All Catfish Species Inventory
- Project aiming to develop a complete taxonomy of catfishes, including discovery and description of many new species. Includes taxonomic information, many images, and profiles of ongoing field and phylogenetic projects.
- http://silurus.acnatsci.org/

The Loricariidae
- Dr. Jonathan Armbruster's site devoted to the largest family of catfishes, including the fish typically sold in the aquarium trade under the name pleco or plecostomus. Includes list of taxa, identification key, and phylogenetic tree.
- http://www.auburn.edu/academic/science_math/res_area/loricariid/fish_key/lorhome/

Vermiculated Sailfin Catfish (Pterygoplichthys disjunctivus)
- Discussion and photos of this introduced nonindigenous species in Florida.
- http://nas.er.usgs.gov/queries/FactSheet.asp?speciesID=767

Catfish Biology and Identification
- Information about three species in Minnesota.
- http://www.dnr.state.mn.us/fish/catfish/biology.html

Armored Catfish Picture and Description
- 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 f
- http://www.thejump.net/id/armoredcatfish.htm

Catfish, the Basics
- 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.
- http://www.fisheriesmanagement.co.uk/catfish/catfish_introduction.htm

Channel Catfish: Ictalurus punctatus
- Fact sheet, focused on the occurrence of this fish in the U.S. Great Lakes. Includes an image.
- http://www.michigan.gov/dnr/0,1607,7-153-10364_18958-45660--,00.html

Brown Bullhead: Ictalurus nebulosus
- Fact sheet, with photograph.
- http://www.michigan.gov/dnr/0,1607,7-153-10364_18958-45648--,00.html