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I have fished on a lake where this was a problem in the past. The DNR actually increased the limit to 6 northerns for about 5 years or so and put a slot on that they had to be under 20″ which really help to eliminate a good portion of the small fish and also increase the overall size of the fish. I wish they would do this on more lakes to help the problem.
I fish quite regularly on a lake where this was a real problem. No limit changes, but the lake association encouraged everyone to keep all northerns. We did that, and most everyone else did, too. In 5-6 seasons, we gradually saw not only bigger pike, but the sunfish & crappie population grew, too. It’s not uncommon now, to find schools of bigger panfish, and while you are fishing for them, latch onto a hungry pike in the 3-6 pound range. And we have seen much bigger pike in our searches. I heard a biologist say, ” think of it this way. If a lake can support 1000 pounds of fish, you can have 1000 one pounders, or 100 ten pounders. But the total will remain the same unless other factors are figured into play.” It kind of makes sense. Just my two cents worth.