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Fig. 16. (a) Frequency of migrants and non-migrants, plasma levels of (b) testosterone (T), (c) pituitary contents of luteinizing hormone (LH), (d) plasma levels of LH, (e) thyroxine (T4), and (f) triiodothyronine (T3) in control and T 500 μg/fish-treated 1+ immature masu salmon. Numbers above columns in (a) indicate the number of migrants and non-migrants. N.S. represents no sample. Differences in the frequency of upstream swimming behavior from the control group were analyzed by the Fisher's exact probability test, using StatView version 4.5 software (Abacus Concepts, Inc., California, USA). ** indicates a significant difference at P < 0.01 from the control group. Differences in mean plasma and pituitary hormone levels among experimental groups were analyzed by one-way analysis of variance (ANOVA) followed by Fisher's PLSD. Differing letters represent significant differences at P < 0.05 among all groups. 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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