The video, shot by marine biologist Sharee Marris, shows a sea dragon, a kind of animal related to the sea horse, near Portsea Pier, a habitat off Australia famous for weedy sea dragon sightings. The animal is drifting along over a tangle of underwater grasses, caught in something that at first looks like a kind of garment that has become caught around his little body.
A closer look reveals the little dress to be a plastic bag.