The Marine Fish Library
- A complete pictorial of marine fish species. Detailed information on biology, morphology, identification, and care.
- http://www.fishlibrary.info/

syngnathid.org
- Dedicated to propagation, preservation and information about Syngnathid species, such as seahorses, sea-dragons and pipefish. Includes message board, articles and photo gallery.
- http://www.syngnathid.org

Anemones
- Provides information on different types of anemones and how to care for them.
- http://fins.actwin.com/species/anemone.html

The Lurker's Guide to Stomatopods
- Guide to mantis shrimps of order stomatopoda.
- http://www.blueboard.com/mantis/

Docslaw Seaworld
- Provides information on keeping and breeding seahorses and pipefish. Includes photos of other unusual aquarium animals and photos of the author's tank.
- http://www.seahorses.de

The Seahorse Trust
- Charitable organization for the research and conservation of seahorses worldwide. In Flash.
- http://www.theseahorsetrust.co.uk/

Seahorses
- Personal experience of keeping and breeding seahorses as well as some success gimmicks and medical care. In five languages.
- http://www.mysunrise.ch/users/hippo/seaho.htm

Cowfish
- Species-specific information about some representatives of the families Balistidae, Diodontidae, Monocanthidae, Ostraciidae, and Tetraodontidae.
- http://www.cowfishes.com/

Seahorse.org
- Forum, information and assistance on seahorse husbandry.
- http://www.seahorse.org/