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    Visualizing Samsonfish (Seriola hippos) with a Reson 7125 Seabat multibeam sonar

    Access Status
    Open access via publisher
    Authors
    Parsons, Miles
    Parnum, Iain
    McCauley, Robert
    Date
    2013
    Type
    Journal Article
    
    Metadata
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    Citation
    Parsons, M. and Parnum, I. and McCauley, R. 2013. Visualizing Samsonfish (Seriola hippos) with a Reson 7125 Seabat multibeam sonar. ICES Journal of Marine Science. 70 (3): pp. 665-674.
    Source Title
    ICES Journal of Marine Science
    DOI
    10.1093/icesjms/fst009
    ISSN
    10543139
    School
    Centre for Marine Science and Technology
    URI
    http://hdl.handle.net/20.500.11937/49077
    Collection
    • Curtin Research Publications
    Abstract

    In Western Australia, aggregations of Samsonfish (Seriola hippos) form each summer to spawn in waters west of Rottnest Island. In this study, a Reson 7125 Seabat multibeam sonar (400 kHz) was pole mounted aboard a 21.6 m vessel, conducting acoustic transects to acquire acoustic backscatter simultaneously from a midwater aggregation of S. hippos and the wreck it surrounded. The processedbackscatter produced high-resolution visualizations of both the fish and seabed. During a 15 min period, the centroid of the aggregation moved 91 m around the eastern and northeastern side of the wreck and probably exhibited lateral vessel avoidance behaviour from the survey vessel. Additionally, a ortheasterly current at the site was inferred from subtle habitat features, suggesting that at thetime of the survey the aggregation preferred to remain upcurrent of the wreck. These findings confirmed that the S. hippos aggregations do not necessarily remain directly above the wrecks and do not always remain sedentary. Aggregation acoustic density packing at the survey site was observed at 12.7+2.4 m3 per fish, equivalent to 1.6+0.1 body lengths nearest-neighbour distance.

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