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We often fish specifically for giant perch and in lakes such as you described, they are most always deep. We never get the giants while jigging though, always with tip-ups, fished with large live minnows set about 4-5 feet off bottom and they often hit very early, right at first light. It's usually all over for keeps by 10:00 AM. Our fish often average over 13 inches, by the way, and right up to 17-18 at times. Here's a couple photos to illustrate and not necessarily the biggest either.. -Jim(Image removed from quote.)(Image removed from quote.)