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2011•DIGITAL.CSIC (Spanish National Research Council (CSIC))Open access

Applying a Bayesian model incorporating discards in the assessment of four-spot megrim (Lepidorhombus boscii) Southern stock

Esther Abad, C. Fernández-Llana, M.N. Pérez-Contreras

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Abstract

Since 2003 when the DCF started at European level by countries, discards data are \navailable for many stocks. Four-spot megrim is traditionally assessed with XSA (extended \nsurvivor analysis) which does not include discards. For this species, discards \nin number are very important, being around the 60% of total catch. A Bayesian model \nincorporating discards was realized for the hake stock in ICES Divisions VIIIc and \nIXa by Fernández et al. (2010). This model was also designed to produce a complete \ntime-series of discard estimates. Final run of the model is compared with results from \nXSA performed in the working group of 2010, showing that mayor differences are in \nthe fishing mortality for younger ages, being higher incorporating discards data.

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Since 2003 when the DCF started at European level by countries, discards data are \navailable for many stocks. Four-spot megrim is traditionally assessed with XSA (extended \nsurvivor analysis) which does not include discards. For this species, discards \nin number are very important, being around the 60% of total catch. A Bayesian model \nincorporating discards was realized for the hake stock in ICES Divisions VIIIc and \nIXa by Fernández et al. (2010). This model was also designed to produce a complete \ntime-series of discard estimates. Final run of the model is compared with results from \nXSA performed in the working group of 2010, showing that mayor differences are in \nthe fishing mortality for younger ages, being higher incorporating discards data.

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Available abstract

Since 2003 when the DCF started at European level by countries, discards data are \navailable for many stocks. Four-spot megrim is traditionally assessed with XSA (extended \nsurvivor analysis) which does not include discards. For this species, discards \nin number are very important, being around the 60% of total catch. A Bayesian model \nincorporating discards was realized for the hake stock in ICES Divisions VIIIc and \nIXa by Fernández et al. (2010). This model was also designed to produce a complete \ntime-series of discard estimates. Final run of the model is compared with results from \nXSA performed in the working group of 2010, showing that mayor differences are in \nthe fishing mortality for younger ages, being higher incorporating discards data.

Key concepts: Discards, Stock (firearms), Fishing, Environmental science, Statistics, Demography, Geography, Mathematics

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Applying a Bayesian model incorporating discards in the assessment of four-spot megrim (Lepidorhombus boscii) Southern stock — Research Paper | ScholarLens