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QIU Denggao, XU Shihong, SONG Changbin, CHI Liang, LI Xian, SUN Guoxiang, LIU Baoliang, LIU Ying. Effects of spectral composition, photoperiod and light intensity on the gonadal development of Atlantic salmon Salmo salar in recirculating aquaculture systems (RAS)[J]. Journal of Oceanology and Limnology, 2015, 33(1): 45-56 |
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Effects of spectral composition, photoperiod and light intensity on the gonadal development of Atlantic salmon Salmo salar in recirculating aquaculture systems (RAS) |
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| QIU Denggao1,2, XU Shihong1, SONG Changbin3, CHI Liang1, LI Xian1, SUN Guoxiang1,2, LIU Baoliang1, LIU Ying1 |
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1 Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China |
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| Abstract: |
| Artificial lighting regimes have been successfully used to inhibit sexual maturity of Atlantic salmon in confinement. However, when these operations are applied in commercial recirculating aquaculture systems (RAS) using standard lighting technology, sexual maturation is not suppressed. In this study, an L9 (33) orthogonal design was used to determine the effects of three factors (spectral composition, photoperiod, and light intensity) on the gonadal development of Atlantic salmon in RAS. We demonstrated that the photoperiod at the tested levels had a much greater effect on the gonadosomatic index and female Fulton condition factor than spectral composition and light intensity. The photoperiod had a significant effect on the secretion of sex steroids and melatonin (P <0.05), and a short photoperiod delayed sex steroid and melatonin level increases. The three test factors had no significant effects on the survival rate, specific growth rate, relative weight gain, and male Fulton condition factor (P >0.05). The optimum lighting levels in female and male Atlantic salmon were LD 8:16, 455 nm (or 625 nm), 8.60 W/m2 ; and LD 8:16, 8.60 W/m2, 455 nm respectively. These conditions not only delayed gonadal development, but also had no negative effects on Atlantic salmon growth in RAS. These results demonstrate that a combination of spectral composition, photoperiod and light intensity is effective at delaying the gonadal development of both male and female salmon in RAS. |
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| Key words:
Salmo salar|artificial light regimes|gonadal development|recirculating aquaculture systems (RAS)
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| Received: 2014-02-19 Revised: 2014-06-09 |
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