"Expanding habitats often mean larger fish since there's more food availability," Kitchell said. "Lamprey like larger fish."
Sea lamprey attach to a host fish and suck the life out of it. Each sea lamprey can kill 40 or more pounds of fish during its life.
Keweenaw Bay Indian Community anglers are seeing more and more of the blood-suckers, Ravindran said.
"We see an increased number of sea lamprey markings," Ravindran said. "[It was] rare to see the markings on anything but trout. It's now on herring, whitefish."
And with the changes in temperature, the intimate knowledge of the lake that tribes and other anglers have cultivated over the years no longer jibes with reality, Ravindran said.
"People used to know, 'Well, the whitefish will be here this time of day, this time of year,'" she said. "Now they have to look around."
This article originally appeared at The Daily Climate, the climate change news source published by Environmental Health Sciences, a nonprofit media company.