blue catfish

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A large bluish freshwater catfish (Ictalurus furcatus) of North America and especially the Mississippi River basin, sometimes weighing more than 45 kilograms (100 pounds).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a large catfish of the Mississippi valley