@inproceedings{fdi:38977, title = {{V}ariability of {H}arengula spp. school reactions to boats or predators in shallow water}, author = {{F}r{\'e}on, {P}ierre and {G}erlotto, {F}ran{\c{c}}ois and {S}oria, {M}arc}, editor = {}, language = {{ENG}}, abstract = {{T}he internal structure and behaviour of clupeid schools has been observed #in situ$ during unstressed period followed either by natural predation or by applying a controlled stress (a realistically painted model predator). {C}ombined acoustic and visual (aerial and underwater) observation techniques were used. #{I}n situ$ observations are characterized by a high variability of fish reactions in space and time. {T}he variability in space obviously due to the large scale of observation which allows the silmutaneaous occurence of different types of behaviour in different regions. {T}he variability in time is probably due to a large number of physiological or environmental influences changing unexpectedly between repeated experiments. {T}he variability of fish reaction depends on the characteristics of the source of the stimuli : some sources (e.g. predators) induce different behavioural patterns according to the number of stimuli; others (e.g. boats) induce a single patterns, varying only in intensity. {C}onsequences for acoustic signal identification are discussed. ({R}{\'e}sum{\'e} d'auteur)}, keywords = {{POISSON} {MARIN} ; {ESPECE} {PELAGIQUE} ; {ETHOLOGIE} ; {SCHOOLING} ; {EXPERIMENTATION} ; {ECHOINTEGRATION} ; {ANALYSE} {DE} {DONNEES} ; {STIMULUS} {ARTIFICIEL} ; {MARTINIQUE} ; {MER} {DES} {ANTILLES}}, volume = {196}, numero = {}, pages = {30--35}, booktitle = {{F}ish behaviour in relation to fishing operations}, year = {1993}, URL = {https://www.documentation.ird.fr/hor/fdi:38977}, }