Effects of spectral composition, photoperiod and light intensity on the gonadal development of Atlantic salmon Salmo salar in recirculating aquaculture systems (RAS)

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 stud...

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Bibliographic Details
Published in:Chinese journal of oceanology and limnology 2015-01, Vol.33 (1), p.45-56
Main Authors: Qiu, Denggao, Xu, Shihong, Song, Changbin, Chi, Liang, Li, Xian, Sun, Guoxiang, Liu, Baoliang, Liu, Ying
Format: Article
Language:English
Subjects:
Aquaculture
Aquaculture techniques
Biology
Carnivorous animals
Composition
Condition factor
Earth and Environmental Science
Earth Sciences
Females
Freshwater fishes
Gonadosomatic index
Growth rate
Light intensity
Lighting
Luminous intensity
Males
Marine
Marine biology
Marine fishes
Melatonin
Oceanography
photoperiod
Photoperiods
Polyculture (aquaculture)
Recirculating aquaculture systems
Salmo salar
Salmon
Secretion
Sex
sex hormones
Sexual maturity
specific growth rate
Spectral composition
Steroid hormones
Steroids
Survival
survival rate
weight gain
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Summary: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 (P0.05). 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.
ISSN:0254-4059
2096-5508
1993-5005
2523-3521
DOI:10.1007/s00343-015-4011-3