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Differential effects of light intensity on growth, maturation and plasma melatonin in Atlantic salmon and its importance in aquaculture
Porter, M.J.R.; Duncan, N.J.; Roed, A.J.; Oppedal, F.; Taranger, G.L.; Bromage, N.R. (2000). Differential effects of light intensity on growth, maturation and plasma melatonin in Atlantic salmon and its importance in aquaculture, in: Norberg, B. et al. (Ed.) Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. pp. 321-324
In: Norberg, B. et al. (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. International Symposium on the Reproductive Physiology of Fish, 6. Department of Fisheries and Marine Biology, University of Bergen: Bergen. ISBN 82-7461-048-2. 499 pp., meer
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales. , meer
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  • Porter, M.J.R.
  • Duncan, N.J.
  • Roed, A.J.
  • Oppedal, F.
  • Taranger, G.L.
  • Bromage, N.R.
Abstract
    Using measurements of plasma melatonin to assess how photoperiod is perceived by fish, a study was made of the mechanisms by which additional night-time illumination in sea cages reduces early maturation and increases growth in farmed Atlantic salmon. Grilse maturation in salmon maintained on constant light (LL) from November to July was reduced from 63% to 6% and growth was increased by 30%. A reduction in dark phase plasma melatonin levels from 600.0 plus or minus 53.0 pg/ml to 303.1 plus or minus 6.3 pg/ml was also observed and it is suggested that a reduction in the amplitude of dark phase plasma melatonin below a putative threshold level mediates the effect of the additional lights on the reproductive axis.
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