Sources
http://www.miseagrant.umich.edu/explore/native-and-invasive-species/species/fish-species-in-michigan-and-the-great-lakes/round-goby/
http://www.seagrant.umn.edu/ais/roundgoby#general
http://dnr.state.mn.us/invasives/aquaticanimals/roundgoby/index.html
http://web2.uwindsor.ca/courses/biology/corkum/goby/goby.htm
http://www.seagrant.umn.edu/ais/roundgoby#general
http://dnr.state.mn.us/invasives/aquaticanimals/roundgoby/index.html
http://web2.uwindsor.ca/courses/biology/corkum/goby/goby.htm