Sea lamprey control set for Amnicon RiverU.S. Fish and Wildlife Service personnel will return to apply lampricides to sections of Amnicon River (Douglas County), to kill sea lamprey larvae burrowed in the stream bottom.
U.S. Fish and Wildlife Service personnel will return to apply lampricides to sections of Amnicon River (Douglas County), to kill sea lamprey larvae burrowed in the stream bottom. Post-treatment evaluations of the application conducted during low stream discharge levels in July showed some lampreys survived. Application will be conducted sometime during Oct. 5-30, in accordance with State of Wisconsin permits.
The application will be complete in about six days. Application dates are tentative and may be changed based upon local weather or stream conditions near the time of treatment.
Sea lamprey larvae live in certain Great Lakes tributaries and transform to parasitic adults that migrate to the Great Lakes and kill fish. Failure to kill the larvae in streams would result in significant damage to the Great Lakes fishery. Infested tributaries must be treated every three to five years with lampricides to control sea lamprey populations.
Lampricides are carefully metered into the stream for approximately 12 hours, and continually analyzed at predetermined sites to assure that proper concentrations are maintained as the lampricides are carried downstream. Applicators are trained and are certified by regulatory agencies for aquatic applications of pesticides.
The U.S. Environmental Protection Agency and Health Canada Pest Management Regulatory Agency have reviewed human health and environmental safety data for lampricides, and concluded that the lampricides pose no unreasonable risk to the general population and the environment when applied at concentrations necessary to control larval sea lampreys. However, as with any pesticide, the public is advised to use discretion and minimize unnecessary exposure. Lampricides are selectively toxic to sea lampreys, but a few fish, insect, and broadleaf plants are sensitive. Persons confining bait fish or other organisms in stream water are advised to use an alternate water source because lampricides may cause mortality among aquatic organisms stressed by crowding and handling. Agricultural irrigation must be suspended for 24 hours, during and following treatment.