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REPORT OF THE WORKSHOP ON MODELLING CATCH-PER-UNIT-EFFORT (WKCPUE)

Report of the workshop on modelling Catch-Per-Unit-Effort (WKCPUE)
Authors: Coelho, Rui; Fernandes, Ana Cláudia; Mendes, Hugo; Moura, Teresa; Serra-Pereira, Bárbara; Silva, Andreia V.; Silva, Cristina; +1 Authors

REPORT OF THE WORKSHOP ON MODELLING CATCH-PER-UNIT-EFFORT (WKCPUE)

Abstract

A Captura por Unidade de Esforço (CPUE) estandardizada de pescarias comerciais, ou seja, dados de capturas comerciais modelados estatisticamente para remoção dos efeitos dependentes da pesca, são por vezes utilizados como indicadores indiretos de abundância e de biomassa na avaliação de stocks. Neste trabalho, reportamos os resultados de um workshop de modelação de CPUEs que teve lugar virtualmente nos dias 3-5 Novembro 2020 e 6-7 Janeiro 2021, organizado pelo IPMA e integrado no âmbito do PNAB/DCF (Programa Nacional de Amostragem Biológica). Apresentamos um sumário dos métodos usados, focando sobretudo Modelos Lineares Generalizados (GLM) usando distribuição Tweedie para tratamento de capturas zero. Providenciamos exemplos de casos-estudo desenvolvidos e discutidos no workshop, nomeadamente lagostim (Nephrops norvegicus) capturado pela frota de arrasto de crustáceos, tamboril-sovaco-preto (Lophius budegassa) capturado pela frota polivalente, rejeições de cavala (Scomber colias) e pescada (Merluccius merluccius) capturados pela frota Portuguesa de arrasto. As discussões relativas à exploração dos dados e ajuste dos modelos resultou em algumas recomendações para trabalho futuro, sumarizadas no final deste relatório.

Standardized Catch-Per-Unit-Effort (CPUE), i.e., data from commercial fisheries that have been statistically modelled to remove fishery dependant effect, are often used in stock assessments as indicators of abundance and biomass. Here we report the outcomes of the workshop on modeling CPUEs that took place virtually on the 3-5 November 2020 and 6-7 January 2021 organized by IPMA and integrated in PNAB/DCF (National Program of Biological Sampling). We provide a summary of the methods used, focusing particularly on Generalized Linear Models (GLM) with Tweedie distributions for treatment of zero captures. We provide examples of case-studies developed and discussed, namely Norway lobster (Nephrops norvegicus) caught by crustacean trawlers, black-bellied anglerfish (Lophius budegassa) caught by the polyvalent fleet, chub mackerel (Scomber colias) discards and hake (Merluccius merluccius) caught by the Portuguese trawl fleet. The discussions on the exploration of input data and model fitting resulted in some recommendation for future work, summarized at the end of the report.

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Portugal
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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
Green