Individual Vessel Limit (IVL) pilot study

Proyecto B.3.a - Individual Vessel Limit (IVL) pilot study

01 jul. 2022 - 31 dic. 2022

Programa(s) a cargo: Programa de Evaluación de Poblaciones

Financiado

Haga clic para ver proyectos por tema, meta u objetivo:

Tema 1. Recolección de datos en apoyo científico de la ordenación
Meta B. Realizar una revisión de los programas CIAT/APICD actuales de recolección de datos, e identificar y priorizar oportunidades para mejorar la calidad de los datos y ampliar los tipos y cobertura de dato
Objetivo B.1. Evaluar y mejorar los datos recolectados en buques cerqueros por el Programa de Observadores a Bordo para investigaciones científicas

Objetivos

Develop sampling designs for estimating well-level and trip-level catch composition to be used in the IVL enhanced port-sampling program in 2023-2024.

Antecedentes

At the 98th Meeting of the IATTC, the Commission established an IVL program for bigeye tuna catches (Resolution C-21-04), which is to include a special portsampling program (“IVL enhanced port-sampling program”) for trips considered to have caught a significant amount of bigeye tuna.
To implement the IVL enhanced port-sampling program, the sampling protocol of this program needs to be tailored to estimation of well-level and trip-level catch composition.
The sampling protocol of the current IATTC port-sampling program is not appropriate for this task because it was designed for estimation of fleet-level catch composition and was based on results of studies conducted prior to the expansion of the fishery on fish-aggregating devices in the 1990s.
Given this, as outlined in SAC-13 INF-E, an IVL pilot study is planned for the second half of 2022 to: 1) collect extensive well sampling data for a simulation study to test sampling designs for well-level and trip-level catch composition estimation; and, 2) field-test the best sampling designs from (1) to identify and mitigate any logistical issues in advance of the initiation of the IVL enhance port-sampling program in 2023.

Importancia para la ordenación

Development of sampling designs for estimation of catch composition for individual vessel trips is essential to the success of the IVL enhanced port-sampling program and to the IVL Program, more generally.

Duración

6 months

Plan de trabajo y estatus

July – October 2022: collect extensive well sampling data and conduct a simulation study to test sampling designs.
November – December 2022: Field-test sampling designs developed in the simulation study, to identify and mitigate any logistical issues.

Colaboradores externos

Government of Ecuador (4 samplers to be provided in-kind)

Productos

Reports for the SAC and the Commission; publications in peer-reviewed journals.