Journal
JOURNAL OF EXPERIMENTAL BIOLOGY
Volume 223, Issue 4, Pages -Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.216481
Keywords
Gas exchange partitioning; Air-breathing fish; pH regulation
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Funding
- Danish Ministry of Foreign Affairs (DANIDA
- DFC) [12-014AU]
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Chitala ornata is a facultative air-breathing fish, which at low temperatures shows an arterial P-CO2 (Pa-CO2) level only slightly elevated above that of water breathers. By holding fish with indwelling catheters at temperatures from 25 to 36 degrees C and measuring blood gasses, we show that this animal follows the ubiquitous poikilotherm pattern of reducing arterial pH with increasing temperature. Surprisingly, the temperature increase caused an elevation of Pa-CO2 from 5 to 12 mmHg while the plasma bicarbonate concentration remained constant at around 8 mmol l(-1). The temperature increase also gave rise to a larger fractional increase in air breathing than in gill ventilation frequency. These findings suggest that air breathing, and hence the partitioning of gas exchange, is to some extent regulated by acid-base status in air-breathing fish and that these bimodal breathers will be increasingly likely to adopt respiratory pH control as temperature rises, providing an interesting avenue for future research.
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