior from the control group were analyzed by the χ2-test, respectively, using StatView version 4.5 software (Abacus Concepts, Inc., California, USA). * indicates significant difference at P < 0.05, from the control group. Differences in mean plasma hormone levels among experimental groups were analyzed by one-way analysis of variance (ANOVA) followed by Fisher's PLSD. Reprinted from General and Comparative Endocrinology, 122, Munakata et al., The effects of testosterone on upstream migratory behavior in masu salmon, Oncorhynchus masou, 329–340, © 2001b, with permission from Elsevier.

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