Effect of water pH and calcium on ion balance in five fish species of the Mekong Delta

Yuzo R. Yanagitsuru; Charles R. Hewitt; Le Thi Hong Gam; Pham Phuong-Linh; Essie M. Rodgers; Tobias Wang; Mark Bayley; Do Thi Thanh Huong; Nguyen Thanh Phuong; Colin J. Brauner

doi:10.1016/j.cbpa.2019.02.026

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Effect of water pH and calcium on ion balance in five fish species of the Mekong Delta

Journal article

Peer reviewed

Effect of water pH and calcium on ion balance in five fish species of the Mekong Delta

Yuzo R. Yanagitsuru, Charles R. Hewitt, Le Thi Hong Gam, Pham Phuong-Linh, Essie M. Rodgers, Tobias Wang, Mark Bayley, Do Thi Thanh Huong, Nguyen Thanh Phuong and Colin J. Brauner

Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, Vol.232, pp.34-39

2019

DOI: https://doi.org/10.1016/j.cbpa.2019.02.026

PMID: 30876844

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Abstract

Acid

Fish

Freshwater

Ionoregulation

Mekong

Tolerance

Acidic freshwater habitats disrupt ion-homeostasis in fishes, yet the often acidic waters of the Mekong host the second highest diversity of freshwater fish in the world. To investigate how five Mekong fish species tolerate water acidity, we measured: time to loss of equilibrium (LOE) at sustained (4 days) low pH (3.5) and net ion flux in acute low pH (3.5 and 3) in Chitala ornata, Pangasianodon hypophthalmus, Osphronemus goramy, Trichogaster pectoralis, and Monopterus albus. Our sustained low pH exposures revealed that C. ornata was least tolerant, P. hypophthalmus and M. albus were moderately tolerant, and O. goramy and T. pectoralis were highly tolerant to low pH. In general, net ion loss in acute low pH exposures was greatest in species with the shortest time to LOE in the sustained low pH exposure. We also explored how low water [Ca2+] (relative to current Mekong levels) affected ion flux at low water pH in the least tolerant C. ornata and highly tolerant T. pectoralis. In C. ornata, low water Ca2+ (56 ± 1 μmol L−1) increased net ion loss relative to high Ca2+ (342 ± 3 μmol L−1) water while no effect was observed in T. pectoralis. Finally, we find that T. pectoralis is among the most acid-tolerant fish species examined to date.

Details

Title: Effect of water pH and calcium on ion balance in five fish species of the Mekong Delta
Authors/Creators: Yuzo R. Yanagitsuru - University of California, Davis
Charles R. Hewitt - Zoophysiology, Department of Bioscience, Aarhus University, 8000 Aarhus-C, Denmark
Le Thi Hong Gam - Can Tho University
Pham Phuong-Linh - Nha Trang University
Essie M. Rodgers - University of Antwerp
Tobias Wang - Aarhus University
Mark Bayley - Aarhus University
Do Thi Thanh Huong - Can Tho University
Nguyen Thanh Phuong - Can Tho University
Colin J. Brauner - University of British Columbia
Publication Details: Comparative biochemistry and physiology. Part A, Molecular & integrative physiology, Vol.232, pp.34-39
Publisher: Elsevier Inc
Identifiers: 991005560346207891
Murdoch Affiliation: School of Environmental and Conservation Sciences
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.2 Marine Biology; 3.2.116 Aquaculture Nutrition
Web Of Science research areas: Biochemistry & Molecular Biology; Physiology; Zoology
ESI research areas: Biology & Biochemistry