Chestnut Lamprey Lakes in Michigan

Rough fish like Chestnut Lamprey are often associated with eutrophic, nutrient-loaded waters. Their presence — documented in 5 Michigan lakes — is often a signal of how the rest of the fishery is functioning. Chestnut Lamprey is narrowly distributed — only 5 lakes in Michigan 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 phosphorus and chlorophyll-a readings on: a rough-fish-heavy fishery often reflects an underlying nutrient-loading problem in the watershed. Cross-reference the Chestnut Lamprey lake list below against each lake's clarity, phosphorus and algae readings: lakes with low nutrient readings and Chestnut Lamprey documented are the best places to start for recreational targeting.