Hi Mate
I used to live in Melbourne and during June there aint much fish swimming around down there. The only real good land based spot is called 'The Hotties' its a Power station hot water outlet at Newport which is pretty much under the western side of West Gate Bridge only 15min from the Casino.
They catch Talior,Salmon,Bream,Blackfish,Mullet and pinkie snapper there
You could drive 2hours to Queenscliff and Flinders or 3hours to Lorne to catch squid and barracotta.
Hope that info helped