ANN ARBOR, MI — Great Lakes fishery managers are moving a suite of new sea lamprey control tools into broader use after early tests sharply reduced reproduction of the invasive predator in several rivers.

The Great Lakes Fishery Commission (GLFC) announced this week that its long-running field experiments are shifting into full deployment through 2029, with new methods scheduled for use in 13 tributaries in lakes Superior, Michigan and Huron.

The initiative will complement lampricides and migration barriers, which have held sea lamprey numbers down for decades. Commission leaders said newer tools are needed to reach places where chemicals or permanent barriers are impractical.

“Development of supplemental sea lamprey control methods plays an important role within the program by expand

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