It’s a mystery. Invasive sea lamprey, the Great Lakes’ biggest predator, primarily feed on lake trout, one of the lakes’ most prized sports fish. When trout populations are high, researchers expect to see fewer lamprey-wounded fish, and more of those wounds when lamprey populations are spiking.
Click here for original story, Invasive sea lampreys in Great Lakes, and the lake trout they prey on, puzzle scientists
Source: Phys.org