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Fig. 4. Changes in body length (BL), body weight (BW), condition factor (CF), gonad somatic index (GSI), plasma levels of testosterone (T), 11-ketotestosterone (11-KT), estradiol-17β (E2), progesterone (P), 17α-progesterone (17α-P), 17,20β-dihydroxy-4-pregnene-3-one (DHP), and pituitary hormone luteinizing hormone (LH) in male and female masu salmon. Differences in mean plasma hormone levels among experimental groups were analyzed by one-way analysis of variance (ANOVA) followed by Scheffe's F-test. * and *** indicates significant difference at P < 0.05 and P < 0.001, respectively. Reprinted from Comp. Biochem. Physiol. Part B, 129, Munakata et al., The involvement of sex steroid hormones in downstream and upstream migratory behavior of masu salmon, 661–669, © 2001a, with permission from Elsevier.

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