by wyandottecaver » Oct 8, 2008 8:01 pm
LOL
sorry. The fish fossil is cool but is in no way indicative of how long the present species have been there.
To answer your question, epigean or surface fish are frequently found in caves and often develop permanent residence there. Any google search for caves and epigean fish should get you some sources. Sculpin are the most common, but I have been in at least a half dozen caves with stunted bluegill. It is also common for them to gradually lose pigment. Buffalo, carp, shiners, ect can also sometimes be found although most caves generally won't support large fish permanently so your case is a bit odd unless of course there is a easy water connection to an outside creek or river.
I'm not scared of the dark, it's the things IN the dark that make me nervous. :)