The miracle of YouTube brings us this video of underwater carp filming in Lake Burley Griffin, mostly from the Scrivener dam wall. It was posted by OzCarpCam with this note:
Unfortunately, the visibility is pretty bad at this time of year. It will improve slightly later on and in total darkness, the IR illumination makes quite a difference. This short clip was thrown together to collect the sightings that we had during over an hours testing.
There’s certainly a lot of them down there!