Hi Bob,
I am one of the guys, whose pond was taken over by Black Bullhead catfish. If you go back to the Texas Parks and Wildlife freshwater fish identification webpage, click on the "Catfish & Bullheads" picture.
http://www.tpwd.state.tx.us/fish/infish/species/catfish/ The good thing is, they are not bad to eat once you get the mud taste out.
BTW, my fishing buddy is from Louisiana. You should see the names they come up with. Except for catfish and bass, we hardly ever know if we are talking about the same fish!
There are couple of pictures on pg 2 and 3 of this thread.
http://www.pondboss.com/ubb/ultimatebb.php?ubb=get_topic;f=7;t=000127;p=3 ER