The team disclosed the fine on Friday.
Ference raised the middle finger of his left glove after his goal cut the Canadiens' lead to 3-2 midway through the second period on Thursday night. The Bruins won 5-4 in overtime to even the series at 2-2. Game 5 is in Boston on Saturday night.
Ference said Friday he made the gesture while trying to pump his glove to celebrate the goal. He apologized Thursday night about the way it looked. Coach Claude Julien said Friday he believes his player's explanation.