Try getting a shot of it from the side.
I can't quite tell that it's a darter, let alone what kind. The front
view makes it kind of hard to see anything determinate. My guess is, from
looking at it, that it's some kind of either Percina or a cave-spawning
Etheostoma (wthe new name of which I'm lanking on, starts with an N.)
Josuha
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