About the Callichthyidae family, or armored catfish, with more than 50 species native to the streams of South America, including genus Pterygoplichthys. Some are now found in Florida. These fish are known to "walk" on land using their pectoral fins.

Fact sheet, with photograph.

Information about three species in Minnesota.

Introduction to Family Siluridae, the catfish, with particular focus on the species Silurus glanis, the European Wels Catfish. Covers distribution, behaviour, sexual differences, and spawning. Includes photos.

Fact sheet, focused on the occurrence of this fish in the U.S. Great Lakes. Includes an image.

Resources for identification of the majority of the genera of Loricariidae, including those typically sold in the aquarium trade under the name pleco or plecostomus. Search by name, browse a taxonomic tree, or use the key.

Discussion and photos of the vermiculated sailfin catfish, an introduced nonindigenous species in Florida.