Abstract
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.
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Acknowledgments
The authors thank Prof. Nateetip Krishnamra for proofreading of the manuscript, and Dr. Panan Suntornsaratoon for the excellent technical assistance. This work was supported by a grant from the Thailand Research Fund (TRF), the Office of the Higher Education Commission, and Khon Kaen University (MRG5580008 to L. Nakkrasae). N. Charoenphandhu is the TRF Senior Research Scholar (RTA5780001) awarded by Thailand Research Fund and Mahidol University.
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Nakkrasae, Li., Wisetdee, K. & Charoenphandhu, N. Osmoregulatory adaptations of freshwater air-breathing snakehead fish (Channa striata) after exposure to brackish water. J Comp Physiol B 185, 527–537 (2015). https://doi.org/10.1007/s00360-015-0902-z
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DOI: https://doi.org/10.1007/s00360-015-0902-z