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Rapid depletion of genotypes with fast growth and bold personality traits from harvested fish populations

Biro, Peter A. and Post, John R. 2008, Rapid depletion of genotypes with fast growth and bold personality traits from harvested fish populations, National academy of sciences. Proceedings, vol. 105, no. 8, pp. 2919-2922, doi: 10.1073/pnas.0708159105.

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Title Rapid depletion of genotypes with fast growth and bold personality traits from harvested fish populations
Author(s) Biro, Peter A.ORCID iD for Biro, Peter A. orcid.org/0000-0002-3565-240X
Post, John R.
Journal name National academy of sciences. Proceedings
Volume number 105
Issue number 8
Start page 2919
End page 2922
Total pages 4
Publisher National Academy of Sciences
Place of publication Washington, D. C.
Publication date 2008-02-26
ISSN 0027-8424
1091-6490
Keyword(s) behavior
fisheries
selection
temperament
Summary The possibility for fishery-induced evolution of life history traits is an important but unresolved issue for exploited fish populations. Because fisheries tend to select and remove the largest individuals, there is the evolutionary potential for lasting effects on fish production and productivity. Size selection represents an indirect mechanism of selection against rapid growth rate, because individual fish may be large because of rapid growth or because of slow growth but old age. The possibility for direct selection on growth rate, whereby fast-growing genotypes are more vulnerable to fishing irrespective of their size, is unexplored. In this scenario, faster-growing genotypes may be more vulnerable to fishing because of greater appetite and correspondingly greater feeding-related activity rates and boldness that could increase encounter with fishing gear and vulnerability to it. In a realistic whole-lake experiment, we show that fast-growing fish genotypes are harvested at three times the rate of the slow-growing genotypes within two replicate lake populations. Overall, 50% of fast-growing individuals were harvested compared with 30% of slow-growing individuals, independent of body size. Greater harvest of fast-growing genotypes was attributable to their greater behavioral vulnerability, being more active and bold. Given that growth is heritable in fishes, we speculate that evolution of slower growth rates attributable to behavioral vulnerability may be widespread in harvested fish populations. Our results indicate that commonly used minimum size-limits will not prevent overexploitation of fast-growing genotypes and individuals because of size-independent growth-rate selection by fishing.
Language eng
DOI 10.1073/pnas.0708159105
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 ©2008, by The National Academy of Sciences of the USA
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047902

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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