Acoustic telemetry showed that stomach temperature from large bluefin tuna, Thunnus thynnus, held in an impoundment, changes markedly during feeding. The stomach cools rapidly on ingesting cold food. It then warms to a maximum of 10–15 °C above water temperature over a period of 12–20 h. Temperature decreases slowly over the next 20–30 h to a final state where it remains 3–6 °C above water temperature. The viscera are thermally isolated. Conductive heat losses are reduced by an overlying gas bladder and by the thick fatty muscle of the body wall. Convective heat losses are prevented by heat exchangers in the circulation. The temperature rise can be accounted for by heat released in the hydrolytic processes of digestion and by an increase in metabolic rate. The elevated temperatures should speed digestion and allow the tuna to feed frequently when food is abundant.
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JOURNAL ARTICLE| 01 March 1984
Bluefin Tuna Warm Their Viscera During Digestion
FRANCIS G. CAREY,
JOHN W. KANWISHER,
FRANCIS G. CAREY
1Woods Hole Oceanographic Institution Woods Hole, Massachusetts 02543, U.S.A.
JOHN W. KANWISHER
2Box 53, Woods Hole, Massachusetts 02543, U.S.A.
E. DON STEVENS
3Zoology Department, Guelph University Guelph, Ontario, Canada NIG 2W1
Accepted: 07 Nov 1983
Online Issn: 1477-9145
Print Issn: 0022-0949
© 1984 by Company of Biologists
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FRANCIS G. CAREY, JOHN W. KANWISHER, E. DON STEVENS; Bluefin Tuna Warm Their Viscera During Digestion. J Exp Biol 1 March 1984; 109 (1): 1–20. doi: https://doi.org/10.1242/jeb.109.1.1
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