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Fig. 27. Changes in (A) GSI (%), (B) sGnRH contents (pg) in the telencephalon including POA, (C) sGnRH contents (pg) in the hypothalamus, (D) sGnRH contents (pg) in the pituitary, and (E) pituitary FSHβ contents (ng) during gonadal maturation of male sockeye salmon reared under short and long photoperiods (mean ± SEM). In each group, means with differing letters differ significantly (P < 0.05). **(P < 0.01) and *(P < 0.05) indicate statistical significance between the groups. Reprinted with permission from Fisheries Science, 63, Amano et al., Incomplete development of the brain–pituitary–gonadal axis may underlie the delay in the initiation of precocious maturation in male sockeye salmon, 873–876, Figs. 2–4, © 1997, the Japanesel Society of Fisheries Science.

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