The lamprey is considered a pest in the Great Lakes, where it has been working to decimate fish populations for more than 100 years
Nasty creature, the sea lamprey. With rows of gnashing, gnarled teeth hidden inside of a funnel-like sucking mouth at one end of their long, slimy bodies, lampreys look like eels ... and nobody likes those, either. The sea lamphrey spends its first three to seven years, blind and toothless, living at the bottom of rivers, hidden in the mud. Once they reach a certain size, sometimes reaching three feet long, they emerge from the mud and make their way to the sea, where they clamp onto fish with their teeth. A sharp, jabbing tongue attacks the flesh while a thick secretion from the mouth keeps the blood from clotting. If the lamphrey's prey doesn't bleed to death, it will almost certainly die from an infection.
The sea lamprey has long been considered a pest in the Great Lakes region, where it has been working to decimate fish populations for more than 100 years. It's unclear when the lamprey was first introduced to the area, but some suspect it was with the digging of the Welland Canal in the late 19th century or with improvements to the 27-mile-long Canal that were made in 1919. The Canal allowed large cargo ships -- and also lampreys -- to bypass Niagara Falls.