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

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dc.contributor.authorFitzgibbon, Q.
dc.contributor.authorSeymour, R.
dc.contributor.authorEllis, D.
dc.contributor.authorBuchanan, J.
dc.date.issued2007
dc.descriptionCopyright © 2007 The Company of Biologists
dc.description.abstractThe effect of feeding on the rate of oxygen consumption (O2) of four groups of three southern bluefin tuna Thunnus maccoyii (SBT) was examined in a large static respirometer at water temperatures of 18.2-20.3°C. Six feeding events of rations between 2.1-8.5% body mass (%Mb) of Australian sardines (Sardinops neopilchardus) were recorded (two of the groups were fed twice). Before feeding, fish swam between 0.71 and 1.4 body lengths s-1 (BL s-1) and the routine metabolic rate (RMR) was 366±32.5 mg kg-1 h-1 (mean ± s.e.m.). For all trials, O2 was elevated post feeding, presumably as a result of specific dynamic action (SDA). Swimming velocity was also elevated post feeding for periods similar to that of O2 (between 20-45 h, longest for the largest rations). Post feeding swimming velocity increased to between 0.87-2.6 BL s-1 and was also dependent on ration consumed. It is suggested that the purpose of increased post-feeding swimming velocity was to increase ventilation volume as a response to the enhanced metabolic demand associated with SDA. Peak post-prandial O2 increased linearly with ration size to a maximum of 1290 mg kg-1 h-1, corresponding to 2.8 times the RMR. When converted to its energy equivalent, total magnitude of SDA was linearly correlated with ration size to a maximum of 192 kJ kg-1 h-1, and as a proportion of gross energy ingested (SDA coefficient), it averaged 35±2.2%. These results demonstrate that, although the factorial increase of SDA in SBT is similar to that of other fish species, the absolute energetic cost of SDA is much higher. These results support the contention that tuna are energy speculators, gambling high rates of energy expenditure for potentially higher rates of energy returns. The ration that southern bluefin tuna require to equal the combined metabolic costs of SDA and RMR is estimated in this study to be 3.5%Mb of Australian sardines per day.
dc.description.statementofresponsibilityQ. P. Fitzgibbon, R. S. Seymour, D. Ellis and J. Buchanan
dc.identifier.citationThe Journal of Experimental Biology, 2007; 210(2):290-298
dc.identifier.doi10.1242/jeb.02641
dc.identifier.issn0022-0949
dc.identifier.issn1477-9145
dc.identifier.orcidSeymour, R. [0000-0002-3395-0059]
dc.identifier.urihttp://hdl.handle.net/2440/43082
dc.language.isoen
dc.provenanceFirst published online January 8, 2007
dc.publisherCompany of Biologists Ltd
dc.source.urihttps://doi.org/10.1242/jeb.02641
dc.subjecttuna
dc.subjectspecific dynamic action
dc.subjectheat increment of feeding
dc.subjectoxygen consumption
dc.subjectenergetics
dc.subjectSouthern bluefin tuna
dc.subjectThunnus maccoyii
dc.titleThe energetic consequence of specific dynamic action in southern bluefin tuna Thunnus maccoyii
dc.typeJournal article
pubs.publication-statusPublished

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