With the advice of a friend, I learned that when the perch bite is really slow, have a jigging lure and a dead bait on the bottom. With the help of a camera, I would watch the perch approach my jigging lure, then turn to the deadbait on the bottom. They would very subtly suck up the deadbait and quickly spit it out. I was able to catch a dozen perch by setting the hook when I saw them inhale the deadbait off the bottom. Without my camera, I wouldn't have caught a single fish.