I don't know, could be any number of species. I once listened to a seminar on walleye fishing in which the speaker said " when I mark fish on my finder and can't get them to bite in 30 min, I call them carp and move on." Could just be lake chubs or whitefish or something like that. I haven't actually fished that lake and am not familiar with the available species. One method that has worked well for me in the past is to troll the weed edges of the lake with plugs then take note of what you caught and where and come back and fish that area with specific gear, ie: bass/panfish gear. Good luck!