Yes, I am ABSOLUTELY POSITIVE that no cameras are allowed. We asked two different people working the AquaDuck and were told this. They stated that it is not safe because you must hold onto the handles on the raft the entire time. After we rode I understood why (for the first 1/2 or 2/3 of the ride anyway). Before we got off the ship we also heard someone saying that a guy got in trouble and was taken off the AquaDuck for sneaking a camera on. I believe the lady said the guy fell off the raft or something like that because he was using one or both of his hands to record video.
Now, I am not going to say that it might not be possible for someone to sneak one on, but I will say that it is not safe and that there is a HIGH POSSIBILITY you will be caught. They have their own cameras, you know?
Edited to add that the videos you have seen where it looks like someone is holding the camera are probably the same ones I have seen where the news person, or whoever was riding, had a contraption set up to hold the camera.
actually nope.. I know they were holding the camera because it was way too shaky and unstable and they were even able to move the camera to show the pool deck and the sea so I'm kinda confused now :\
here's the vid I'm talking about
http://www.youtube.com/watch?v=ZjAbfqBWTVM