Data/hora: 06/06/2024 09:21:01

Provedor de dados: | 5
País: | France
Título: | A geostatistical method for assessing biomass of tuna aggregations around moored fish aggregating devices with star acoustic surveys
Autores: | Doray, Mathieu; Petitgas, Pierre; Josse, E.
Data: | 2008-06
Ano: | 2008
Palavras-chave: | Acoustic survey precision; Advection diffusion model; Moored fish aggregating devices; Tuna; Geostatistics.
Resumo: | Universal kriging was used to model the spatio-temporal variability in the acoustic density of tuna aggregations recorded during star echosounding surveys around moored fish aggregating devices (FADs) in Martinique (Lesser Antilles). The large-scale deterministic drift in the tuna spatial distribution was modeled using an advection-diffusion equation applied to animal grouping. Residuals from the drift were modeled as a random component with small-scale spatial correlation. An estimation variance formula was derived from this deterministic-statistical mixed model to assess the mean precision of density estimates of daytime tuna aggregation. The mean relative error obtained with our star design for daytime surveys was 24%. The methodology was applied to estimate daily maxima of tuna biomass around moored FADs during four monthly sea cruises. The daily peak of tuna biomass aggregated around moored FADs was 9 t on average (standard deviation = 4). Estimation variances for different survey designs were compared for optimizing sampling strategy.
Tipo: | Text
Idioma: | Inglês

Identificador:

http://archimer.ifremer.fr/doc/2008/publication-4559.pdf

DOI:10.1139/F08-050

Editor: | NRC
Relação: | http://archimer.ifremer.fr/doc/00000/4559/
Formato: | application/pdf
Fonte: | Canadian journal of fisheries and aquatic sciences (0706-652X) (NRC), 2008-06 , Vol. 65 , N. 6 , P. 1193-1205
Fonte: | 2008 National Research Council Canada