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Over-winter lipid depletion and mortality of age-0 rainbow trout (Oncorhynchus mykiss)

Biro, Peter A., Morton, Ashley E., Post, John R. and Parkinson, Eric A. 2004, Over-winter lipid depletion and mortality of age-0 rainbow trout (Oncorhynchus mykiss), Canadian journal of fisheries and aquatic sciences, vol. 61, no. 8, pp. 1513-1519, doi: 10.1139/F04-083.

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Title Over-winter lipid depletion and mortality of age-0 rainbow trout (Oncorhynchus mykiss)
Author(s) Biro, Peter A.ORCID iD for Biro, Peter A. orcid.org/0000-0002-3565-240X
Morton, Ashley E.
Post, John R.
Parkinson, Eric A.
Journal name Canadian journal of fisheries and aquatic sciences
Volume number 61
Issue number 8
Start page 1513
End page 1519
Total pages 7
Publisher N R C Research Press
Place of publication Ottawa, Ont.
Publication date 2004-08
ISSN 0706-652X
1205-7533
Keyword(s) body size
fat reserve
lipid
resource allocation
salmonid
starvation
survival
Summary In this study we identify the size-dependent risk of winter starvation mortality as a strong selective pressure on age-0 rainbow trout (Oncorhynchus mykiss) that could promote the risk-taking behaviour and allocation of energy to lipids previously observed in young trout cohorts. Age-0 trout subjected to simulated winter starvation conditions gradually depleted lipid reserves to a critical minimum lipid content below which death occurred. Small fish with lower lipid content exhausted lipid reserves earlier, and experienced high mortality rates sooner, than larger fish with greater lipid content. Consequently, winter starvation endurance was dependent upon size-dependent lipid reserves and winter duration. To validate the laboratory findings in the field, we stocked several size classes of hatchery-raised trout with known lipid content at the start of winter into two experimental lakes, and estimated survival and lipid depletion at winter's end. Larger age-0 trout had greater initial lipid reserves than smaller trout. Individuals depleted most of their lipid reserves over the winter, and experienced mortality that ranged from just under 60% for the largest individuals to just over 90% of the smallest individuals. Many survivors had lipid contents near, but none were below, the minimum lipid content determined in the laboratory.
Language eng
DOI 10.1139/F04-083
Field of Research 060201 Behavioural Ecology
060801 Animal Behaviour
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2004, NRC Canada
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047771

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