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Fig. 25. Changes in (A) GSI (%), (B) the number of neurons expressing sGnRH mRNA in the POA, (C) the number of neurons expressing sGnRH mRNA in the VT, (D) pituitary FSHβ contents (ng/pituitary), and (E) pituitary LHβ contents (ng/pituitary) during gonadal maturation of underyearling male masu salmon reared under short and long photoperiods (mean ± SEM). In each group, means with differing letters differ significantly (P < 0.05). ***(P < 0.001), **(P < 0.01) and *(P < 0.05) indicate statistical significance between the groups. (A)–(C) are reprinted from General and Comparative Endocrinology, 99, Amano et al., Short photoperiod accelerates preoptic and ventral telencephalic salmon GnRH synthesis and precocious maturation in underyearling male masu salmon, 22–27, © 1995, Academic Press, Inc., with permission from Elsevier.

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