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Shark hazard mitigation strategies.
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SMN Research Project 2009-2016
The research project used two types of acoustic receivers:
- Satellite-linked (VR4G) acoustic receivers transmit detection data via satellite before being relayed to public safety officials by the Department of Fisheries Shark Monitoring System. These receivers need fresh batteries and a major service of their buoys and moorings annually.
- Data-recording (VR2W) acoustic receivers do not transmit data but store it in the receivers’ on board memory. These receivers are recovered annually so that stored data can be downloaded and the receivers serviced. Many of these are serviced by divers however most of the receivers west of Rottnest are too deep for divers to safely access. Instead, these receivers are retrieved using electronic release mechanisms that allow them to float to the surface and be recovered.
In the Perth metropolitan area, SMN satellite-linked and data-recording acoustic receivers deployed between Warnbro Sound and Ocean Reef, include the Department of Fisheries’ Cockburn Sound acoustic receiver array, and a line of data-recording receivers managed by the Department of Fisheries on behalf of the Ocean Tracking Network.
In 2012, the network was expanded in the south west of Western Australia to include data-recording receivers installed in three lines off Hamelin Bay, Chatham Island and Bald Island. These receiver lines extended from the shore to 200m depth and were placed 800m apart, so that under most conditions they provided a continuous line of detection.
Satellite-linked receivers are located within Geographe Bay, Smiths Beach (Yallingup) and Albany.
Acoustic receivers record the shark’s ID, and the date and time of the detection. Our Tagged Shark Movement videos highlight the type of information which can be developed from the tag detection data that is collected.
The satellite-linked receivers also provide safety agencies with near real-time alerts of tagged sharks at key locations, enabling beaches to be closed. Members of the public can view this information on our Shark Activity Map.
A collaborative approach
The success of the SMN relies on a close collaboration between Department of Fisheries and CSIRO scientists, Fisheries and Marine Officers and cage-diving operators to tag white sharks in both Western and South Australia. By sharing tag ID numbers with collaborators from the CSIRO’s Wealth from Oceans Flagship and the South Australian cage-diving industry, we’re able to monitor white sharks tagged outside of Western Australia. This approach also allows other organisations to let us know when their acoustic receivers detect sharks that we’ve tagged in WA.