@inproceedings{fdi:010063302,
  title = {{H}ow many {F}ish {A}ggregating {D}evices are currently drifting in the {I}ndian {O}cean ? {C}ombining sources of information to provide a reliable estimate},
  author = {{M}aufroy, {A}. and {B}ez, {N}icolas and {K}aplan, {D}avid and {D}elgado de {M}olina, {A}. and {M}urua, {H}. and {C}hassot, {E}mmanuel},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ince the mid 1990s, drifting {F}ish {A}ggregating {D}evices (d{FADS}), artificial objects specifically designed to aggregate fish, have become an important mean of catching tropical tunas in the {I}ndian {O}cean for the purse seine fleet. {I}n recent years, the massive deployments of d{FAD}s as well as the massive use of tracking {GPS} and echosounder buoys on d{FAD}s and natural floating objects (logs) have raised serious concerns for tropical tuna stocks but also regarding the possible modifications in ecosystem functioning. {H}owever, relatively little remains known on the modalities of d{FAD} and tracking buoy use by purse seiners. {T}hese knowledge gaps render difficult the evaluation of the impacts of fishing practices with d{FAD}s and logs. {F}or the first time, the three {F}rench fishing companies operating or having operated in the {I}ndian {O}cean provided the {GPS} buoy tracks of a large proportion of the d{FAD}s and logs monitored by the {F}rench fleet. {H}ere, we combine this new source of information with observations of d{FAD}s and logs by observers aboard {F}rench and {S}panish purse seiners, quarterly {F}rench fishing companies orders of buoys, and interviews with purse seine skippers conducted in the port of {V}ictoria. {T}his allows us to identify 4 d{FAD} and log seasons, to understand the strategies of fishers regarding d{FAD} and tracking {GPS} buoy deployment, to extrapolate the total number of d{FAD}s and {GPS} buoys used by all purse seine fleets and to examine some of the impacts of d{FAD} use in the {I}ndian {O}cean. {T}he results we obtain are a first step for a better assessment and management of the purse seine d{FAD} fishery.},
  keywords = {{PECHE} {THONIERE} ; {TECHNIQUE} {DE} {PECHE} ; {DISPOSITIF} {DE} {CONCENTRATION} {DES} {POISSONS} ; {SENNE} ; {EFFORT} {DE} {PECHE} ; {VARIATION} {PLURIANNUELLE} ; {VARIATION} {MENSUELLE} ; {STRATEGIE} {DE} {PECHE} ; {ETUDE} {D}'{IMPACT} ; {OCEAN} {INDIEN}},
  numero = {{IOTC}-2014-{WPTT}16-21},
  pages = {25},
  booktitle = {16{\`e}me groupe de travail sur les thons tropicaux},
  year = {2014},
  URL = {https://www.documentation.ird.fr/hor/fdi:010063302},
}