Data/hora: 09/06/2024 12:33:53

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