![]() sea lamprey in an aquarium (photo by jhy) |
from a news release of US Fish and Wildlife Service
US Fish and Wildlife Service personnel will apply lampricides to the Pere Marquette River (Mason and Lake Counties) to kill invasive sea lamprey larvae burrowed in the stream bottom. Applications will be conducted between July 6 and 10, 2026, in accordance with State of Michigan permits. Application dates are tentative and may be changed due to either stream or weather conditions.
Sea lampreys are native to the Atlantic Ocean, but invaded the Great Lakes through shipping channels in the early 1900s. They attach to fish with their circular mouths lined with teeth and suck body fluids. Each lamprey can consume about 40 pounds of fish, and each spawning pair can produce 100,000 eggs. They must be controlled regularly in the larval stage.
Although the lampricide is not applied in a concentration high enough to harm humans, it is recommended that people stay out of the water during treatment. The water should not be used for agricultural purposes on the day of treatment. By implication, using river water for camping needs on these days would also be unwise.
The Pentwater and White Rivers will also be treated this summer.
For more information, call 1-906-226-6571.
See Great Lakes Fisheries Commission
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