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Gnargoo - Western Australian Loggerheads - Gnaraloo Bay and Gnaraloo Cape Farquhar 2015-2018

A project of Gnaraloo Wilderness Foundation.

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"Gnargoo" is named after the nearby possible 75 km-diameter post-Early Permian - pre-Cretaceous buried asteroid impact structure. (Up to 250 million years old)

1) Gnargoo was found in the Gnaraloo Bay BP8-BP9 sector on the night of 7th December, and after laying her eggs and filling in her nesting chamber, was restrained with the portable turtle box being assembled around her. She measured 92.0 cm.
She was given:
Front Left flipper tag - WB15138
Front Right flipper tag - WB15139
Carapace Rear - the letter "A"
Carapace Front - Wildlife Computers "SPOT 6" ARGOS satellite tracker ID number 158486
Skin Biopsy No. F6467 was collected for later DNA and Stable Isotope analysis by the WA DBCA Marine Science division.

The day after release she left her Gnaraloo Bay nesting beach and moved 20 km north to inside the reef adjacent to the Gnaraloo Cape Farquhar nesting beach.

She remained around here until the night of 22nd December when she returned to near her first nest site at Gnaraloo Bay, in preparation for re-nesting.

2) She was on the beach nesting between on the night of 23rd December - 2:30am and 4:20am on 24th, at Gnaraloo Bay 80 meters from her first nest site, and after nesting swam north and had returned to inside the reef at the Cape Farquhar Bay by 14:48pm Christmas Eve 24th December 2017.

The 7th to the 23rd December was a 16 day re-nesting interval.

3) She returned south to Gnaraloo Bay during the day of 6th January 2018, and attempted to nest that night, and again on the night of 7th January, when she was successful, and immediately headed north to the inside the reef at Cape Farquhar Bay on the morning of the 8th January.

This was 14 days to the nesting attempt and 15 days to the successful re-nesting.

4) She returned south to Gnaraloo Bay during the day of 21st January 2018, and nested that night.

This was a 14 day inter-nesting interval.

Immediately after nesting, during the 22nd of January she swam northwards 5km wide of her previous inter-nesting refuge inside the reef at Cape Farquhar Bay, and commenced her homeward migration.

By 16:00hrs on 24th January she was 8m offshore, 90km north of Gnaraloo Bay, and halfway between Coral Bay and Ningaloo
By 17:00hrs on 25th January she had moved a further 50km north and was offshore of Lefroy Bay.

She stayed within 10km of the coast on her way north, and then after passing Exmouth on the 27th January has traveled north east, staying about 100km off the NW Western Australian coast.

Before sunrise on 9th March she crossed latitude 129E degrees leaving Western Australian and entering Northern Territory waters and was heading towards Beagle Bay and Darwin.

  • The presentation of data here does not constitute publication. All data remain copyright of the project partners. Maps or data on this website may not be used or referenced without the explicit written consent of the data owners.
  • For more information please visit the project website.
  • This map connects positions generated by the ARGOS system designated as location class (lc) '4', '3', '2', '1', '0'. Locations that have been "filtered" are displayed as small red dots.
  • This maps also shows locations of class 'A', 'B' as small black dots which are not connected by a route line.
  • Bathymetry layers are derived from the GEBCO One Minute Grid.
  • Sea surface temperature and chlorophyll are derived from NASA's Ocean Color data.
  • Ocean currents and sea surface heights are derived from AVISO's Ssalto/Duacs Gridded Absolute Dynamic Topography & absolute geostrophic velocities data.

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