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Fig. 4. Effects of ambient temperature and swimming speed on gross cost of
transport (GCOT) of bluefin tuna. GCOT was calculated from measured
O2 and swimming
speed using an oxycalorific coefficient of 14.1 J mg O
–12. A significant interaction of speed and
temperature was observed (P=0.023). Values are means ± s.d. of
O2 measurements
from three individual bluefin tuna (mass=8.1±0.6 kg).