Diet
Adult silver lampreys are parasitic, feeding on the blood of other fishes. Non-parasitic lamprey feed only as larvae, then die. Silver lampreys use their oral discs to attach to their hosts, then cut through the skin and scales with their teeth. The lamprey will remain attached to the host over a long period of time, but they seldom kill their host (which have coevolved with these lampreys). Adults feed on a variety of fishes, including trout, Whitefish, Smelt, Pike, White Sucker, Brown Bullhead, Rock Bass, Walleye, and the armored Lake Sturgeon. The silver lamprey's larval young feed on drifting plankton, algae and detritus.
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