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It has been my opinion for a very long time that having a completely closed season on largemouth bass is nonsense from a scientific perspective. Angling pressure during the spawn does next to nothing in effecting how successful a body of water is at producing largemouth bass. This is doubly true in weedy natural lakes. A lake's fertility, carrying capacity, and spawning habitat are what impact largemouth populations, not fishing pressure.
Get with the program state of Minnesota. Open up largemouth bass to catch and release fishing when not in season.