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Title: Osmoregulatory adaptations of freshwater air-breathing snakehead fish (Channa striata) after exposure to brackish water
Authors: La iad Nakkrasae
Khanitha Wisetdee
Narattaphol Charoenphandhu
Khon Kaen University
Mahidol University
Keywords: Agricultural and Biological Sciences;Biochemistry, Genetics and Molecular Biology
Issue Date: 17-Jul-2015
Citation: Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology. Vol.185, No.5 (2015), 527-537
Abstract: © 2015, Springer-Verlag Berlin Heidelberg. NaCl-rich rock salt dissolved in natural water source leads to salinity fluctuation that profoundly affects freshwater ecosystem and aquatic fauna. The snakehead (Channa striata) can live in saline water, but the osmoregulatory mechanisms underlying this ability remain unclear. Herein, we found that exposure to salinities ≥10 ‰ NaCl markedly elevated plasma cortisol and glucose levels, and caused muscle dehydration. In a study of time-dependent response after being transferred from fresh water (0 ‰ NaCl, FW) to salt-dissolved brackish water (10 ‰ NaCl, SW), FW–SW, cortisol increased rapidly along with elevations of plasma glucose and lactate. Interestingly, plasma cortisol returned to baseline after prolonged exposure, followed by a second peak that probably enhanced the branchial Na+/K+-ATPase activity. Under SW–FW condition, Na+/K+-ATPase activity was not altered as compared to SW-adapted fish. In conclusion, salinity change, especially FW–SW, induced a stress response and hence cortisol release in C. striata, which might increase plasma glucose and lactate to energize the branchial Na+/K+-ATPase.
ISSN: 01741578
Appears in Collections:Scopus 2011-2015

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