Turns out it's a pike, about 35cm long.
Some bloke's reply on the fishing forum;
"No size or bag limits. They are good live bait for most larger fish but are just as good as fresh cut bait for smaller fish. I have eaten them crumbed and fried but everything tastes good like that.
Watch out for the teeth as i witnessed a young bloke at woody point a few years back stick one under his armpit to steady the fish for hook removal and the fish latched onto his nipple and was not going to let go. Everyone standing by tried to help him get the fish off by laughing as loudly as we could as he was yelling which must have worked because the fish eventually let go after about 30 seconds."
Ouch!!
