Browsing by Author "Mendes, Hugo"
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- REPORT OF THE WORKSHOP ON MODELLING CATCH-PER-UNIT-EFFORT (WKCPUE)Publication . Coelho, Rui; Fernandes, Ana Cláudia; Mendes, Hugo; Moura, Teresa; Serra-Pereira, Bárbara; Silva, Andreia V.; Silva, Cristina; Azevedo, Manuela; Instituto Português do Mar e da Atmosfera, I.P.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.