Data/hora: 02/06/2024 12:42:24

Provedor de dados: 	5	
País: 	France	
Título: 	Channel and North Sea ray stock assessment in a data limited framework	
Autores: 	Amelot, Morgane; Bastleer, Jurgen; Foucher, Eric; Girardin, Raphael; Marchal, Paul; Poos, Jan Jaap; Sys, Klaas.	
Data: 	2020-01	
Ano: 	2020	
Resumo: 	Rajidae stocks (Raja clavata, Raja brachyura, Raja montagui, Raja microocellata, Leucoraja naevus and Raja undulata) in the English Channel and North Sea (ICES divisions 3a, 4 and 7d) are actually managed as a complex (“skates and rays”) and subject to a single TAC. TAC advices from the ICES are based on scientific survey indices trends from each species. Rajidae catches are mainly bycatch from flatfish fisheries such are sole (Solea solea) and plaice (Pleuronectes platessa) fisheries. Furthermore, because of their top predator position as well as their life history, Rajidae are species sensitive to overfishing. These different factors have led to a revision in stock assessment methods. ICES classified Rajidae as category 3 data limited stocks. The lack of available data does impact stock assessment model choice. As part of SUMARiS Interreg project a set of three data limited models have been tested: CMSY, SPicT and a state space bayesian production model. All of this model results support an increase in Rajidae stock biomass since the implementation of management measures in 2009. However, differences between stocks have been highlighted. The relative biomass of Thornback ray (Raja clavata), the prevailing species in the area, is up to three times more than other species biomass. This report presents the state of art in Rajidae stock data, as well as the different assessment models tested on 30 January 2020.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	https://archimer.ifremer.fr/doc/00620/73220/72433.pdf

https://archimer.ifremer.fr/doc/00620/73220/	
Formato: 	application/pdf	
Fonte: 	info:eu-repo/semantics/openAccess

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