https://www.bridgemi.com/michigan-environment-watch/msu-studying-lamprey-sex-can-birth-control-save-great-lakes-invaders
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They've been kept at bay for decades since, thanks to a chemical compound called TMF, or 3-trifluoromethyl-4-nitrophenol, which kills lamprey while sparing other species. Each year, more than 100 Great Lakes rivers are dosed with the chemicals at a cost of more than $20 million to US and Canadian taxpayers.."