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Plasma Ca2+ concentration limits melatonin night production in two fish species

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In freshwater (FW) rainbow trout Oncorhynchus mykiss of spontaneously low plasma calcium concentrations ([Ca2+]pl), plasma melatonin at night was significantly lower than that measured in FW fish with the highest [Ca2+]pl. In brackish water adapted rainbow trout with originally high [Ca2+]pl, plasma melatonin concentration at night was elevated. In cannulated flounder Platichthys flesus, night plasma melatonin increases (ΔMel) corresponded to [Ca2+]pl. It is postulated that in physiological steady-state conditions, melatonin synthesis capacity is coupled to free calcium concentration in plasma of O. mykiss and P. flesus.
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Keywords: Oncorhynchus mykiss; Platichthys flesus; flounder; melatonin; plasma Ca2+; rainbow trout

Document Type: Regular Paper

Affiliations: Institute of Oceanology of Polish Academy of Sciences, Department of Marine Genetics and Biotechnology, św. Wojciecha 5 Str., 81-347 Gdynia, Poland

Publication date: 2003-06-01

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