Thanks gents.
We did do our homework and had the VFA species and bag limit app and knew what we could or couldn't take and size limits, but since we thought it was 1) Carp, an invasive species you are not allowed to put back or use as bait and 2) the size was 29cm, where most fish limits are in the 20cm-27cm range, so we thought even if it wasn't, it'd be legal. and 3) It didn't look like any of the species that the VFA listed as not being able to take
It was at Apollo Bay, in the Ocean but I think not that far from where a river meets the ocean.
I googled Wrasse, and maybe the photo is deceptive but it doesn't look like any of the images that came up, although it could be a sub species I guess. The fish was quite dark brown rather than colourful (which a lot of the Wrasse images seem to be).