@article{fdi:010065929,
  title = {{S}patiotemporal distribution of fish schools around drifting fish aggregating devices},
  author = {{T}rygonis, {V}. and {G}eorgakarakos, {S}. and {D}agorn, {L}aurent and {B}rehmer, {P}atrice},
  editor = {},
  language = {{ENG}},
  abstract = {{O}mnidirectional sonar surveys were conducted in close proximity to drifting fish aggregating devices ({FAD}s) offshore {S}eychelles, western {I}ndian {O}cean, to investigate the number, size, and distribution of {FAD}-associated fish schools. {E}chotrace detection techniques applied on the raw multibeam data enabled the extraction of empirical statistics regarding inter-school distances, and allowed the visualization of the temporal evolution of the pelagic aggregation on a {FAD}-centered coordinate system. {T}he sonar recordings revealed the concurrent existence of multiple fish schools that were spatially clustered and exhibited low permanence in size and structure. {S}chools were predominantly detected within a radius of 500 m from the {FAD}s, although 15% of detections occurred between 500 to 1500 m from the floating devices. {F}ish school biomass detected with the sonar was aggregated into a few, large schools during daytime, and dispersed into a larger number of small schools during nighttime. {C}ompared to daytime observations, nighttime schools maintained smaller inter-school distances and were located closer to the drifting {FAD}s. {T}he study demonstrates that horizontal sonars are powerful tools for studying the spatiotemproral distribution of large pelagic schools in the vicinity of drifting {FAD}s.},
  keywords = {{SEYCHELLES} ; {OCEAN} {INDIEN}},
  booktitle = {},
  journal = {{F}isheries {R}esearch},
  volume = {177},
  numero = {},
  pages = {39--49},
  ISSN = {0165-7836},
  year = {2016},
  DOI = {10.1016/j.fishres.2016.01.013},
  URL = {https://www.documentation.ird.fr/hor/fdi:010065929},
}