Read about those during the 1960s. The textbook said that lampreys lived in the great lakes.
They live in the great lakes now. They’re considered the number 1 invasive species in the lakes. They were among the first invaders through locks and canals. They’re fairly well under control now but it costs some $20 million to keep them under control.
http://www.great-lakes.net/envt/flora-fauna/invasive/lamprey.html
http://www.glsc.usgs.gov/main.php?content=research_lamprey&title=...nu=research_invasive_fish