Round goby were introduced to the Great Lakes from Eurasia in the 1990s. Kara Holsopple: Tell me a little bit about the species. What does it look like? Sara Stahlman: The round goby is pretty small.

Two notorious Great Lakes invaders -- the zebra mussel and the round goby -- now play a central role in transferring toxic chemicals called PCBs up the food chain and into Saginaw Bay walleyes, one of ...