Didn't know they were in there, found this on the web:

"How can I prevent the spread of Round Gobies?

Learn to identify gobies. To enable biologists to track the spread of round gobies, up-to-date information on new sightings is needed. Your assistance is extremely important. If you catch a round goby preserve the fish either in alcohol (grocery store rubbing alcohol is fine) or by freezing it. Then contact your state fisheries management agency or a Sea Grant institute. Be prepared to describe when and where you caught the fish (the name of the lake or stream, and the nearest town). New sightings can be confirmed only by identification of a captured fish. Verbal reports cannot be used because sculpins can be easily mistaken for gobies."