Heteroclinus tristis, also known as the Forster's Weedfish, Sharp-nose Weedfish and Longnose Weedfish, usually occurs in rockys areas or seaweed. Its behaviour and colouration make the species hard to observe. Endemic to temperate waters of southern Australia, from Sydney, New South Wales, to theRecherche Archipelago, Western Australia, and througout Tasmania.
A large well-camouflaged weedfish with a long tapering snout and a very large mouth. The first dorsal fin arises on top of the head behind the eye and is not connected to the second dorsal fin. Variably yellowish, to reddish and brown, usually with complex markings including dark spots, and a mosaic pattern of yellowish spots and bands; lower part of head and belly with large white spots, a dark bar from eye to end of jaws; fins with many small transparent patches, fin-tips sometimes yellow.
Heteroclinus tristis is a carnivor and feed on small fishes and invertebrates.