Fréon Pierre, Gerlotto François, Soria Marc. (1996). Diel variability of school structure with special reference to transition periods. ICES Journal of Marine Science, 53, p. 459-464. ISSN 1054-3139.
Titre du document
Diel variability of school structure with special reference to transition periods
Année de publication
1996
Type de document
Article
Auteurs
Fréon Pierre, Gerlotto François, Soria Marc
Source
ICES Journal of Marine Science, 1996,
53, p. 459-464 ISSN 1054-3139
Pelagic fishes generally dispers at dusk and aggregate in schools at dawn. The dynamics (duration, variation in school number, and characteristics) of these two behavioural processes have been studied during a 26 h survey in a small area of high fish abundance in the Catalan Sea (Spain). The dynamics of aggregation and dispersion were investigated using a dual-beam vertical echo-sounder (BioSonics) connected to a special school integrator software package (INES-MOVIES-B) which estimates school parameters in terms of size, geometry, and density. This study shows that, during the night, fish dispersion is limited and schools can still be observed. They are characterized by a highly skewed distribution of the cross-sectional area (many small schools plus a few medium and large schools), low values of packing density and biomass, and irregular shape, while during the day there are only a few schools which have a lower variability of the area, high values of packing density, and a more regular shape. The dynamics of schooling are different between dawn (fast aggregation) and dusk (slower dispersion). (Résumé d'auteur)
Plan de classement
Poissons [034BIOVER01]
Descripteurs
POISSON MARIN ; ESPECE PELAGIQUE ; COMPORTEMENT SOCIAL ; RYTHME NYCTHEMERAL ; SONAR ; BANC DE POISSONS
