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The risk to fishery performance associated with spatially resolved management of Antarctic krill (Euphausia superba) harvesting

Hill, Simeon L.; Trathan, Philip N.; Agnew, David J.. 2009 The risk to fishery performance associated with spatially resolved management of Antarctic krill (Euphausia superba) harvesting. ICES Journal of Marine Science, 66 (10). 2148-2154. 10.1093/icesjms/fsp172

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Abstract/Summary

The ecosystem approach to fisheries attempts to define objectives for target species, the wider ecosystem, and critically, the fishery itself. Proposals for implementing the approach often include spatial restrictions on harvesting, so it is important to understand how these will affect fishery performance. One metric of potential performance is the probability of encountering exploitable densities of a target species at the scale of fishing operations. The probability of encountering exploitable densities of Antarctic krill, Euphausia superba, at the scale of 1 nautical mile during an acoustic survey was predicted by bathymetry and the mean krill density at the larger scale at which the fishery is managed. This suggests that the risk to fishery performance will increase if management actions relocate the fishery into deeper water. The results also suggest that ecosystem models resolved to the spatial scale of management units could usefully predict effects at the scale of fishing operations. However, correct parameterization of these models will require better characterization of threshold densities for efficient exploitation. Finally, the distribution of catch and fishing effort over an entire fishing season reflected the distribution of krill density observed during the survey.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1093/icesjms/fsp172
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > DISCOVERY 2010 - Integrating Southern Ocean Ecosystems into the Earth System
ISSN: 1054-3139
NORA Subject Terms: Marine Sciences
Ecology and Environment
Date made live: 02 Nov 2010 13:27
URI: http://nora.nerc.ac.uk/id/eprint/11021

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