Please welcome Eyoyo Underwater Fishing Cameras.https://amzn.to/3siEgXn
I am allways learning. I may be mistaken about the perch being the ones making the beds I see with my camera in the spot where I catch the perch. I just thought is was the perch making those holes in the bottom. Perhaps they were feeding on the fish eggs or minnows from another species that works under the ice. What do you think?