Leatherjacket fish are easily recognised by the spine they have above their eye. In Australia there are approximately 90 species, with more than half of them found within the cooler temperate waters of Australia. Here in Chowder Bay you might find the large fan-bellied Leatherjacket and the smaller, red Mosaic Leatherjacket.
Leatherjackets are commonly caught by recreational fishers. Just be careful of their spine and rough skin.