Is there a single lake in that area that actually has a reasonable amount of natural reproduction? I’m gonna say no. They all rely on artificial stocking and I’m fairly sure that most lakes/rivers other than the big ones with sustained natural reproduction have stocking to keep them going. Heck, even Upper Red was stocked at one point.
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There isn’t a ton of natural reproduction in southern MN. Lake Shetek and Lake Sarah have decent natural reproduction but they are also heavily stocked. However, there is allot of lakes in the northern half of the state that rely solely on natural reproduction. Even small lakes. The only reason Red lake was ever stocked was because it was severely over-fished and the walleye population crashed. (side note on the URL walleye crash. Walleyes and Crappies compete, so once the walleyes were diminished that gave crappies the chance to flourish until the walleyes came back)
One of the main reasons southern MN doesn’t have much natural reproduction is because of the land use. All of that siltation from agriculture covers up the bottom substrate. There’s lakes that have 8 feet of silt covering the bottom! Not all of those lakes historically had never ending mud bottoms. Allot of that is runoff from farm fields. If you drive around southern MN in the winter look in the road ditches. They are all black with soil that blew off the surrounding fields because everyone tills everything into oblivion. All that runs into our lakes as well. Walleyes really struggle to spawn when their preferred spawning habitat is covered in silt.
If you actually look into walleye numbers and catch rates on some of the lakes that are stocked you would be appalled. The DNR should probably end stocking on 20% of the lakes they currently stock. The problem is, once you start stocking a lake the public won’t allow you to stop, even if it’s pointless. You can go to some of these lakes and talk to the cabin owners and they will all tell you the same story about Joe fisherman 10 years ago that caught two walleyes. They are all telling the same story. Dumping a bunch of walleyes in a lake that can’t support them doesn’t make fishing better. It’s just a waste of money. BUT people don’t know enough about aquatic ecosystems to realize that. A good proportion of our stocking is just theater.