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ECHO-TRACE [1 record]

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Record 1 2023-05-09

English

Subject field(s)
  • Collaboration with the FAO
  • Sonar and Underwater Detection (Military)
  • Acoustics (Physics)
  • Commercial Fishing
CONT

The change of density and/or activity of fish in the channel was registered by the sonar whose echo-marks exhibited two peaks at dawn and dusk. During the night[,] the density of echo-marks was stable and low in absence of the fyke-net, but it increased when the presence of the fyke-net limited the migratory flow and fish accumulated before the [fishing] gear.

Key term(s)
  • echo trace
  • echomark
  • echo mark

French

Domaine(s)
  • Collaboration avec la FAO
  • Sonar et détection sous-marine (Militaire)
  • Acoustique (Physique)
  • Pêche commerciale
CONT

La variation de densité et/ou d'activité des poissons enregistrée par le sonar (écho-traces), montre un profil nycthéméral comprenant un pic à l'aube et un autre au crépuscule. La densité nocturne d'écho-traces, relativement stable entre ces deux pics, tend à augmenter en fin de nuit lorsque le verveux barre le chenal, ralentissant ainsi le flux migratoire qui s'accumule devant l'engin [de pêche].

Spanish

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