While I can’t speak about scaly fish, a few winters back Krook and I went to a location we knew help channel cats.
I dropped the Marcum camera down with some bait attached. The leds were turned on high. After 20 minutes of nothing, I scratched my head and turned off the lights for the heck of it.
Just moments after turning off the light 2 cats came in a the third one slammed the bait.
Once home a looking at the video on the computer, I could see the shadows of cats that wouldn’t come to the bait with the lights on.
I’ll never say never on the river, but I’m not a fan.