The sea lamprey is an invasive species to the Great Lakes region that has had a devastating impact on the nearby fishing industries and fish populations. There are methods of controlling the sea lamprey’s numbers, but we need to invest in the most effective forms to truly save the Great Lakes economy and environment. This jawless, eel-like vertebrate is a terrifying creature. It is similar to the shark in that it has no bones, only cartilage. The sea lamprey goes through four stages during its life