Biologists plan to treat Lake Champlain tributaries in Vermont, again this fall, with a chemical that kills sea lamprey.
The Lake Champlain Fish and Wildlife Management Cooperative will be treating the Winooski and Missisquoi rivers in September and October.
The treatment will kill off the lamprey, which attach themselves to fish and weaken them. The cooperative says yearly assessments continue to show that the program is working.
Last year, biologists recorded an average of 30 sea lamprey wounds per 100 lake trout and 19 per 100 Atlantic Salmon. That’s down from a high of 99 for lake trout in 2007, and 79 for Atlantic salmon in 2003.