Fréon Pierre auteur aut IRD Gerlotto François auteur aut IRD text conferencePaper eng text/pdf reformatted digital access A new methodolgy is proposed for studying fish school behaviour, allowing to quantify its influence on stock abundance estimations. Observations are collected in open sea or inside a large net set in shallow waters. Preliminary results concerning fish reactions show a modification of the school structure under a research vessel using acoustic devices for abundance measurements. The school structure, even when the fish is not disturbed, shows an irregular density distribution in opposition to the common belief. (Résumé d'auteur) specialized POISSON ETHOLOGIE STRUCTURE DE POPULATION ESTIMATION DE STOCK BANC 040PECHE03 Fish Capture Committee Working Group Meetings : Fisheries Acoustic Science and Technology Session, 2., Ostende (BEL), 1988/04/18-22 7 multigr. Copenhague ICES 1988 https://www.documentation.ird.fr/hor/fdi:26665 [F B26665] https://www.documentation.ird.fr/hor/fdi:26665 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_5/b_fdi_20-21/26665.pdf IRD - Base Horizon / Pleins textes 1989-09-05 2006-05-24 fdi:26665 fre