Opposition frontbencher Brad Battin​ has again claimed professional firefighters failed to show up on Black Saturday, while trying to hose down an earlier mistake.

And once again, his information was incorrect.

Brad Battin.

As revealed by Fairfax Media, Mr Battin, the shadow minister for emergency services, infuriated firefighters when he told Parliament last week that no professional firefighters attended Black Saturday for the first 5½ hours during debate about changes to the state's firefighting authorities.

Mr Battin admitted his mistake on Monday but compounded the error by explaining that he meant there were no professionals fighting a specific fire at Bunyip state park on Black Saturday.