Gilles, I can't speak about Lake Trout as I don't target them, but I can tell you I have had perch, gills, bass, northerns, walleye, crappie, and an occasional whitefish hang out around my camera and not be spooked by it. I know what you mean about the disappointment of not seeing fish. The first time I used mine I saw nothing and there was nothing on the bottom but silt to view and confirm that I was getting a good picture. Wait till you get on a bunch of fish. I'm sure you'll love it.