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Photos: Fighting sea lamprey in Lake Superior

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Tom Davies
United States Fish and Wildlife Service biology technician Tom Davies displays the power of the lamprey's suction Thursday morning along the Brule River in northern Wisconsin.
Derek Montgomery for MPR
Gallery
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Corey Goldsworthy, Ryan Bart
Minnesota Department of Natural Resources fisheries biologist Corey Goldsworthy, left, and intern Ryan Bart retrieve a buoy that was in Lake Superior to mark the location of nets dropped to catch lake trout as part of their May survey of the fish to look for signs of lamprey wounds Tuesday, May 22, 2012, on Lake Superior north of Duluth, Minn.
Derek Montgomery for MPR
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Tom Davies
United States Fish and Wildlife Service biology technician Tom Davies displays the power of the lamprey's suction Thursday morning along the Brule River in northern Wisconsin.
Derek Montgomery for MPR
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Lamprey
Lamprey use their many teeth to latch onto the side of lake trout and suck their body fluids until the trout die. It's estimated that each lamprey kill between 10 and 40 pounds of lake trout during their lifespan, which is estimated at 18 months.
Derek Montgomery for MPR