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First published online January 8, 2007
Journal of Experimental Biology 210, 290-298 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.02641

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The energetic consequence of specific dynamic action in southern bluefin tuna Thunnus maccoyii

Q. P. Fitzgibbon^1,2,*, R. S. Seymour^1,2, D. Ellis^2,3 and J. Buchanan^2,4

¹ University of Adelaide, Adelaide, 5005, Australia
² Aquafin CRC, Henley Beach, South Australia, 5022, Australia
³ Tuna Boat Owners Association of South Australia, Port Lincoln, 5606, Australia
⁴ South Australian Research and Development Institute, Adelaide, 5022, Australia

View larger version (80K): [in this window] [in a new window]   Fig. 1. (A) The mesocosm respirometer. (B) Diagram showing 1entrance port, 2windows, 3 sample ports, 4wave break wall, 5cable entrance ports, 6oxygen probes, 7float, 8lead weights, 9video cameras, 10lights and 11water level.

View larger version (4K): [in this window] [in a new window]   Fig. 2. Oxygen consumption rates (O2) of three SBT after introduction into the mesocosm respirometer, showing the plateau in O2 within 7 h after transfer and subsequently calculated mean routine metabolic rate [RMR, broken line; values are means ± s.e.m. of measurements (3 h periods)].

View larger version (7K): [in this window] [in a new window]   Fig. 3. (A) The relationship between the routine swimming velocity (Ur, BL s-1) and the routine metabolic rate (RMR) of southern bluefin tuna with fitted linear regression (y=219x-166, R2=0.94). Values shown are means ± s.e.m. (N=5-9). (B) The relationship between ration consumed (%Mb) and the factorial increase swimming velocity recorded during the SDA period (%Ur) with fitted linear regression (y=14.1x+82.5, R2=0.53). Values are means ± s.e.m. (N=5-15).

View larger version (17K): [in this window] [in a new window]   Fig. 4. Post feeding oxygen consumption rate for southern bluefin tuna for the six feeding events recorded of ration size between 2.1 and 8.5% body mass (%Mb) in the four mesocosm respirometer experiments (A-D). Broken line represents the calculated routine metabolic rate (RMR).

View larger version (8K): [in this window] [in a new window]   Fig. 5. Relationship between southern bluefin tuna ration size (%Mb) and (A) specific dynamic action (SDA) peak with fitted regression (y=124x+190, R2=0.71), (B) SDA duration (y=2.7x+15.8, R2=0.38) and (C) SDA magnitude (y=25.2x+26.7, R2=0.98), for the six feeding events recorded in the mesocosm respirometer.

View larger version (5K): [in this window] [in a new window]   Fig. 6. Relationship between southern bluefin tuna ration size and total energy consumption (calculated as the total oxygen consumption the 24 h post feeding) in the 24 h after feeding as a percentage of ingested energy for the six feeding events recorded in the mesocosm respirometer. The broken line represents the theoretical point that the amount of energy used by the fish's metabolic processes equals the amount of ingested energy.