| Age of Aquariums | | Contains articles, descriptions of aquarium setups, species profiles, and a large photo gallery. |
| AquaLink | | Articles, bulletin boards, a trading board, and a diagnosis system for common diseases. |
| Aquaria Hobbyist | | Fora on many aquarium-related topics, archived forum threads, and user contributed articles and species profiles. |
| Aquarticles | | Database of articles about aquarium management, fish keeping, breeding, aquatic plants, saltwater aquariums, koi, ponds, goldfish, cold water fish, fish humour and aquarium club affairs. |
| Aquatics Unlimited | | Articles and tips covering general and beginner issues, aquarium equipment, fish compatibility, maintenance including pests and parasites, saltwater, ponds, water chemistry, fish health, plants and a miscellaneous section. |
| Breeding Tropical Fish | | Information on the keeping and breeding of tropical and coldwater freshwater and marine fish including sections on basic icthyology, water chemistry, fish health, species profiles, a message board, and MSN group signup. |
| Creating a Tropical Aquarium | | This is a guide to creating a Tropical Aquarium, and includes advice on maintenance and disease, as well as a lot of pictures of different fish species. |
| eFishTank | | An online aquarium maintenance program to help aquarists monitor their aquariums. Graph water parameters, enter livestock and equipment info, receive email reminders. |
| Everything About Fish | | Offers a brief history and the basics of icthyology, solid advice for beginners, a listing of families, genera or species suitable for the home aquarium, and an article about large-scale aquaculture. |
| Fish Geeks | | Offers a database with over 1,800 tropical and marine fish and plants, over 5,000 fish photos, chat room, and family friendly forums. |
| Fish, Tanks and Ponds | | Covers tropical, coldwater, freshwater and marine fish and inverts. Contains a forum, photo album, chat room, and various articles aimed at hobbyists with any level of experience. |
| LittleFishTank.com | | Contains bulletin boards and chat organized by topic, a few articles on keeping various fish and invertebrate species, FAQs, and product reviews. |
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