the first pic is an example of a juvy bluegill that came from lake mendota in wisconsin, that is for comparison.
the second pic is the fish in question, this one was caught today out of a spring fed brook that is a tributary to the lower wisconsin river.
to my untrained eye, these two seem like different species. however, the lower wisconsin has fooled me before with color variations in species. for example, the longnose gar from lake mendota are olive color with spots along the body and yellow fins with spots. but the gar in the river are totally silver with pale spotted fins. (fun fact)
so anyways, anyone have any ideas here?