Which animal was once considered the greatest threat to the Great Lakes?

Question

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The sea lamprey was once considered the greatest threat to the Great Lakes as they are parasitic and attach themselves to fish, draining their blood and often causing their death. They were first introduced to the Great Lakes in the 1830s through the Welland Canal, and their numbers grew rapidly, causing significant damage to fish populations in the region.

Which Animal Was Once Considered the Greatest Threat to the Great