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Pineal sensitivity to light of different intensities and spectral quality in salmon and sea bass in vivo and in vitro

Light perception and spectral sensitivity has been extensively studied in salmon and sea bass. This has been accomplished by using in vitro incubations of pineals exposed to different light regimes (photoperiods, intensities, and spectral compositions using narrow bandwidth filters) followed by assessment of melatonin production. In vivo studies have been conduced with different light intensities during the subjective day and night, as well as different spectral compositions of light using narrow bandwidth LED lights in small seawater tanks followed by assessment of the diel profiles of plasma melatonin.

This has been extended with measurements of light transmission of different wavelengths in the skull (through the pineal window) in salmon and sea bass, and resulted in a model for light sensitivity in terms of melatonin production in these two species. This knowledge has been applied to develop and test narrow band-with lamps (green metal halogen and blue LED lamps) in full commercial scale salmon trials in sea cages.

Reported by

UNIVERSITY OF STIRLING
INSTITUTE OF AQUACULTURE
FK9 4LA STIRLING
United Kingdom
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