Bearded Cod
For years we thought that the Bearded Cod was actually a catfish. They hide in the dark, under ledges just like catfish and they even have whiskers like catfish. But it's just one whisker and one whisker doesn't make a catfish.
They're actually a red version of the Atlantic Cod which was so popular that it was fished to near extinction. Maybe the Bearded Cod heard the story and that's why they're hiding out in Sydney.