@article{fdi:010051173,
  title = {{E}ffects of in situ radiated noise of the platform used on shallow water area on echo sounder data in fisheries acoustics},
  author = {{B}rehmer, {P}atrice and {G}uennegan, {Y}. and {A}rzelies, {P}. and {G}uillard, {J}. and {C}heret, {I}. and {D}uformentelle, {P}. and {C}olon, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he shallow water area of the coastal fringes is important to take into consideration in fish stock assessment because a great part of the stock, especially for the small pelagic fish is distributed in this area (20). {I}n shallow water research vessels are prohibited to navigation (usually <20m)  and usually only small boats can be used. {O}ne of the main source error in acoustics fish sampling is due to the avoidance reaction generated by the three dimensional noise diagram emitted by the boat.  {I}n this paper we highlighted the importance of wind direction and strength in the noise diagram emitted by the boat under in situ condition. {A} comparison of the noise level of two boats (a {R}esearch {V}essel and a {S}peedboat equipped of similar echo sounder) has been made before simultaneous records of echo sounder data: the speedboat is more silent as revealed by in situ hydrophone measurement and near the {ICES} recommendations. {T}he observation of shoal echo sounder descriptors shows an avoidance reaction as expected more important for the noisier boat: there the schools avoid more the research vessel. {T}he avoidance reaction is characterised by a deeper position of the fish school barycentre, in the water column, detected by the research vessel and a shoal minimum depth higher than for the speedboat. {T}he effect of noise diagram difference is clear on the same shoal descriptors, the difference appears for the vertical position of the barycentre and minimum altitude.},
  keywords = {{POISSON} {MARIN} ; {ESPECE} {PELAGIQUE} ; {ESTIMATION} {DE} {STOCK} ; {PROSPECTION} {ACOUSTIQUE} ; {ECHOINTEGRATION} ; {ANALYSE} {SPECTRALE}},
  booktitle = {},
  journal = {{H}ydroacoustics},
  volume = {6},
  numero = {},
  pages = {31--40},
  year = {2003},
  URL = {https://www.documentation.ird.fr/hor/fdi:010051173},
}