Interesting, I'll give that a try. The situation I described was a little odd, in that the water was very shallow, not much more than 1m deep, so no need to dive & not easy to hide. Also, the clearing with the fish had 3, maybe 4 main entry routes and I think I probably came in the same way as the fish (I might be wrong) between two large boulders sitting in deeper water (maybe 2-3m). I could probably hide behind/near the big boulders although, as I said, that might be the way they enter the clearing.
