Prolonged air-breathing and recovery modify the thyroid and interrenal axes in climbing perch (Anabas testudineus)
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SourceComparative Biochemistry and Physiology A-Molecular & Integrative Physiology, 146A, 4 Supplement 1, (2007), pp. S95-95
Article / Letter to editor
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Animal Ecology & Ecophysiology
Comparative Biochemistry and Physiology A-Molecular & Integrative Physiology
iss. 4 Supplement 1
SubjectAnimal Ecology and Eco Physiology
To examine the response of thyroid and intrenal axes to hydromineral and metabolic responses in air-breathing fish during their territorial migration, we quantified several physiological markers in the tropical obligate air-breathing perch (Anabas testudineus) during air breathing on land and in water. Plasma T3 and T4 levels remained unaffected after 60 and 120 min of air breathing though T3 had a tendency to increase. Plasma cortisol levels showed a significant 4-fold increase. Plasma cortisol showed a 1.5-fold increase in these recovered fish. Air breathing on land significantly increased plasma glucose (2.8-fold) and plasma urea (5.2-fold) while plasma lactate showed a significant 3.2-fold decrease. Na+,K+-ATPase activity, reflecting the sodium pump activity, showed a 4.4-fold decrease in the gills but produced a 1.8-fold increase in the kidneys after air exposure for 120 min. Significant reversal of the plasma metabolite values and the gill Na+,K+-ATPase activity (15-fold) was obtained during recovery. The immunoreactivity of Na+,K+-ATPase in the branchial chloride cells (CCs) showed little changes. The density of the CCs remained unaffected. A marked increase of the glucocorticoid receptor staining was observed in air-exposed gills. Analyses of the ultrastructure of the branchial epithelia revealed CCs with low Na+, K+-ATPase immunoreactivity, more macrophages and increased intercellular spaces in the air-exposed fish. Our data for the first time provide evidence that the thyroid and interrenals jointly direct adaptive strategies to recover from the stress during prolonged air-breathing thus supporting the hypothesis of a role for thyroid in stress adaptation in fish.
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