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Endocrine control of osmoregulation in teleost fish

American Zoologist

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Abstract

SYNOPSIS. As the primary link between environmental change and physiological response, the neuroendocrinesystem is a critical part of osmoregulatory adaptations. Cortisol has been viewpd as 'the' seawater-adapting hormone in fish and prolactin as 'the' fresh water adapting hormone. Recent evidence indicates that the growth hormone/insulin-like growth factor I axis is also important in seawater adaptation in several teleosts of widely differing evolutionary lineages. In salmonids, growth hormone acts in synergy with cortisol to increase seawater tolerance, at least partly through the upregulation of gill cortisol receptors. Cortisol under some conditions may promote ion uptake and interacts with prolactin during acclimation to fresh water. The osmoregulatory actions of growth hormone and prolactin are antagonistic. In some species, thyroid hormones support the action of growth hormone and cortisol in promoting seawater acclimation. Although a broad generalization that holds for all teleosts is unlikely, our current understanding indicates that growth hormone promotes acclimation to seawater, prolactin promotes acclimation to fresh water, and cortisol interacts with both of these hormones thus having a dual osmoregulatory function.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Endocrine control of osmoregulation in teleost fish
Series title:
American Zoologist
Volume
41
Issue:
4
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
American Zoologist
First page:
781
Last page:
794