http://www.actwin.com/WWWVL-Fish.html
The WWW Virtual Library index of Fish resources provides extensive links and information on fish-related topics including aquarium-pertinent stuff such as the Breeder's Registry and FINS-Fish Information System; biology (ichthyology) including links to Deep-Sea Research and The Wild Dolphin Project; Aquatic Environmentalism with access to The Columbia River Salmon Passage model and the Dam and Reservoir Impact and Information Archive; and fishing as a sport with links to Angling Club Lax-A, The Bass Fishing Page, The Saltwater Fishing Page, and The Virtual Flyshop. You can also find resources for newsgroups and mailing lists on fishing, aquariums, and aquatic animals.