Standard metabolic rate predicts growth trajectory of juvenile Chinese crucian carp (Carassius auratus) under changing food availability

Zeng, L.-Q., Zhang, A.-J., Killen, S. S. , Cao, Z.-D., Wang, Y.-X. and Fu, S.-J. (2017) Standard metabolic rate predicts growth trajectory of juvenile Chinese crucian carp (Carassius auratus) under changing food availability. Biology Open, 6(9), pp. 1305-1309. (doi: 10.1242/bio.025452) (PMID:28751310) (PMCID:PMC5612233)

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Phenotypic traits vary greatly within populations and can have a significant influence on aspects of performance. The present study aimed to investigate the effects of individual variation in standard metabolic rate (SMR) on growth rate and tolerance to food-deprivation in juvenile crucian carp (Carassius auratus) under varying levels of food availability. To address this issue, 19 high and 16 low SMR (individuals were randomly assigned to a satiation diet for 3 weeks, whereas another 20 high and 16 low SMR individuals were assigned to a restricted diet (approximately 50% of satiation) for the same period. Then, all fish were completely food-deprived for another 3 weeks. High SMR individuals showed a higher growth rate when fed to satiation, but this advantage of SMR did not exist in food-restricted fish. This result was related to improved feeding efficiency with decreased food intake in low SMR individuals, due to their low food processing capacity and maintenance costs. High SMR individuals experienced more mass loss during food-deprivation as compared to low SMR individuals. Our results here illustrate context-dependent costs and benefits of intraspecific variation in SMR whereby high SMR individuals show increased growth performance under high food availability but had a cost under stressful environments (i.e., food shortage).

Item Type:Articles
Glasgow Author(s) Enlighten ID:Killen, Professor Shaun
Authors: Zeng, L.-Q., Zhang, A.-J., Killen, S. S., Cao, Z.-D., Wang, Y.-X., and Fu, S.-J.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:Biology Open
Publisher:Company of Biologists
ISSN (Online):2046-6390
Published Online:27 July 2017
Copyright Holders:Copyright © 2017 The Company of Biologists Ltd
First Published:First published in Biology Open 6(9): 1305-1309
Publisher Policy:Reproduced under a Creative Commons license

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
594261The Influence of Individual Physiology on Group Behaviour in Fish SchoolsShaun KillenNatural Environment Research Council (NERC)NE/J019100/1RI BIODIVERSITY ANIMAL HEALTH & COMPMED