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Acoustic characterization of Mysis relicta at multiple frequencies

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Abstract:

We measured acoustic backscattering from Mysis relicta, a common invertebrate in northern lakes, using five frequencies (38, 120, 200, 430, and 710kHz). Acoustic backscattering from mysids was highest at 430kHz and lowest at 38kHz (19dB lower). Maximum difference between the four other frequencies was 5.2dB. Mysid target strength (TS) ranged from–80.1dB at 430kHz to–99.4dB at 38kHz (12mm average length, range 5–21mm). A theoretical scattering model (Stanton’s fluid-like, bent-cylinder model) predicted TS within 0.3–1.9dB of observed TS for the different frequencies. The detection range was lowest at 38and 710kHz and greatest at 120and 200kHz. Fish were common above the mysid layer and produced higher acoustic backscattering at 38kHz than at the other frequencies. A combination of 38kHz and 120 or 200kHz provides a strong contrast between mysid and fish acoustic backscattering that would help separate these groups using acoustic data.

Nous avons mesuré la rétrodiffusion acoustique causée par Mysis relicta, un invertébré commun dans les lacs nordiques, à cinq fréquences (38, 120, 200, 430 et 710 kHz). La rétrodiffusion acoustique par les mysidés est maximale à 430 kHz et minimale à 38 kHz (inférieure de 19 dB). La différence maximale entre les quatre autres fréquences est de 5,2dB. L’indice de cible (TS) des mysidés varie de –80,1 dB à 430 kHz à –99,4 dB à 38 kHz (longueur moyenne 12 mm, étendue 5–21 mm). Un modèle théorique de rétrodiffusion (le modèle du cylindre fluide courbe de Stanton) prédit des valeurs de TS situées entre 0,3 et 1,9 dB des TS observés aux diverses fréquences. La portée de détection est minimale à 38 kHz et 710 kHz et maximale à 120 kHz et 200 kHz. Les poissons sont communs au-dessus de la couche de mysidés et produisent une rétrodiffusion acoustique plus importante à 38 kHz qu’aux autres fréquences. Une combinaison de 38 kHz et de 120 ou 200 kHz donne un fort contraste entre la rétrodiffusion par les mysidés et par les poissons, ce qui aiderait à séparer ces groupes à l’aide de données acoustiques.

Document Type: Research Article

Publication date: December 1, 2008

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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