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Scheduled treatment to control Sea Lamprey in Seneca Lake happening soon

  • / Updated:
  • Staff Report 

A scheduled lampricide treatment will begin in early June in Seneca Lake tributaries located in Chemung, Schuyler, and Yates counties to combat the parasitic sea lamprey population.


The New York State Department of Environmental Conservation (DEC) will use a lampricide called TFM to target immature sea lampreys before they mature into parasitic predators. Sea lampreys are harmful to fish species such as Atlantic salmon and lake trout. This treatment has been part of the DEC’s control program since 1982, applied every three to four years to maintain a healthier fish population in Seneca Lake and its tributaries.

The treatment is scheduled to start June 4 in Catharine Creek and June 6 in Keuka Lake Outlet. The New York State Department of Health advises against using river and lake water for drinking, household purposes, and watering livestock during treatment. Signs will be posted and removed once advisories, expected to last one to three days, are lifted.