@incollection{fdi:010017258,
  title = {{P}redators and preys : an acoustic approach},
  author = {{M}archal, {E}mile and {J}osse, {E}rwan and {L}ebourges, {A}nne},
  editor = {},
  language = {{ENG}},
  abstract = {{P}redators seek congregated rather than scattered prey, and school themselves most of the time. {I}n order to study the relationship between predators and preys, one needs to identify them. {C}lassical methods of investigation, such as the use of different kinds of net (plankton, midwater trawl) with a regular sampling grid, often fail to succeed in catching them, due to their very heterogeneous distribution. {I}n contrast, acoustics allows us to "see" and to study them, thanks to the very good transmission of sound in the water. {A} good example of the way acoustics could be used to study predator-prey relationships is provided by a tuna fishery in the {E}quatorial {A}tlantic which exploits a seasonal tuna concentration. {I}t was assumed that tuna find here abundant food, supported by the very high percentage of a mesopelagic fish, #{V}inciguerria nimbaria$, found in their stomach contents. {H}owever, this fish is known as a dial migrator, diving to deep waters during the daytime, where tuna could not catch them since they are view-feeders. {A}coustic detection has proven that, in this case, this small fish could stay in the surface layers, aggregating in small schools at the thermocline level. {I}n addition, acoustic tagging has shown that tuna were staying most of the time at this particular level. {F}inally, acoustic estimation of the packing density and the volume of these schools allows us to assume their actual role in the daily feeding of tuna. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{POISSON} {MARIN} ; {THON} ; {PREDATEUR} ; {RELATION} {PREDATEUR} {PROIE} ; {ETHOLOGIE} ; {ABONDANCE} ; {EVALUATION} ; {PROSPECTION} {ACOUSTIQUE}},
  booktitle = {{P}roceedings of acoustics seminar {AKUSTIKAN} 2},
  numero = {},
  pages = {253--264},
  address = {{L}uxembourg ({LUX}) ; {J}akarta ({IDN}) ; {P}aris},
  publisher = {{U}nion {E}urop{\'e}enne ; {CRIFI} ; {ORSTOM}},
  series = {},
  year = {1997},
  ISBN = {979-8186-64-8},
  URL = {https://www.documentation.ird.fr/hor/fdi:010017258},
}