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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on November 3, 2006
ICES Journal of Marine Science: Journal du Conseil 2007 64(1):3-17; doi:10.1093/icesjms/fsl017
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© 2006 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Short-term stock assessment of Loligo gahi at the Falkland Islands: sequential use of stochastic biomass projection and stock depletion models

Rubén Roa-Ureta and Alexander I. Arkhipkin

Department of Fisheries, PO Box 598, Stanley, Falkland Islands

Correspondence to R. Roa-Ureta: present address: Departamento de Oceanografia, PO Box 160-C, Universidad de Concepción, Concepción, Chile; tel: +56 41 203765; fax: +56 41 256571; e-mail: rroa{at}udec.cl

Roa-Ureta, R. and Arkhipkin, A. I. 2007. Short-term stock assessment of Loligo gahi at the Falkland Islands: sequential use of stochastic biomass projection and stock depletion models – ICES Journal of Marine Science, 64, 3–17.

Two short-term stock assessment models are combined to examine the pre-season, in-season, and post-season dynamics of the Loligo gahi fishery off the Falkland Islands over four consecutive fishing seasons. A stochastic biomass projection model (SBPM) projects a pre-season survey-based biomass estimate from the date of the survey to the start of the season. A stock depletion model (SDM) assesses in-season biomass from commercial daily catch-and-effort data. The SBPM projects the SDM biomass estimate at the end of the season to a post-season date of spawning. Combining the SBPM and the SDM helps to clarify the spatio-temporal functioning of the stock and to assess the comparability of survey- and fishery-based estimates of biomass. For the first 2005 season, projected length frequencies indicate two pulses of recruitment onto the fishing grounds. Survey-based projections of biomass were lower than equivalent fishery-based estimates. Over two surveys, the sex ratio was balanced, suggesting full recruitment of both sexes onto the fishing grounds, and the ratio of survey-projected to fishing-estimated biomass was constant. This constant is interpreted as a scaling factor between survey biomass and absolute biomass.

Keywords: biomass projection model, Falkland Islands, Loligo gahi, stock assessment, stock depletion model

Received 2 June 2006; accepted 14 September 2006; advance access publication 3 November 2006.


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