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    Monitoring demersal scalefish populations in the Browse Basin region: accounting for spatial variability and detecting change in key fish populations

    Access Status
    Fulltext not available
    Authors
    Babcock, R.
    Lawrence, E.
    van der Velde, T.
    Pitcher, C.
    Tonks, M.
    Bessey, C.
    Harvey, Euan
    Newman, Stephen
    Date
    2017
    Type
    Conference Paper
    
    Metadata
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    Citation
    Babcock, R. and Lawrence, E. and van der Velde, T. and Pitcher, C. and Tonks, M. and Bessey, C. and Harvey, E. et al. 2017. Monitoring demersal scalefish populations in the Browse Basin region: accounting for spatial variability and detecting change in key fish populations, APPEA 2017 Conference and Exhibition.
    Source Title
    The APPEA Journal
    Source Conference
    APPEA 2017 Conference and Exhibition
    DOI
    10.1071/AJ16251
    ISSN
    1326-4966
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/53550
    Collection
    • Curtin Research Publications
    Abstract

    One of the objectives of the Applied Research Program (ARP), funded by Shell and the INPEX-operated Ichthys LNG Project, was to establish the basis for evaluating the effects of any potential oil spill from the Prelude or Ichthys fields on populations of commercially important demersal fishes in the Northern Demersal Scalefish Managed Fishery. The ARP has delivered improved baseline understanding of the status and spatial variability in populations of commercially and ecologically important finfish of the Browse Basin region, in the vicinity of the Prelude and Ichthys fields, using both commercial-style fish traps and baited remote underwater videos (BRUVs) as sampling methods. We used available environmental-data layers and fish-distribution data, in combination with modelled plume projections, to design a study such that sites were balanced with respect to fish habitat and likely affected and unaffected zones. The sampling-design employed was statistically effective with power to show changes in fish assemblages, and relative abundance of as little as 30% could be detected with 80% certainty in the main commercial species, goldband snapper (Pristipomoides multidens), using BRUVs. For the second-most important species, red emperor (Lutjanus sebae), a larger decline of 50% would have to occur for this change to be determined with the same level of confidence. Traps were a more powerful tool for sampling L. sebae, allowing a 40% change to be detected; however, for all other species BRUVs were more powerful. Sampling of the demersal-fish assemblages surrounding the Prelude and Ichthys fields by using both fish traps and BRUVs demonstrated the feasibility of detecting change in the relative abundance of the fish assemblage as well as in the key commercial species.

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