Durb, in case you didn't get to see this yet: you can always rightclick on the link and choose "Save link as..." to save it to your computer. Just choose the location (like your desktop) and hit Okay/Save. Cheers,
-Ian
I would put money on the fact that they're using magnets or something similar. If you pay any attention at all, you will see that the fish aren't even showing any signs of TRYING to swim throughtout most of the video. They are just gliding along most of the time. Caudal fins hardly moving, and pectoral fins also rarely moving. The last part of their bodies hardly wiggles either!
SO, unless fish have learned to swim and turn without moving any muscles, I think some form of magnet is involved.
-Ian