Premium
Blood electrolyte and prolactin regulation in rainbow trout, Oncorhynchus mykiss (Walbaum), exposed to nitrite
Author(s) -
WILLIAMS E. M.,
EDDY F. B.
Publication year - 1992
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1992.tb00777.x
Subject(s) - rainbow trout , nitrite , sulpiride , prolactin , biology , endocrinology , medicine , chloride , dopamine , hormone , chemistry , fish <actinopterygii> , fishery , nitrate , ecology , dopaminergic , organic chemistry
. Rainbow trout, Oncorhynchus mykiss (Walbaum), exposed to environmental nitrite for 3h showed significantly reduced chloride concentrations from 120·9 ± 0·5 to 113·8 ± 2‐4 mmol/1, the result of nitrite uptake by the gills with a compensatory loss of blood chloride. This change could be prevented by injection of 10 mg/kg sulpiride, which stimulates prolactin secretion through antagonism of dopamine D 2 receptors, thus increasing circulating prolactin levels. Prolactin is known to decrease membrane permeability and the increased levels of the hormone probably account for the relatively unchanged (compared to controls) plasma chloride and potassium levels in nitrite‐exposed, sulpiride‐treated fish.