"Having mentioned the stocking of ponds with channel catfish,
I. punctatus, I should explain, that in that area of America,
A. natalis, locally "mudcat", is considered rather worthless. The mudcat is aptly named, as its flesh has a distinctly muddy flavor. This can also be true of the channel catfish, but is not normally the case. The mudcat has a very large head in comparison to the channel catfish, so it dresses out much lighter than the latter of the same weight. Many ponds are deliberately stocked with channel catfish and a hybrid sunfish,
Lepomis cyanellus x
Lepomis macrochirus. These sunfish produce predominantly male offspring and thus can not overpopulate a pond. If it is discovered that mudcats have appeared in the pond, it is considered ruined and drained, since these fish will quickly take over. Such infestations can be from several sources; the transfer of fish from pond to pond by herons, tornadoes emptying farm ponds and scattering their contents, including fish, over a wide area, and small boys who release their catches into new ponds."
More about the Mudcat here:
http://www.scotcat.com/articles/article27.htm