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    Target strengths of krill at 136 and 20 kHz

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    Numéro du document:
    WG-KRILL-91/29
    Auteur(s):
    S.M. Kasatkina (USSR)
    Point(s) de l'ordre du jour
    Résumé

    Estimation of krill target strength was made by ensonification of encaged live krill and using trawling-acoustic method . Ensonification of encaged live krill. For aggregations with mean lengths in the range (45,50) mm the mean single-krill target strengths are in the range (-68, -69) dB at 136 kHz. For aggregations with mean lengths in the range (43,47)mm the mean single-krill target strengths are in the range (-71, -77) dB at 20 kHz.
    Trawling-acoustic method. For aggregations with mean lengths in the range (47,50) mm the mean target strengths in the range ( -71, -75) dB at 20 kHz were obtained. At the same frequency for aggregations with mean lengths in the range (41,47) mm the mean single-krill target strengths are in the range (-76, -81) dB.

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