@article{fdi:010069429,
  title = {{D}iel behaviour of tuna and non-tuna species at drifting fish aggregating devices ({DFAD}s) in the {W}estern {I}ndian {O}cean, determined by fishers' echo-sounder buoys},
  author = {{L}opez, {J}. and {M}oreno, {G}. and {I}baibarriaga, {L}. and {D}agorn, {L}aurent},
  editor = {},
  language = {{ENG}},
  abstract = {{A}s tropical pelagic species are attracted by floating objects in the surface of the ocean, industrial purse seiners deploy thousands of man-made drifting fish aggregating devices ({DFAD}s) to facilitate their catch of tunas. {H}owever, the sharp increase in the use of {DFAD}s leads to some ecological concerns, such as producing higher amount of by-catch or alteration of natural behaviour of fish. {W}e used fishers ' satellite-linked {GPS} buoys equipped with echo-sounders to continuously collect acoustic samples under remote {DFAD}s and investigate the diel behaviour patterns of the associated fish (i.e., non-tuna species and small and large tunas) and their potential biological interactions. {R}esults showed a strong correlation between the presence of non-tuna species and small tunas, and between small and large tunas. {D}iel biomass dynamics were highly variable and seem to be both species and regionspecific, which may suggest adaptive behaviour patterns. {T}una associated with {DFAD}s in the {S}omalia area showed a clear night-time associative behaviour. {I}n contrast, tuna in the {NW} {S}eychelles associated with {DFAD}s to a greater degree during daytime. {I}n the {M}ozambique {C}hannel, large tuna showed daytime associative behaviour, while small tuna showed a maximum biomassat sunrise, decreasing over the day. {T}he associative behaviour of non-tuna species was slightly variable, being uniform near the equator or showing two peaks when increasing latitude. {T}his study shows the importance and effect of biological factors on the associative behaviour of the fish and serves as a first step towards improving pre-set selectivity of purse seine fisheries using {DFAD}s. {T}he fish presence and density may improve {DFAD} attraction and detectability and the observed periodicity by species and area shows both similarities and differences with published literature.},
  keywords = {{T}una ; {B}ehaviour ; {E}cho-sounder buoys ; {B}y-catch ; {P}urse seiners ; {FAD} ; {M}ulti-species aggregations ; {OCEAN} {INDIEN}},
  booktitle = {},
  journal = {{M}arine {B}iology},
  volume = {164},
  numero = {3},
  pages = {art. 44 [16 p.]},
  ISSN = {0025-3162},
  year = {2017},
  DOI = {10.1007/s00227-017-3075-3},
  URL = {https://www.documentation.ird.fr/hor/fdi:010069429},
}