The video was recorded in Bunbury, the third-largest city in Western Australia.
One the crab net is lowered with some bait inside, it takes little time for a school of fish to jostle each other for a few bites. Before long, the camera picks up its first few crab visitors. According to a Reddit discussion on the video, the crabs filmed are likely Blue Swimmer Crabs.
The second time the net is brought back up to the surface, it’s got a crab in it, and it sure does its best to not end up as dinner.
Watch at about the two-minute mark for one of several appearances by a ray, and wait until the end for a brief dolphin cameo.