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The Effect and Mechanism of Light on the Growth, Food Intake, and Gonad Development of Atlantic Salmon (Salmo salar) Reared in RAS

2019; Springer Nature; Linguagem: Inglês

10.1007/978-3-319-99211-2_15

2196-4203

Ying Liu, Xiaolong Gao, Liang Chi,

Animal Behavior and Reproduction

Atlantic salmon exhibit seasonal reproduction. However, the mechanisms governing this are still unclear. Generally speaking, kisspeptin has been recognized as a regulator of reproduction. Here, we report a relationship between kisspeptin, GnRH, and photoperiod in Atlantic salmon. The results demonstrated that the expression of the Atlantic salmon kisspeptinreceptor (skissr) was not always consistent with the expression pattern of Atlantic salmon GnRH3 (sGnRH3) during all developmental processes. Kisspeptin may exert its influence primarily in the early and later stages of gonad development by promoting the secretion of sGnRH3. Meanwhile, the expression levels of kissr were higher in fish with gonads at stage II and stage V under the long-day photoperiod regime than under the short-day regime. In addition, both skissr and sGnRH3 were also expressed in the saccus vasculosus (SV), an organ only found in fish. The SV might be a seasonal sensor regulating reproduction in addition to the hypothalamus (Hyp).