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Fig. 23. Frequency of migrants and non-migrants, plasma levels of oGH and cortisol in the control, oGH 250 μg, cortisol 2 mg, and oGH 250 μg + cortisol 2 mg-treated 0+ masu salmon parr. Figures beside columns indicate the number of migrants and non-migrants. Differences in the frequency of downstream swimming 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 < 0.001 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. Differing letters represent significant differences at P < 0.05 among all groups. Reprinted from General and Comparative Endocrinology, 150, Munakata et al., Effects of growth hormone and cortisol on the downstream migratory behavior in masu salmon, Oncorhynchus masou, 12–17, © 2007, with permission from Elsevier.

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