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Article
In Situ Cardiac Performance of Pacific Bluefin Tuna Hearts in Response to Acute Temperature Change
Journal of Experimental Biology
  • Jason M. Blank, Stanford University
  • Jeffery M. Morrissette, Stanford University
  • Ana M. Landeira-Fernandez, Stanford University
  • Susanna B. Blackwell, Stanford University
  • Thomas D. Williams, Stanford University
  • Barbara A. Block, Stanford University
Publication Date
2-15-2004
Abstract

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.

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Publisher statement
Published by The Company of Biologists.
Citation Information
Jason M. Blank, Jeffery M. Morrissette, Ana M. Landeira-Fernandez, Susanna B. Blackwell, et al.. "In Situ Cardiac Performance of Pacific Bluefin Tuna Hearts in Response to Acute Temperature Change" Journal of Experimental Biology Vol. 207 Iss. 5 (2004) p. 881 - 890
Available at: http://works.bepress.com/jmblank/9/