Crocodile tracking program to inform management

Issued: 18 Nov 2022

The movement patterns of four large estuarine crocodiles are being tracked in real time to create a detailed picture of their life, home range and territory on the Proserpine River.

Program Coordinator Dr Matt Brien said the crocodiles were captured last week in baited traps that were set on the banks of the Proserpine River.

“The crocodiles had GPS satellite telemetry devices fitted to the top of their necks, and then they were set free,” Dr Brien said.

“The trackers will remain fixed to the crocodiles for at least twelve months before dropping off, and we may attach more depending on what we will find.

“Many studies have detailed the movement patterns of larger estuarine crocodiles, and found the species is capable of travelling long distances within and between river systems.

“We want to determine if these large crocodiles leave the Proserpine River, how often, and where they go.

“Tracking the crocodiles will improve our understanding of their movement patterns, and provide important information for our management of crocodiles in the Whitsundays region.”

Program objectives include:

• Detail the movement patterns and habitat use of adult crocodiles within the Proserpine River and adjacent coastal and oceanic waters.
• Conserve and protect Queensland’s biodiversity and threatened species
• Provide leading-edge science to support the Queensland Crocodile Management Plan

Dr Brien said surveys of estuarine crocodile populations taken between 2016-2019 showed high densities of estuarine crocodiles in Queensland occur in the Proserpine River.

“It is essentially an isolated population, and based on the current density and the available habitat in the Proserpine River, we believe the estuarine population is approaching or has reached carrying capacity.

“Estuarine crocodiles are highly territorial animals, and once a population reaches carrying capacity, less dominant animals are usually forced out of the river and search for vacant territory in another river.

“To find new territory, crocodiles will use the ocean and we want to know where they go once they leave the Proserpine River.”

Remember, you are responsible for your own safety in Croc Country.

In particular:

• Expect crocodiles in ALL north Queensland waterways even if there is no warning sign
• Obey all warning signs – they are there to keep you safe
• Be aware crocs also swim in the ocean and be extra cautious around water at night
• Stay well away from croc traps – that includes fishing and boating
• The smaller the vessel the greater the risk, so avoid using canoes and kayaks
• Stand back from the water’s edge when fishing and don’t wade in to retrieve a lure
• Camp at least 50 metres from the edge of the water
• Never leave food, fish scraps or bait near water, camp site or boat ramp
• Never provoke, harass or feed crocs
• Always supervise children near the water and keep pets on a lead
• Report all croc sightings to DES by using the sighting report online, or by calling 1300 130 372.

See further information on being Crocwise.