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Postprandial metabolic increment of southern bluefin tuna Thunnus maccoyii ingesting high or low-lipid sardines Sardinops sagax

Citation

Fitzgibbon, QP and Seymour, RS, Postprandial metabolic increment of southern bluefin tuna Thunnus maccoyii ingesting high or low-lipid sardines Sardinops sagax, Journal of Fish Biology, 75, (7) pp. 1586-1600. ISSN 0022-1112 (2009) [Refereed Article]


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The definitive published version is available online at: http://interscience.wiley.com

DOI: doi:10.1111/j.1095-8649.2009.02385.x

Abstract

This study examined the postprandial metabolism and swimming speed of southern bluefin tuna Thunnus maccoyii when fed sardines Sardinops sagax of either high-lipid and high-energy content or low-lipid and low-energy content. Five groups of two or three T. maccoyii (mean s.e. mass = 198 05 kg, n = 14) were fed either low [22% lipid, 55 MJ kg−1 gross energy (GE)] or high-lipid (129%, 92 MJ kg−1 GE) S. sagax. Before feeding, T. maccoyii swam at 074 003 body lengths s−1 (n = 5) and their routine metabolic rate was 305 15 mg kg−1 h−1. Swimming speed and metabolic rate of T. maccoyii increased following feeding. Thunnus maccoyii swam 13 and 18 times faster during digestion of low and high-lipid S. sagax, respectively. Postprandial peak metabolic rate, duration of elevated metabolism and total postprandial metabolic increment were all greater for T. maccoyii that ingested high-lipid S. sagax. When total postprandial increment is represented as a proportion of ingested energy, there was no difference between high and low-lipid meals, equating to between 30 and 35% of ingested energy. It was estimated that increased postprandial swimming costs account for 25 and 46% of the total postprandial metabolic response for low and high-lipid S. sagax meals, respectively. Specific dynamic action (SDA) accounts for c. 20% of ingested energy regardless of S. sagax lipid level. These results confirm that the postprandial metabolic increment of T. maccoyii is greater than most other fish species. Much of the high cost of postprandial metabolic increment can be attributed to increased postprandial swimming costs. For T. maccoyii, it appears that activity and SDA are not independent, which complicates bioenergetic evaluation. High postprandial metabolic costs accentuate the great energetic requirements of T. maccoyii

Item Details

Item Type:Refereed Article
Keywords:bioenergetics dietary composition heat increment of feeding respiratory metabolism specific dynamic action swimming speed
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Fish Physiology and Genetics
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Aquaculture Tuna
Author:Fitzgibbon, QP (Dr Quinn Fitzgibbon)
ID Code:60547
Year Published:2009
Web of Science® Times Cited:6
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2010-02-11
Last Modified:2010-04-22
Downloads:0

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