The fish in question is a southern brown bullhead. They look very different from those that are found further north. The spotted bullhead has a very distinct dark base to the dorsal fin and the spots are more uniform in appearance over the whole body. I had a spotted bullhead several years ago and the following 2 pictures are of that fish, Note the distinct dark base to the dorsal fin and the uniform coverage of round shaped spots...


I also had a flat bullhead at about the same time. They also have the distinct dark base to the dorsal fin and some what of a mottled pattern on the side but are more brown in appearance unlike the black with silver-whitish spots of the spotted.

I currently have a southern brown just like the fish in question... These are quite often found in LFS feeder tanks. I just shot these photos 10 minutes ago and did them in a hurry just for this post so they are not that great. Notice the randomly shaped and more unevenly distributed silver-whitish spots on a very dark almost black background. Also there is not a distinctly dark base to the dorsal fin.



Finally again not that great of a picture but this is a northern brown bullhead from Ohio, they are very differnt looking from the southern version of the same species...
