Publications des scientifiques de l'IRD

Soria Marc, Fréon Pierre, Gerlotto François. (1996). Analysis of vessel influence on spatial behaviour of fish schools using a multi-beam sonar and consequences for biomass estimates by echo-sounder. ICES Journal of Marine Science, 53, p. 453-458. ISSN 1054-3139.

Titre du document
Analysis of vessel influence on spatial behaviour of fish schools using a multi-beam sonar and consequences for biomass estimates by echo-sounder
Année de publication
1996
Type de document
Article
Auteurs
Soria Marc, Fréon Pierre, Gerlotto François
Source
ICES Journal of Marine Science, 1996, 53, p. 453-458 ISSN 1054-3139
Biases in the measurements of spatial distribution of fish schools and their consequences for school biomass estimates during conventional acoustic surveys are mainly due to vertical and lateral avoidance of the vessel. In this paper, we quantify school avoidance during an acoustic survey carried out from 10 to 29 May 1994 in the Catalan Sea. From a lateral multi-beam sonar the geometric characteristics (depth, length, width, height, surface, and volume) of 1268 schools were obtained. The 60 beams (1.5° X 15°) of the sonar scanned a vertical plane from 0° to 90°, perpendicular to the vessel path within a range of 100 m. Within this plane, the projected area ensonified by the echo-sounder used aboard for acoustic evaluation was evaluated to simulate a comparison between the sonar and the echo-sounder. The results have enabled us to improve our knowledge on the vertical and lateral avoidance patterns of schools in relation to their size, external structure, and their position in the water column, and to quantify the vessel influence on biomass estimated by echo-sounder. (Résumé d'auteur)
Plan de classement
Stocks [040PECHE03]
Descripteurs
POISSON MARIN ; ESPECE PELAGIQUE ; DISTRIBUTION SPATIALE ; ESTIMATION DE STOCK ; SONAR ; BANC DE POISSONS
Description Géographique
MEDITERRANEE
Localisation
Fonds IRD [F B010008040] ; Montpellier (Centre IRD)
Identifiant IRD
fdi:010008040
Contact