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USFWS treats Brule, Amnicon rivers for lamprey

Superior Telegram

U.S. Fish and Wildlife Service personnel plan to apply lampricides to the Amnicon and Brule rivers in Douglas County to kill sea lamprey larvae burrowed in the stream bottom.

Applications will be conducted on or about June 26-July 3 in accordance with state of Wisconsin permits. Applications will be complete in about five 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.

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 in 2003 that Lampricid and Bayluscide 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.

People 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.

Prior to treatment, personnel collect data on stream water chemistry and discharge. In addition, they may conduct onsite toxicity tests with lampricides and stream flow studies with dyes that cause stream water to appear red or green.

Lampricides are metered into the stream for about 12 hours, and continually analyzed at predetermined sites to assure proper concentrations are maintained as the lampricides are carried downstream. Applicators are trained and are certified by Wisconsin regulatory agencies for aquatic applications of pesticides.

The program is contracted through the Great Lakes Fishery Commission to the U.S. Fish and Wildlife Service, and Fisheries and Oceans Canada.The Commission initiated chemical control of sea lampreys in 1958. Since that time, the highly successful program has contributed significantly to the maintenance of the $7 billion Great Lakes sport and commercial fisheries.

For information, call (800) 472-9212. TTY users may reach the Marquette or Ludington biological stations through the Michigan State Relay Service at (800) 649-3777.