Steven Smith accepted that he needs to improve his behaviour in the wake of the ugly incident which marred Australia's return to the top.
Josh Hazlewood too was fined 15 percent for a similar offence.
Some Australian players family and children were targeted by alleged fans during the course of the final Test match at Christchurch
Brendon McCullum slammed the fastest ton in his final Test.
Brendon McCllum has left a mark with his fastest Test century, though Australia snatched victory from jaws of New Zealand and ranking themselves as No.1 Test team in ICC rankings.
Steven Smith said he believed at the time he was acting correctly to question the umpire's decision.
Fast bowler Josh Hazlewood, who unleashed a profanity-laden barrage at the umpires after an lbw appeal was turned down, pleaded guilty to a similar charge Tuesday and was fined 15 percent of his match fee.
Steven Smith, Joe Burns hit fifties on Day 5 as Australia achieved target of 201 set by New Zealand with ease retaining the Trans-Tasman Trophy 2015-16.
Catch the Live Cricket Scorecard of New Zealand vs Australia 2015-16, 2nd Test, Day 5 at Christchurch.
Catch the live streaming of the Day 5 of the second Test between New Zealand and Australia on Eversport.