Gerlotto François. (1997). Gregariousness and school behaviour of pelagic fish : impact of the acoustics evaluation and fisheries. In :
Petit Didier (ed.), Cotel Pascal (ed.), Nugroho D. (ed.). Proceedings of acoustics seminar AKUSTIKAN 2. Luxembourg (LUX) ; Jakarta (IDN) ; Paris : Union Européenne ; CRIFI ; ORSTOM, p. 233-252. AKUSTIKAN : Seminar, 2., Bandungan (IDN), 1996/05/27-29. ISBN 979-8186-64-8.
Titre du document
Gregariousness and school behaviour of pelagic fish : impact of the acoustics evaluation and fisheries
Année de publication
1997
Type de document
Partie d'ouvrage
Auteurs
Gerlotto François
In
Petit Didier (ed.), Cotel Pascal (ed.), Nugroho D. (ed.) Proceedings of acoustics seminar AKUSTIKAN 2
Source
Luxembourg (LUX) ; Jakarta (IDN) ; Paris : Union Européenne ; CRIFI ; ORSTOM, 1997,
p. 233-252 ISBN 979-8186-64-8
Pelagic fish (Clupeids, Carangids, Engraulids, Scombroids, etc.) are normally forming dense schools, gathering over tens of thousands of individuals. This paper defines the concept of fish schools for fishery acoustics, and describes briefly their main dynamic mechanisms. The kind of spatial distribution, due to this behaviour, makes the design of appropriate sampling methodologies necessary. The effect of the heterogeneity in the spatial distribution of fish density is discussed. The impact of gregariousness on the validity of acoustic data is described, as well as the main behavioural features : horizontal and vertical school avoidance, acoustic shadowing, diving and dial cycles are factors to be taken into account in the acoustic methodology. Under some favourable conditions, these behavioural characteristics may help to improve the knowledge of a stock, and sometimes to identify the species. (Résumé d'auteur)
Plan de classement
Stocks [040PECHE03]
Descripteurs
RESSOURCES HALIEUTIQUES ; POISSON MARIN ; ESPECE PELAGIQUE ; DENSITE DE POPULATION ; ETHOLOGIE ; BIOMASSE ; EVALUATION ; METHODOLOGIE ; SONAR ; BANC DE POISSONS
