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In Situ Cardiac Performance Of Pacific Bluefin Tuna Hearts In Response To Acute Temperature Change, Jason M. Blank, Jeffery M. Morrissette, Ana M. Landeira-Fernandez, Susanna B. Blackwell, Thomas D. Williams, Barbara A. Block
In Situ Cardiac Performance Of Pacific Bluefin Tuna Hearts In Response To Acute Temperature Change, Jason M. Blank, Jeffery M. Morrissette, Ana M. Landeira-Fernandez, Susanna B. Blackwell, Thomas D. Williams, Barbara A. Block
Biological Sciences
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 …