Abantiades https://bold-au.hobern.net/taxon.php?taxid=2615 of the species recorded in WA, A. albofasciatus is the best fit. It looks like Abantiades sp on BOLD have undergone a lot of re-sorting lately.
Hello Vik. We usually require a photo, but foxes are easy to ID. However, the location is in a lake. Can you please correct the location .. click on the Edit button and adjust by clicking on the map. Place a comment below when you have done so.
The two most likely contenders, Pseudonaja a. affinis and P. mengdeni are both extremely variable, so it could be both, but juvenile P. affinis are described as having "a black head and nape, and dark flecks on body forming a herring-bone pattern." (Wilson & Swan, 2021) Which is what we have here I think.