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DIURNAL EXPRESSION OF CLOCK GENES IN PINEAL GLAND AND BRAIN AND PLASMA LEVELS OF MELATONIN AND CORTISOL IN ATLANTIC SALMON PARR AND SMOLTS
Daily patterns of clock gene activity in the pineal gland and brain, and melatonin and cortisol levels in young and maturing Atlantic salmon
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Abstract
Significant daily variations in clock gene expression were observed in the pineal gland of Atlantic salmon parr under a 12 h:12 h light-dark regime.
- The expression of clock genes Per1-like and Cry2 peaked during the dark phase in parr.
- Clock gene expression was elevated during the light phase in the pineal gland of parr.
- In smolts exposed to continuous light, the daily rhythms of clock gene expression were abolished.
- Plasma levels of melatonin and cortisol also showed significant daily variations in parr under the light-dark regime.
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