Please use this identifier to cite or link to this item: https://dspace.ctu.edu.vn/jspui/handle/123456789/4158
Title: High capacity for extracellular acid–base regulation in the air-breathing fish Pangasianodon hypophthalmus
Authors: Damsgaard, Christian
Đỗ, Thị Thanh Hương
Phan, Vinh Thinh
Dang, Diem Tuong
Le, Thi Hong Gam
Bayley, Mark
Wang, Tobias
Keywords: Carbondioxide
Hypercapnia
Hypoxia
Pangasius
Issue Date: 2015
Series/Report no.: The Journal of Experimental Biology;218 .- p.1290-1294
Abstract: The evolution of accessory air-breathing structures is typically associated with reduction of the gills, although branchial ion transport remains pivotal for acid-base and ion regulation. Therefore, airbreathing fishes are believed to have a low capacity for extracellular pH regulation during a respiratory acidosis. In the present study, we investigated acid-base regulation during hypercapnia in the airbreathing fish Pangasianodon hypophthalmus in normoxic and hypoxic water at 28-30°C. Contrary to previous studies, we show that this air-breathing fish has a pronounced ability to regulate extracellular pH ( pHe) during hypercapnia, with complete metabolic compensation of pHe within 72 h of exposure to hypoxic hypercapnia with CO2 levels above 34 mmHg. The high capacity for pHe regulation relies on a pronounced ability to increase levels of HCO3- in the plasma. Ourstudy illustrates the diversity in the physiology of air-breathing fishes, such that generalizations across phylogenies may be difficult.
URI: http://dspace.ctu.edu.vn/jspui/handle/123456789/4158
Appears in Collections:Tạp chí quốc tế

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