Minn. Stat. § 97C.391
Subd. 1. General restrictions.
A person may not buy or sell fish taken from the waters of this state, except:
Subd. 2. Restrictions on certain game fish.
Largemouth bass, smallmouth bass, rock bass, muskellunge, and sunfish may be bought or sold by a private hatchery or aquatic farm, or as prescribed by the commissioner.