This little guy is a Tasmanian Clingfish,
Aspasmogaster tasmaniensis, which would make him a long way from home here under Edithburgh Jetty.
In fact judging by the number of these clingfish I see here I think the entire 'Apple Isle' population must have emigrated. All humor aside I find it strange that many critters have names pinning them to some location when in fact they are quite widespread.
The thing I adore about clingfish is that they always look like they are smiling and they make me smile too every time I see one.
Photo: Robert Rath, 'Clingy', 1/100s f/14 ISO320 100mm