Workshop to evaluate differences in bigeye tuna age estimation methods and resulting growth models utilized in current stock assessments by the IATTC and WCPFC

Proyecto E.2.b - Workshop to evaluate differences in bigeye tuna age estimation methods and resulting growth models utilized in current stock assessments by the IATTC and WCPFC

23 ene. 2019 - 25 ene. 2019

Completado

Programa(s) a cargo: Grupo de Ciclo Vital y Comportamiento

Financiado

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Tema 2. Estudios del ciclo vital en apoyo científico de la ordenación
Meta E. Obtener información de ciclo vital y estructura de poblaciones para evaluaciones estructuradas espacialmente de los atunes tropicales
Objetivo E.2. Realizar investigaciones espaciotemporales de la biología reproductora de los atunes tropicales

Objetivos: Resolve concerns about differences in age estimation methods and resulting growth models used in bigeye tuna stock assessments by IATTC and WCPFC
Antecedentes: Although there are documented differences in the life history characteristics of the bigeye stocks from the EPO and WCPO, the magnitude of the discrepancies in the estimated length-at age data, growth models, and L∞ estimates used in the recent IATTC and WCPFC stock assessments, along with the dramatic shift in stock status of WCPO bigeye population is concerning. The estimated L∞ from the WCPO bigeye growth model is 157 cm, unrealistically low, and is highly influential in the assessment model and resulting stock status determination.
Importancia para la ordenación: Age and growth models and their estimates of L∞ are highly influential in assessing the status of bigeye in integrated assessment models
Duración: 2 days
Plan de trabajo y estatus: Workshop to be held in La Jolla, November 2018, or as soon as possible in 2019
Colaboradores externos: SPC; CSIRO and FAS, Australia; FSFRL, Japan; PIFSC
Productos: A workshop report to be shared with all interested parties