At one point in the video, filmed by Brandon Williss and posted to Facebook, a man can be seen yanking the shirt of a fan throwing him to the floor. Another shot sees a man in a Crows jumper shove another fan into a group of people while a woman nearby tries to prise apart two warring supporters.
Witness Aaron Tinsley, of Seaford Rise, told The Advertiser the brawl started as a squabble between Power and Crows fans before some Port supporters began spitting at spectators and beers were thrown.
"It was a bit of a shock and there were kids around as well so it wasn't a nice situation," he said. "They were a little bit frightened by it."
Channel 9 also aired footage of another incident, when security steeped in to break up two angry groups of fans in the stands during the game.
The stadium management and club seemed oblivious to the melee declaring the derby was generally a good natured affair with record numbers attending.
In a stadium, the Stadium Management Authority said, "Overall crowd behaviour was good - very much in line with other Showdowns."
South Australia Police said they were aware of the fight.
Stadium staff ejected the brawling supporters from the stadium.
