Florida Association of Benthologists (FAB)
- Organization formed to share expertise and information on the use of aquatic community structures and processes (quantity and quality of the biota) to evaluate water quality conditions and ecosystem function.
- http://floridabenthos.org/

Pacific Streamkeepers Federation
- A non-profit society helping streamkeepers take action through support, education, and building partnerships
- http://www.pskf.ca/

The North American Native Fishes Association
- Group's goal is to bring together professional and amateur aquarists, educators, students, anglers, fish and wildlife officials, and researchers in conservation efforts of the inhabitants of lakes and streams.
- http://www.nanfa.org/

Southern California Association Marine Invertebrate Taxonomists
- Promotes the study of marine invertebrate taxonomy in southern California. Site has extensive information on marine biota, zoology, and taxonomy.
- http://www.scamit.org/index.htm

South Florida Aquatic Plant Management Society
- Non-profit organization with interests in aquatic weed and plant management, growth of aquatic plants, and restoration of wetlands.
- http://www.sfapms.org

The Baltic Marine Biologists
- An international non-governmental scientific organization whose aim is to promote studies on the biological diversity, structure, function and sustainable management of the ecosystems of the Baltic Sea Area (the Baltic Sea, Belt Seas, Öresund and Kattega
- http://www.smf.su.se/bmb/