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Journal of Experimental Biology, Vol 201, Issue 7 943-948, Copyright © 1998 by Company of Biologists

JOURNAL ARTICLES

Air-breathing during activity in the fishes Amia calva and Lepisosteus oculatus

C. G. Farmer and D. C. Jackson

Many osteichthyan fishes obtain oxygen from both air, using a lung, and water, using gills. Although it is commonly thought that fishes air- breathe to survive hypoxic aquatic habitats, other reasons may be more important in many species. This study was undertaken to determine the significance of air-breathing in two fish species while exercising in oxygen- rich water. Oxygen consumption from air and water was measured during mild activity in bowfin (Amia calva) and spotted gar (Lepisosteus oculatus) by sealing a fish in an acrylic flume that contained an air-hole. At 19-23 °C, the rate of oxygen consumption from air in both species was modest at rest. During low-level exercise, more than 50 % of the oxygen consumed by both species was from the air (53.0+/-22.9 % L. oculatus; 66.4+/-8.3 % A. calva).
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© The Company of Biologists Ltd 1998