Aquarian Subjects
Collection of aquarium and aquatic biology literature as well as club publications.
http://www.mindspring.com/~aquaristics/aquarian.subjects/

Aquatic Book Shop
Offers a large selection of Aquarium and Fish books, magazines, videos and supplies.
http://www.seahorses.com/

Cichlid Press
publishes books, posters and videos on cichlids and a taxonomic reference service to scientists and hobbyists.
http://www.cichlidpress.com/

FishBookstore.com
Aquarium books, posters and CD-Rom lexicons.
http://www.fishbookstore.com/