Around the Great Lakes, millions of dollars are spent to fight invasive species like Asian carp. They cause a lot of damage. But when scientists discover a new animal or plant in the region, it’s not always clear if it’s harmful - or helpful.
That debate has begun over a shrimp.
The bloody red shrimp is roughly the size of a pencil eraser. They came to the Great Lakes around 2006, hitching a ride in the ballast water of cargo ships from the Black Sea.
Since then, they’ve worked their way into all of the Great Lakes except Superior.