Wolf Rock research project
Wolf Rock, near Double Island Point in Queensland, is a protected grey nurse shark aggregation site.
Background
Wolf Rock, near Double Island Point, in Great Sandy Marine Park one of the most dived grey nurse shark aggregation sites in Queensland. Many people want a ‘diving-with-sharks’ experience.
© Amanda Delaforce.
Range testing equipment deployed as can be seen with the buoy in the foreground.
© Carley Kilpatrick.
Grey nurse sharks at depth around Wolf Rock, near Double Island Point, Queensland.
Wolf Rock in detail
© Carley Kilpatrick.
Pregnant female grey nurse sharks at boulder country around Wolf Rock.
Wolf Rock, is currently the only known gestation site for the east coast population of grey nurse sharks. Mature females stay here for 9–12 months before heading south to central and southern New South Wales waters to pup and rest for 1 to 2 years.
© University of Queensland with permission.
Wolf Rock bathymetry (underwater mapping) (view larger image).
Wolf Rock currently has one permit holder (historical use) accessing this site on a commercial basis, which provides for 10 plus 2 divers with one vessel (as per legislation). Additional commercial marine park permits have been approved with specific conditions pending the outcomes of the research. The current use of Wolf Rock by these operators is expected to be very low, in terms of days per year. However, the scenario of large numbers of divers in the water for a large proportion of daylight hours during good weather, with up to four operators, not including dive clubs, who are known to dive here, certainly has the potential to disturb, and possibly displace, these gestating sharks to locations where their key threatening process (fishing) is allowed.
Research methodology for Wolf Rock
- Record water (and dive) conditions.
- Analyse monthly commercial operator and club returns.
- Undertake diver and shark number counts.
- Undertake photo identification of grey nurse sharks.
- Carry out acoustic monitoring or grey nurse shark and diver movements.
Acoustic monitoring comprises of five distinct components done in these stages:
Stage 1: range testing of acoustic monitoring equipment
Stage 2: deployment of acoustic monitoring equipment
Stage 3 acoustic tagging of grey nurse sharks and dive leaders (on their buoyancy control device ) to simultaneously track diver and shark movements
Stage 4: equipment retrieval:
- outer boundary receiver array
- VPS receiver inner array around Wolf Rock
- Pinnacles and Round Rock receivers
Stage 5: Data analysis and reporting
- data analysis and reporting—final stage. In progress expected completion mid-2018.
Stage 1: Range testing of acoustic monitoring equipment
QPWS marine park vessel, CH Thompson, heading out to Wolf Rock for range testing of equipment.
QPWS Rangers standing by for deployment of ropes, chains, floats, 'sync tags' and receivers.
QPWS Rangers setting up the equipment for smooth deployment at Wolf Rock site.
Range testing of receivers and equipment underway at Wolf Rock site, with Rainbow Beach coloured sands in the background.
Stage 2: Deployment of acoustic monitoring equipment at Wolf Rock
Cement blocks and receivers ready to be deployed at Wolf Rock.
Using the barge and crane to do the heavy lifting at Wolf Rock.
Stage 3: Acoustic tagging of grey nurse sharks
Grey nurse sharks are externally tagged at Wolf Rock and dive leaders attach a tag to their BCDs so we can simultaneously track diver and shark movements.
© Amanda Delaforce.
Researchers also collected genetic samples of the grey nurse sharks in the Wolf Rock area.
Securing the acoustic tag to the Hawaiian Sling (tagging device).
Looking for a suitable shark to tag with the Hawaiian Sling ready.
Diver swimming past the receiver.
Stage 4: Equipment retrieval
- outer boundary receiver array
- VPS receiver inner array around Wolf Rock
- Pinnacles and Round Rock receivers
Stage 5: Data analysis and reporting
- data analysis and reporting—in progress, expected completion mid-2018.
© Amanda Delaforce.
QPWS marine park’s barge used to retrieve sub-sonic releases from the ocean.