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The development of an operational model and simulation procedure for testing uncertainties in the Atlantic big eye (Thunnus obesus) stock assessment

Authors
Publisher
ICCAT
Publication Date
Keywords
  • Thon
  • Estimation De Stock
  • Modele
  • Gestion Des Peches
Disciplines
  • Biology

Abstract

The development of an operational model and simulation procedure for testing uncertainties in the Atlantic big eye (Thunnus obesus) stock assessment SCRS/2004/063 Col. Vol. Sci. Pap. ICCAT, 57(2): 162-176 (2005) 162 THE DEVELOPMENT OF AN OPERATIONAL MODEL AND SIMULATION PROCEDURE FOR TESTING UNCERTAINTIES IN THE ATLANTIC BIGEYE (THUNNUS OBESUS) STOCK ASSESSMENT Pilar Pallarés1, María Soto1, D. J. Die2, D. Gaertner3, I. Mosqueira4, L. Kell5 SUMMARY Atlantic bigeye is a highly migratory species widely distributed through the whole Atlantic. Recent assessments conducted by the ICCAT SCRS are highly uncertain due to the large uncertainties in biological parameters, such as M, as well as in fishery statistics (e.g., IUU fleets, juvenile catch) or abundance indexes. Similar uncertainties can be found in the Indian or Pacific stocks. The development of an operational model has been recommended by different regional fishery organizations as a good approach to investigate the sensitivity of the assessment results to the uncertainties in the different inputs. This document presents an operational model for the Atlantic bigeye as part of a simulation framework that will allow the performance of management strategies based on current and improved biological knowledge and management procedures to be evaluated. RÉSUMÉ Le thon obèse de l’Atlantique est un grand migrateur largement réparti dans l’ensemble de l’Atlantique. Les dernières évaluations menées par le SCRS de l’ICCAT sont très incertaines compte tenu des grandes incertitudes associées aux paramètres biologiques, tels que M, ainsi qu’aux statistiques de pêche (par exemple les flottilles IUU, la prise de juvéniles) ou aux indices d’abondance. Des incertitudes similaires sont également associées aux stocks de l’Océan Indien et de l’Océan Pacifique. Le développement d’un modèle opérationnel a été recommandé par différentes organisations régionales des pêches comme une bonne approche pour che

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