Ive played with both fish & non fish models, neither seems to scare fish. I did not play with the lightening section of the ZT though. Perch really are curious and would swim right up to the lens to investigate, almost like they knew they were on TV. That was with a non fish model. Ive seen pikerels walleyes. bass, and gills, none of them seem to spook or swim off because of the cam. My brother witnessed a 23 1/2 walleye smash a spoon a couple weeks ago, the fish swam in hard and fast, so fast that all he saw was fins & tail. Its really a cool learning tool, many think its a toy or a fad, but an aqua vu will show you so much more that flashers cant dictate, mainly fish species, as well as what the bottom structure is. It would also make a good tool to find reefs, and structures unseen by sonar, that you could mark with a GPS, come back and find it, and fish a magnet! Im not saying to subsitute it for sonar, but when worked with a sonar unit, youve got a great team.