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SMART Drumline Trial

FREQUENTLY ASKED QUESTIONS

WHAT IS A SMART DRUMLINE? 

‘SMART’ is an acronym for Shark-Management-Alert-in-Real-Time. A SMART drumline is non-lethal, and designed to send an alert when a shark has been captured on the line. Anchored to the sea floor, SMART drumlines comprise of two buoys and a satellite-linked GPS communications unit attached to a baited hook.

A triggering magnet is attached to the communications unit and the line. When a shark takes the bait and puts pressure on the line, the magnet is released. This causes the communications unit to transmit its position to the drumline operator, alerting them to the presence of an animal on the line. Once alerted, the drumline operator can immediately respond to tag, relocate and release the animal.  

The proposed locations of the non-lethal SMART drumlines in the Gracetown trial are based on a vessel attending within 30 minutes of an alert being received.  

Who will be responsible for the deployment of SMART drumlines?

The Department of Primary Industries and Regional Development (DPIRD) will be responsible for implementing the trial and managing a contractor who will operate the SMART drumlines.

The appointment of the contractor has been subject to a formal tender process in accordance with Government procurement processes.

The contractor is receiving comprehensive training, and will regularly have DPIRD staff on board the vessel to ensure compliance with fishing and shark handling guidelines.

How often will SMART drumlines be deployed?

Weather permitting, SMART drumlines will be deployed and retrieved each day. It will be the responsibility of the contractor to stay in the vicinity of the drumlines, providing the capacity for an immediate response once alerted to the presence of a shark on the line.

What are the objectives of the trial?

The Western Australian trial will gather tagged shark movement data which will be assessed to determine whether SMART drumlines reduce the risk of shark interactions in local conditions.

The target species for the trial is white sharks, as all fatal and serious shark bites since 2000 in Western Australia have been attributable to white sharks.

After 12 months, the Chief Scientist, Professor Peter Klinken AC, will undertake an independent assessment on the effectiveness of SMART drumlines in reducing the risk of shark attacks. The Chief Scientist’s report will assist government in making a science-based assessment of the potential application of SMART drumlines in Western Australia.

What tags will be used as part of the trial?

All sharks caught during the trial will receive an identification tag for easy physical identification, to determine if the shark has been caught as part of the trial.

White sharks will also receive:

  • An external acoustic tag to allow monitoring by satellite-linked receivers as part of the Shark Monitoring Network and data recording receivers deployed for the term of the trial.
  • pop-up satellite archival tag to collect water depth, temperature and broad scale location data.

Why are we using pop-up satellite archival tags?

Pop-up satellite archival tags (PSATs) consists of various sensors, a data recorder, a programmable, automatic release mechanism and a transmitter for data retrieval via satellite. PSATs are positively buoyant and float to the surface at a pre-determined release time (usually after a few months) and data is then transmitted to a satellite.

PSATs collect data on time of day, light levels, temperature and water depth. This data enables scientists to broadly estimate the shark’s movements from the time a shark is tagged, to the time the tag releases from the shark. The PSATs for this study also use an accelerometer to detect if a tagged shark keeps swimming after release and so will be used to estimate survival rates following tagging, a critical aspect of the trial. The PSATs also monitor for constant depth, a state which implies the tag is floating at the surface or sitting on the sea floor. If constant-depth is met the tag will release, indicating animal mortality and transmit its data summaries.

PSATs are not designed or intended to provide a real-time satellite-track of a shark. Tags that use satellites to track location cannot reliably provide the level of accuracy required for fine-scale tracking and only transmit locations when the shark’s dorsal fin breaks the surface. Such tags would not provide information relevant to the design of the trial.

How far offshore will sharks be released?

Where possible all white sharks and tiger sharks three metres or greater in length will be relocated about one kilometre offshore. While every attempt will be made to relocate those sharks, weather conditions may impact the ability to relocate the shark safely. 

How will tagged shark movements be monitored?

Shark movements will be monitored via data-recording receivers on the sea-bed around the perimeter of the trial area. They store data in the on board memory and will be retrieved and information downloaded for the Chief Scientist’s independent assessment.

In addition, white sharks will be tagged with an acoustic tag which can be detected by one of the satellite-linked receivers which make up the Shark Monitoring Network.

The Shark Monitoring Network will provide ocean users and land managers with near real-time alerts of tagged sharks. The information is also posted to the SharkSmart Activity Map and Surf Life Saving WA Twitter feed.

Pop-up satellite archival tags will also be used to collect broad scale movement data.

How will I know if a shark has been captured on a SMART drumline?

Information regarding sharks caught and released will be made publicly available. Beach users are encouraged to check the SharkSmart Activity Map and Surf Life Saving WA Twitter feed for up to date shark captures, as well as tagged shark detections and reported shark sightings.

What makes the SMART drumline trial different to the 2014 drumline trial?

Between January and April 2014, the former government trialled the use of traditional drumlines, which consisted of a baited hook suspended from buoys, anchored to the ocean floor.

The lethal 2014 trial was designed to kill target shark species caught on the line.  

The planned non-lethal SMART drumline trial will be designed as a catch, tag, relocate and release program of target species.

How does the SMART drumline project work with major events in the region?

DPIRD regularly meets and communicates with key stakeholders in the region, including managers for major events such as the Margaret River Pro, Surf Life Saving WA, the Department of Biodiversity, Conservation and Attractions (DBCA) and the main surfing groups.

Does the SMART drumline project have environmental and animal welfare approvals?

The trial was referred to the Environmental Protection Authority and it was determined that the trial did not require formal assessment. This was primarily due to the localised impact of the trial, protocols in place and close monitoring. The trial was also approved by DPIRD’s independent Animal Ethics Committee.

Environmental groups such as Sea Shepherd and the Conservation Council of WA are actively engaged in the project and are represented on the Ministerial Reference Group. The Group has endorsed the operating protocols, which includes guidelines on handling animals, releasing sharks and euthanizing animals, if required.

What measures are in place to protect by-catch species?

SMART drumline project managers and DPIRD technical staff have worked with animal welfare groups and associated Government agencies, such as DBCA, to minimise risks to any by-catch.

Measures include specially designed fishing gear to reduce the likelihood of whale entanglement, hook type, regular monitoring of the SMART drumlines and an immediate response to alerts with contractor to be at the drumline within 30-minutes.

How will the SMART drumline project be monitored to ensure sharks are treated humanely?

The SMART drumline contractor was identified through a rigorous evaluation process to ensure they had the skills, experience, vessel and capacity to carry out the trial.

As this is a scientific trial, the contractor is undertaking a detailed training program to ensure they are familiar with the science-based tagging and reporting processes. DPIRD technical observers will be on board the contractor’s vessel for at least the first 30 days of the trial and approximately 50 per cent of the time for the remainder of the trial.

Independent observers, nominated through the Ministerial Reference Group, will also have opportunities to observe capture, tagging and relocation operations.

What happens if a shark dies on a SMART drumline?

DPIRD has made all efforts to prevent any death or injury to sharks and other marine animals. If any such event occurs, the contractor is well trained to treat all animals humanely, including euthanasia, if required. If there are any mortalities of white sharks or other listed species, DPIRD may suspend operations to investigate the incident and consult with the Ministerial Reference Group.

Is there an exclusion zone around the trial?

There is a 100-metre exclusion zone around every SMART drumline and the contractor’s vessel. Anyone found to be breaching the exclusion zone or interfering with the SMART drumline equipment or baits is liable to prosecution. DBCA has restrictions on the use of drones within the Ngari Capes Marine Park, which encompasses the trial area. Refer to the DBCA website for further information: www.dbca.wa.gov.au/management/remotely-piloted-aircraft

 

Download a copy of the Scientific non-lethal SMART drumline trial fact sheet here 

 

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