plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111 | elSSN : 2287-8815
plSSN : 0374-8111elSSN : 2287-8815
Photoperiod Manipulation Modulates Growth, Somatotropic Axis-RelatedGenes and Hematobiochemical Responses in Atlantic Salmon Salmo salar Parr
박상협·백승훈·홍우석1·김행영1·홍석주1·김창환1·이기쁨1·이유경1·김이경*
국립강릉원주대학교 수산생명의학과, 1강원특별자치도 내수면자원센터 연어연구TF팀
Photoperiod manipulation is commonly practiced in aquaculture to synchronize the photoperiod with the circannual rhythms of Atlantic salmon Salmo salar. Here, the effects of different photoperiod regimes within recirculating aquaculture systems (RAS) on growth, hematological parameters and stress responses in Atlantic salmon parr were determined. Fish (initial weight, 14.1±4.89 g) were reared for 22 weeks under three photoperiod treatments: 12L, 24L and WS. All treatment groups has increased body weight by week 22; however, the rates of weight gain and specific growth did not significantly differ among the treatment groups. Interestingly, the WS group exhibited a significantly greater fork length than the 24L group and showed signs of smoltification. Pituitary growth hormone and hepatic insulin-like growth factor 1 (IGF-1) levels increased in a time-dependent manner. Notably, hepatic IGF-1 expression was significantly higher in the 24L and WS groups than in the 12L group. Additionally, antioxidant gene expression and plasma stress indicators increased temporarily in the 24L and WS groups at week 11. Therefore, although photoperiod manipulation in RAS does not affect overall weight gain, it can modulate growth and smoltification in Atlantic salmon.
Salmo salar, Photoperiods, Growth, IGF-1