VICTORIA'S Aaron Finch has been found guilty of ball-tampering in the Sheffield Shield victory over South Australia.

Cricket Australia have advised that Victorian Bushranger Aaron Finch has been fined 50% of his match fee for changing the condition of the ball during the Weet-Bix Sheffield Shield match against South Australia at the Adelaide Oval that finished yesterday.

Finch was fined half of his match fee at a Cricket Australia code of behaviour commission in Adelaide.

Finch told the commissioner, Judge David Smith, he was "most likely responsible for the damage to the ball", Cricket Australia said in a statement.

The initial level one charge against the Victorian team was withdrawn and changed to a level two offence against Finch under rule 2.7 of the CA Code of Behaviour relating to an individual ‘changing the condition of the ball in breach of law 42.3’.

The umpires found markings on the ball after play on day two (Saturday) and Victoria received an immediate five-run penalty as a result according to law 42.3.

The umpires noted markings on the ball after the final delivery at Adelaide Oval on Saturday, day two of the Shield game.

SA were awarded five penalty runs on Sunday.