Cristin-resultat-ID: 1259899
Sist endret: 23. november 2015, 09:46
Resultat
Faglig foredrag
2015

School biomass estimates using digital omnidirectional fisheries sonar

Bidragsytere:
  • Hector Pena
  • Egil Ona
  • Gavin Macaulay
  • Arne Johannes Holmin
  • Sindre Nordlund Vatnehol og
  • Ole Bernt Gamelsæter

Presentasjon

Navn på arrangementet: ICES Symposium on “Marine Ecosystem Acoustics - observing the ocean interior in support of integrated management”
Sted: Nantes
Dato fra: 25. mai 2015
Dato til: 28. mai 2015

Arrangør:

Arrangørnavn: ICES

Om resultatet

Faglig foredrag
Publiseringsår: 2015

Beskrivelse Beskrivelse

Tittel

School biomass estimates using digital omnidirectional fisheries sonar

Sammendrag

Low frequency (26 - 30 kHz) omnidirectional fisheries sonars (Simrad SX90 and SU90) were used to measure the acoustic backscatter and dimensions of herring (Clupea harengus) and mackerel (Scomber scombrus) schools from fishing vessels between 2012 and 2014. Detailed sonar sampling of each school included operations at slow vessel speeds and fixed distances to the school, similar to pre-catch school inspection procedures during commercial fishing. Calibrated digital sonar data were processed using new school segmentation procedures, including school area correction procedures. Data on segmented schools from horizontal and vertical sonar beams were used to compute school volume and mean acoustic backscattering strength (Sv). Using mean lateral target strength estimates and fish length and weight, individual school biomass estimates were derived. Biomass estimates were compared with purse seine catches of the same schools, and the accuracy of the estimates assessed in relation to the significant parameters used.

Bidragsytere

Hector Pena

  • Tilknyttet:
    Forfatter
    ved Økosystemakustikk ved Havforskningsinstituttet

Egil Ona

  • Tilknyttet:
    Forfatter
    ved Institutt for biovitenskap (BIO) ved Universitetet i Bergen

Gavin John Macaulay

Bidragsyterens navn vises på dette resultatet som Gavin Macaulay
  • Tilknyttet:
    Forfatter
    ved Økosystemakustikk ved Havforskningsinstituttet

Arne Johannes Holmin

  • Tilknyttet:
    Forfatter

Sindre Nordlund Vatnehol

  • Tilknyttet:
    Forfatter
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