A preliminary stock assessment of bigeye tuna in the Western and Central Pacific Ocean using stock synthesis; a comparison with multifan-CL [SA WP2] Adam Langley and Richard Methot

By: Contributor(s): Material type: ArticleArticleLanguage: ENG Publication details: [Pohnpei, Federated States of Micronesia] Western and Central Pacific Fisheries Commission (WCPFC) 2008Description: 30 p. ill., graphs 30 cmSubject(s): DDC classification:
  • 639.27783
Online resources: Summary: "A parallel assessment of the current WCPO bigeye assessment, conducted using MULTIFAN-CL (MFCL), was undertaken using Stock Synthesis (SS) software. The two models incorporated the equivalent data sets (catch, effort, size composition, and tag data) and, where possible, the MFCL assumptions were mimicked in the SS model. Differences in the underlying model structure were noted, where relevant. The SS model yielded comparable trends in region-specific recruitment, biomass, and fishing mortality rates to the MFCL assessment. The length-based selectivity formulation, available in SS but not currently available in MFCL, was also applied in a sensitivity analysis to address a potential conflict between key data sets incorporated in the model. It is recommended that SS be applied to other WCPO assessments in parallel with MFCL."
Item type: Meeting Paper
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Holdings
Current library Call number Status Date due Barcode
SPC Special Collections SPC 639.277 83 WES 2008 Available

"WCPFC-SC4-2008/SA-WP-2"

Includes bibliographical references (p. 9-10)

"A parallel assessment of the current WCPO bigeye assessment, conducted using MULTIFAN-CL (MFCL), was undertaken using Stock Synthesis (SS) software. The two models incorporated the equivalent data sets (catch, effort, size composition, and tag data) and, where possible, the MFCL assumptions were mimicked in the SS model. Differences in the underlying model structure were noted, where relevant. The SS model yielded comparable trends in region-specific recruitment, biomass, and fishing mortality rates to the MFCL assessment. The length-based selectivity formulation, available in SS but not currently available in MFCL, was also applied in a sensitivity analysis to address a potential conflict between key data sets incorporated in the model. It is recommended that SS be applied to other WCPO assessments in parallel with MFCL."