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First published online January 27, 2004
Journal of Experimental Biology 207, 881-890 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00820
In situ cardiac performance of Pacific bluefin tuna hearts in response to acute temperature change
Tuna Research and Conservation Center, Hopkins Marine Station, Department of Biological Sciences, Stanford University, Oceanview Boulevard, Pacific Grove, CA 93950, USA
* Author for correspondence (e-mail: bblock{at}stanford.edu)
Accepted 3 December 2003
This study reports the cardiovascular physiology of the Pacific bluefin tuna (Thunnus orientalis) in an in situ heart preparation. The performance of the Pacific bluefin tuna heart was examined at temperatures from 30°C down to 2°C. Heart rates ranged from 156 beats min–1 at 30°C to 13 beats min–1 at 2°C. Maximal stroke volumes were 1.1 ml kg–1 at 25°C and 1.3 ml kg–1 at 2°C. Maximal cardiac outputs were 18.1 ml kg–1 min–1 at 2°C and 106 ml kg–1 min–1 at 25°C. These data indicate that cardiovascular function in the Pacific bluefin tuna exhibits a strong temperature dependence, but cardiac function is retained at temperatures colder than those tolerated by tropical tunas. The Pacific bluefin tuna's cardiac performance in the cold may be a key adaptation supporting the broad thermal niche of the bluefin tuna group in the wild. In situ data from Pacific bluefin are compared to in situ measurements of cardiac performance in yellowfin tuna and preliminary results from albacore tuna.
Key words: Pacific bluefin tuna, Thunnus orientalis, in situ heart preparation, temperature, citrate synthase
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