Endocrine regulation of skin blanching in red porgy, Pagrus pagrus

TitleEndocrine regulation of skin blanching in red porgy, Pagrus pagrus
Publication TypeJournal Article
Year of Publication2007
AuthorsFanouraki, E, Laitinen JT, Divanach P, Pavlidis M
JournalAnnales Zoologici Fennici
Pages241 - 248

Previous research on red porgy, Pagrus pagrus, has shown that physiological colour change does not depend on changes in plasma cortisol or α-MSH. The purpose of this study was to identify the endocrine mechanism responsible for skin blanching in fish exposed to white background. There was no significant difference in serum cortisol, glucose, lactate, thyroid hormones, or plasma epinephrine concentration between black and white-background-adapted fish. Mean daily plasma melatonin concentration was significantly higher in black- (41.29 ± 2.46 pg ml-1) than white-background-exposed fish (32.07 ± 1.26 pg ml-1) while mean plasma norepinephrine was almost fivefold higher in white- (6.26 ± 1.57 ng ml-1) than in black-background-adapted fish (1.01 ± 0.34 ng ml-1). Skin melanin concentration did not differ significantly between the experimental groups. Our study indicates that skin blanching in red porgy is mediated through norepinephrine release. © Finnish Zoological and Botanical Publishing Board 2007.


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