Ignoring discards biases the assessment of fisheries' ecological fingerprint

Viana, M. , McNally, L., Graham, N., Reid, D. G. and Jackson, A. L. (2013) Ignoring discards biases the assessment of fisheries' ecological fingerprint. Biology Letters, 9(6), 20130812. (doi:10.1098/rsbl.2013.0812) (PMID:24307530) (PMCID:PMC3871369)

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Abstract

Understanding the pressures of fisheries on the ecosystem is crucial for effective management. Fishery removals, or catch, are composed of both landings and discards. However, the use of discards data in studies investigating the effect of the fishing pressures is sparse. Here, we explore the individual contribution of both these catch components to the overall pressure of fisheries on the ecosystem metrics. Using Irish observer data, we compare the linear relationship between several ecological metrics calculated for landings and discards with those of catch. Our results show that in fisheries with high discarding rates, discards can drive the fisheries’ ecological fingerprint and highlight the need to rectify landings-based estimates to make them representative of those of catch in order to gain a robust picture of the impact of fisheries.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Viana, Dr Mafalda
Authors: Viana, M., McNally, L., Graham, N., Reid, D. G., and Jackson, A. L.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Biology Letters
Publisher:The Royal Society
ISSN:1744-9561
ISSN (Online):1744-957X
Published Online:04 December 2013

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