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Fig. 5. Visceral temperatures of bluefin tuna in the respirometer. (A) Visceral
(black) and ambient water temperature (gray) data were logged at 4 s or 8 s
intervals by archival tags implanted in the peritoneal cavity of the fish
prior to the experiment and recovered post-mortem. Swim speed was
held constant at 1.0 BL s–1 throughout the
experiment. Thermal inertia is evident as a time lag between changes in
ambient and visceral temperatures. (B) Visceral thermal excess (Tx) of bluefin
tuna swimming in the respirometer. Steady-state Tx was calculated as the
difference between visceral and ambient temperatures of fish swimming at
constant speeds of 1.0 BL s–1 following
equilibration to the designated ambient temperature for at least 2.5 h.
Temperature data were logged at 4 s or 8 s resolution by archival tags
implanted in the peritoneal cavity prior to experiments. Values shown are mean
± s.d. for N=3 bluefin tuna (N=2 at 25°C).
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