I went trout fishing this weekend and would up getting into a "nest" of rock bass. Man, was that fun! Between the 2 of us in a matter of a about 1.5 hours we caught 35 of the little dickens.
Here's a "stock photo" of one. ( http://www.tnfish.org/Photogallery/Fish ... us_jpg.jpg ....if link doesn't work go to tnfish.org/Photogallery and look up rock bass ).
If you have never seen nor caught one they look like a cross between a "sunfish" and a smallmouth bass.

Other names: Northern rock bass, redeye, goggle eye, black perch, rock sunfish, redeye bass.

Yeah I always thought a "rockbass" was a mythical thing too . I used to always say everytime I got a hook hung up on anything that I "caught a rock bass"

We caught them on an olive wooley bugger with either a bead head or a split shot to get them down 6-8 ft. deep in a rock crevice in clear, cold water.