sea lamprey (photo by jhy)
based on a news article in the Oceana Herald Journal, from the U.S. Fish and Wildlife Service
Every three to five years the U.S. Fish and Wildlife Service treats infected Great Lakes tributaries with lampricides to control the devastating populations of sea lamprey. Larvae burrow in the mud of stream bottoms and, if not eliminated, grow to the adults that parasitize and kill fish.
Permits from the State of Michigan have been issued for treatment of the Pere Marquette River, to be completed between July 29 and August 7. A firm date cannot be established ahead of time because application depends upon weather and local stream conditions.
The lampricides used will be Lampricid and Bayluscide. These have been tested as posing no risk to humans at the concentration levels used for treatment. However, it is advised to minimize unnecessary exposure. There is some risk to certain fish, insects and broadleaf plants. Confined bait or other animals in the river should be moved because there is greater risk to crowded populations. In addition, no river water may be used for irrigation for a period of 24 hours following treatment.
Monitoring will be carefully conducted. Dye may be observed in the river as streamflow is gauged.
For further information, call 1-800-472-9212.
See Pheromones May Aid in Controlling Sea Lamprey
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