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In vivo aerobic metabolism of the rainbow trout gut and the effects of an acute temperature increase and stress event

Journal article
Authors J. Brijs
A. Grans
P. Hjelmstedt
Erik Sandblom
N. van Nuland
C. Berg
Michael Axelsson
Published in Journal of Experimental Biology
Volume 221
Issue 14
ISSN 0022-0949
Publication year 2018
Published at Department of Biological and Environmental Sciences
Language en
Links dx.doi.org/10.1242/jeb.180703
Keywords Gastrointestinal, Teleost, Oxygen consumption, Metabolism, Energy expenditure, gastrointestinal blood-flow, bass dicentrarchus-labrax, oncorhynchus-mykiss, oxygen-consumption, cardiac-output, portal-vein, sea, hypoxia, cannulation, extraction, Life Sciences & Biomedicine - Other Topics, lean e, 1989, aquaculture, v78, p195
Subject categories Biological Sciences

Abstract

The fish gut is responsible for numerous potentially energetically costly processes, yet little is known about its metabolism. Here, we provide the first in vivo measurements of aerobic metabolism of the gut in a teleost fish by measuring gut blood flow, as well as arterial and portal venous oxygen content. At 10 degrees C, gut oxygen uptake rate was 4.3 +/- 0.5 ml O-2 h(-1) kg(-1) (similar to 11 % of whole-animal oxygen uptake). Following acute warming to 15 degrees C, gut blood flow increased similar to 3.4-fold and gut oxygen uptake rate increased similar to 3.7-fold (16.0 +/- 3.3 ml O-2 h(-1) kg(-1)), now representing similar to 25% of whole-animal oxygen uptake. Although gut blood flow decreased following an acute stress event at 15 degrees C, gut oxygen uptake remained unchanged as a result of a similar to 2-fold increase in oxygen extraction. The high metabolic thermal sensitivity of the gut could have important implications for the overall aerobic capacity and performance of fish in a warming world and warrants further investigation.

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