@article{fdi:010082081,
  title = {{Q}uantifying the increase in fishing efficiency due to the use of drifting {FAD}s equipped with echosounders in tropical tuna purse seine fisheries},
  author = {{W}ain, {G}wenaelle and {G}uery, {L}. and {K}aplan, {D}avid and {G}aertner, {D}aniel},
  editor = {},
  language = {{ENG}},
  abstract = {{N}umerous pelagic species are known to associate with floating objects ({FOB}s), including tropical tunas. {P}urse seiners use this behaviour to facilitate the capture of tropical tunas by deploying artificial drifting fish aggregating devices (d{FAD}s). {O}ne major recent change has been the integration of echosounders in satellite-tracked {GPS} buoys attached to {FOB}s, allowing fishers to remotely estimate fishable biomass. {U}nderstanding the effects of this new technology on catch of the three main tuna species (yellowfin tuna, {T}hunnus albacares; bigeye tuna, {T}hunnus obelus; and skipjack tuna, {K}atsuwonus pelamis) is important to accurately correct for this change in catch-per-unit-effort ({CPUE}) indices used for stock assessments. {W}e analysed catch data from the {F}rench purse seine fleet for the period 2010-2017 in the {I}ndian {O}cean to assess the impact of this fleet's switch to echosounder buoys around 2012. {R}esults indicate that echosounders do not increase the probability a set will be succesful, but they have a positive effect on catch per set, with catches on average increasing by approximate to 2 - 2.5 tonnes per set (approximate to 10%) when made on the vessel's own d{FAD}s equipped with an echosounder buoy. {I}ncreases were due to a decrease in sets below approximate to 25 tonnes and an increase in those greater than approximate to 25 tonnes, with a non-linear transition around this threshold. {T}his increase explains the considerable investment of purse seiners in echosounder buoys, but also raises concerns about bias in stock size estimates based on {CPUE} if we do not correct for this fishing efficiency increase.},
  keywords = {catch per unit effort ; hyperstability ; {I}ndian {O}cean ; standardization ; {OCEAN} {INDIEN}},
  booktitle = {},
  journal = {{ICES} {J}ournal of {M}arine {S}cience},
  volume = {78},
  numero = {1},
  pages = {235--245},
  ISSN = {1054-3139},
  year = {2021},
  DOI = {10.1093/icesjms/fsaa216},
  URL = {https://www.documentation.ird.fr/hor/fdi:010082081},
}