External review of ICCAT bigeye tuna stock assessment (ICCAT SCRS/2018/148)
This document provides a review of the bigeye stock assessment conducted by ICCAT in 2018. The work done for this assessment is of high quality, both in terms of data aspects as well as methods for assessment and provision of management advice. Very considerable efforts appear to have been made over...
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2018 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/328386 |
| Acceso en línea: | http://hdl.handle.net/10261/328386 |
| Access Level: | acceso abierto |
| Palabra clave: | Bigeye tuna (BET) Pesquerías Centro Oceanográfico de Vigo Thunnus obesus Atlantic Stock assessment Review |
| Sumario: | This document provides a review of the bigeye stock assessment conducted by ICCAT in 2018. The work done for this assessment is of high quality, both in terms of data aspects as well as methods for assessment and provision of management advice. Very considerable efforts appear to have been made over the years to improve the quality of the data available for the stock assessment; this is very important given the high complexity of the fisheries. Surplus production models and the age-structured SS3 model (fitted to length but no age data) were implemented. Of these, the SS3 implementation is considered to be the most suitable for the assessment of this stock and to provide management advice, mostly because of the very different selectivities of some of the main fleets which has led to changes in the overall selectivity for the total fishery on the stock over time. All methods applied reached the conclusion that there is presently a high probability of B<Bmsy and F>Fmsy, corresponding to the red quadrant of the Kobe plot. Efforts to continue to develop and improve the longline CPUE index used in the stock assessment are strongly encouraged, as is the development of an abundance index for juvenile bigeye tuna. Future work considering ways to more fully incorporate all relevant sources of uncertainty in the projections and evaluating harvest strategies taking due account of uncertainty via MSE is of high relevance and seems to be planned already. |
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