American brook lamprey Lakes in Minnesota & Wisconsin

American brook lamprey is a rough-fish species — typically common in productive, nutrient-rich lakes, sometimes treated as a management nuisance by anglers targeting game-fish. 3 lakes carry documentation. American brook lamprey is narrowly distributed — only 0 Minnesota lakes and 3 Wisconsin lakes have a documented record. The constraint is usually habitat: cold water, specific depth profile, or river connection.

Rough-fish-dominant lakes are worth checking the grade on: a rough-fish-heavy fishery often reflects an underlying nutrient-loading problem in the watershed. Cross-reference the American brook lamprey lake list below against the LakeGrade rubric: lakes with both an A or B grade and American brook lamprey documented are the best places to start for recreational targeting.