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Fig. 6. (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-treated 1+ masu salmon smolts. Numbers above columns in (a) indicate the number of migrants and non-migrants. Differences in the frequency of downstream behavior from the control group were analyzed by the χ2-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 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. 1, © 2000b, Zoological Society of Japan.

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