Data/hora: 07/06/2024 02:27:44

Provedor de dados: | 5
País: | France
Título: | Campagne d’évaluation du stock de palourdes du bassin d’Arcachon. Année 2018
Autores: | Sanchez, Florence; Caill-milly, Nathalie; Lissardy, Muriel.
Data: | 2018-11
Ano: | 2018
Palavras-chave: | Évaluation de stock; Palourde japonaise; Venerupis philippinarum; Bassin d’Arcachon Key words: stock assessment; Manila clam; Venerupis philippinarum; Arcachon Bay.
Resumo: | This report details the results of clam stock assessment survey, which took place between 14 May and 17 June 2018 in Arcachon Bay. Co-organized with CDPMEM33, with financial support from DLAL FEAMP Arcachon Basin Val de l'Eyre, Nouvelle-Aquitaine region, the CDPMEM33 and Ifremer, the clam stock assessment and its characteristics were provided. The samples were collected from 533 sampling stations distributed over an area of 52 km², with an Hamon grab, using a generalized random tessellation stratified spatially balanced design (GRTS). Venerupis philippinarum remains the dominant species with 99 % of the population. The size distribution of Manila clam is in the range 5 – 41 mm with a main mode around 24-28 mm. In 2018, the mean densities are 39 individuals per m² and 192 g per m². The total biomass (all species) is estimated about 8 242 tons (including 8 194 tons for V. philippinarum) and 1 684 millions of individuals (including 1 673 millions for V. philippinarum). Regarding V. Philippinarum, the exploitable fraction (L ≥ 35 mm) is about 2,4 % in numbers and 6 % in biomass, i.e. 41 millions of individuals and 490 tons. The juveniles abundance (L &lt; 17 mm) is estimated about 128 millions of individuals and 63 tons, i.e. 8 % in numbers and less than 1 % in biomass. The spawning stock biomass (L ≥ 25 mm) is 6 966 tons for 1 125 millions of individuals, i.e. 85 % in biomass and 67 % in numbers. The stock of Manila clams thus remains at a high level, but the exploitable and juveniles fractions have sharply decreased since the last assessment in 2014.
Tipo: | Text
Idioma: | Francês

Identificador:

https://archimer.ifremer.fr/doc/00477/58897/61456.pdf

https://archimer.ifremer.fr/doc/00477/58897/

Formato: | application/pdf

Fonte:

info:eu-repo/semantics/openAccess

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