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Plasma Ca 2+ concentration limits melatonin night production in two fish species
Author(s) -
Gozdowska M.,
Sokołowska E.,
Kulczykowska E.
Publication year - 2003
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1046/j.1095-8649.2003.00126.x
Subject(s) - melatonin , rainbow trout , biology , platichthys , flounder , calcium , trout , zoology , fishery , salmonidae , medicine , endocrinology , fish <actinopterygii>
In freshwater (FW) rainbow trout Oncorhynchus mykiss of spontaneously low plasma calcium concentrations ([Ca 2+ ] pl ), plasma melatonin at night was significantly lower than that measured in FW fish with the highest [Ca 2+ ] pl . In brackish water adapted rainbow trout with originally high [Ca 2+ ] pl , plasma melatonin concentration at night was elevated. In cannulated flounder Platichthys flesus , night plasma melatonin increases (ΔMel) corresponded to [Ca 2+ ] 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 .