American Society of Ichthyologists and Herpetologists
National Oceanic and Atmospheric Administration- Fisheries Service
Electronic Zoo / NetVet - Fish Page
Fish Information Service (FINS) Index (mostly for aquarium hobbyists)
The Oceanic and Atmospheric Sciences Internet Locator
A CATALOG OF THE SPECIES OF FISHES
Dictionary within the Ichthyology Web Resources page
Palaeos: a paleontology site, vertebrate section
Tree of Life: starting at the Craniata
University of California Paleontology Museum: starting at the vertebrates