there are big invasive Fundulus catenatus (Northern Studfish) in John Bryan State Park (8 miles north of Xenia, OH).
I was just at John Bryan Park today. It seems like it was all gorge and rapids there; not Studfish habitat at all. What location would you find the Studfish areas? In the park, or nearby? I did find four of them today (about) 15 miles south of there though.