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Development of New Methods for Quantifying Fish Density Using Underwater Stereo-video Tools
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Detecting Atlantic herring by parametric sonar.

Olav Rune Godo1, Kenneth G Foote, Johnny Dybedal

  • 1Institute of Marine Research, P.O. Box 1870 Nordnes, 5817 Bergen, Norway. olavrune@imr.no

The Journal of the Acoustical Society of America
|April 8, 2010
PubMed
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Kongsberg TOPAS sonar effectively observed Atlantic herring, showing agreement with scientific echo sounders and providing insights into fish behavior. Further progress is being made to quantify these sonar observations.

Area of Science:

  • Marine acoustics
  • Fisheries acoustics
  • Sonar technology

Background:

  • Atlantic herring (Clupea harengus) are a commercially important species.
  • Sub-bottom profiling sonar offers potential for observing marine life.
  • Accurate acoustic data is crucial for fisheries management.

Purpose of the Study:

  • To evaluate the utility of the Kongsberg TOPAS PS18 parametric sub-bottom profiling sonar for observing Atlantic herring.
  • To compare TOPAS echograms with data from scientific echo sounders.
  • To investigate herring avoidance behavior in response to survey vessels.

Main Methods:

  • Utilized the Kongsberg TOPAS PS18 parametric sub-bottom profiling sonar (1-6 kHz).
  • Collected in situ data on herring layers and schools in December 2008 and November 2009.

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  • Simultaneously acquired data using a Simrad EK60 scientific echo sounder (18- and 38-kHz).
  • Analyzed TOPAS echograms and compared them with volume backscattering strength data.

    • Main Results:

    • Representative TOPAS echograms of herring were presented.
    • TOPAS echograms showed good agreement with scientific echo sounder data.
    • Observations provided insights into herring avoidance behavior during vessel transits.
    • Progress in quantitative analysis of TOPAS echograms was described.

    Conclusions:

    • The TOPAS PS18 sonar is a viable tool for observing Atlantic herring.
    • Dual-frequency echo sounder data complements TOPAS observations.
    • Understanding herring behavior is essential for effective acoustic surveys.