Authors / CoAuthors
Przeslawski, R. | Carroll, A.G.
Abstract
Offshore seismic surveys have long been considered to be disruptive to fisheries, and recent claims have been made that marine seismic operations cause scallop declines in southeastern Australia. Despite the importance of this issue to both fisheries and petroleum industries, few studies target commercially important species in realistic exposure scenarios. One of the main challenges in underwater sound impact studies is the meaningful translation of laboratory results to the field, largely due to variations due to underwater sound properties and experimental set-ups. In the current study, we use in situ experiments to investigate whether field populations of the commercial (Pectens fumatus ) and doughboy scallops (Mimachlamys asperrima) are negatively affected by a seismic survey undertaken in the Gippsland Basin in April 2015 (30 80 m depth). Both theoretical and field-based noise propagation models were developed to quantify noise exposure of the animals at the seabed and to establish whether sound monitoring markedly improves model outputs. Images of the seafloor at were acquired using an Automated Underwater Vehicle (AUV) to evaluate the novel use of AUVs in scallop stock assessment. Samples were collected before and after the seismic survey using a commercial scallop dredge, and a range of metrics are currently being quantified. In this presentation, we describe preliminary results and critically review our current understanding of low-frequency sound impact on marine molluscs.
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nonGeographicDataset
eCat Id
87806
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
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2601
Australia
Keywords
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- External Publication
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- NSW
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2015-01-01T00:00:00
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