Osmoregulatory actions of the GH/IGF axis in non-salmonid teleosts

Comparative Biochemistry and Physiology, Part B: Biochemistry and Molecular Biology
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Abstract

Salmonid fishes provided the first findings on the influence of the growth hormone (GH)/insulin-like growth factor I (IGF-I) axis on osmoregulation in teleost fishes. Recent studies on non-salmonid species, however, indicate that this physiological action of the GH/IGF-I axis is not restricted to salmonids or anadromous fishes. GH-producing cells in the pituitary of fish acclimated to different salinities show different degrees of activation depending on the species studied. Plasma GH levels either increase or do not change after transfer of fish from freshwater to seawater. Treatment with GH or IGF-I increases salinity tolerance and/or increases gill Na+,K+-ATPase activity of killifish (Fundulus heteroclitus), tilapia (Oreochromis mossambicus and Oreochromisniloticus) and striped bass (Morone saxatilis). As in salmonids, a positive interaction between GH and cortisol for improving hypoosmoregulatory capacity has been described in tilapia (O. mossambicus). Research on the osmoregulatory role of the GH/IGF-I axis is derived from a small number of teleost species. The study of more species with different osmoregulary patterns will be necessary to fully clarify the osmoregulatory role of GH/IGF-I axis in fish. The available data does suggest, however, that the influence of the GH/IGF-I axis on osmoregulation may be a common feature of euryhalinity in teleosts.

Publication type Article
Publication Subtype Journal Article
Title Osmoregulatory actions of the GH/IGF axis in non-salmonid teleosts
Series title Comparative Biochemistry and Physiology, Part B: Biochemistry and Molecular Biology
DOI 10.1016/S0305-0491(98)10112-8
Volume 121
Issue 1
Year Published 1998
Language English
Publisher Elsevier
Contributing office(s) Leetown Science Center
Description 6 p.
First page 43
Last page 48
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