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Octopus, squid and cuttlefish:

• Cephalopoda
• In Search of Giant Squid
• Squid Page
• The Cephalopod Page

Sharks:

• American Elasmobranch Society
• Discovery Online, Shark Realities -- WebLinks
• Dr. Gruber's Shark Page
• Fact Sheet: The Basking Shark
• Fiona's Shark Mania
• IUCN/SSC Shark Specialist Group
• Pelagic Shark Research Foundation
• Sharks, Information & Conservation - By Ian Geraint Jones
• South African White Shark Research Institute
• The Shark Research Program
• The Whale Shark Bibliography

Turtles:

• Sites for Turtles, Tortoises and Terrapins
• Sea Turtle Bibliography - A searchable database of literature on sea turtles

Whales and Dolphins:

• The Dolphin Page
• Whale Watching Web

Other:

• The Penguin Page
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• The Plankton Net
• Jellyfish
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• Seaweed
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• Integrated Taxonomic Information System

Images:

• Mike Johnson Marine Natural History Photography
• Adirondack Aquatic Institute Phytoplankton Image Library

Online book catalogue:

• Natural History Book Service
• Sea Challengers Natural History Books

Journals and periodicals:

• Marine Biological Periodicals on the Internet
•  
• Journal of the Marine Biological Association of the United Kingdom
• Aquaculture
• Journal of Experimental Marine Biology and Ecology
• Marine Pollution Bulletin
• Ecological Modeling
• Fisheries Research
• Marine Environmental Research
• Aquatic Botany
• Aquatic Toxicology
• Oceanographic Literature Reviews
•  
• Nature
• Ecology
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• AGU - includes journals, Ocean Science & Hydrology sections, meetings, abstracts

• Aquanaut - On-line magazine for the diving community

Some online Glossaries (recommended by Jan E. Heckman):

• general marine science - http://life.bio.sunysb.edu/marinebio/glossary.html
• corals - http://porites.geology.uiowa.edu/database/corals/glossary/glossmnu.htm
• from StreamNet, fish and other glossaries - http://www.streamnet.org/ff/Glossary/
• Icthylogy sources - http://muse.bio.cornell.edu/cgi-bin/hl?fish

Other sources

• The World-Wide Web Virtual Library: Fish
• The World-Wide Web Virtual Library: Whale-Watching Web

• Center for Aquatic Plants
• Seaweed Home Page

• Coral Reef Monitoring Program
• Cyanide on Reef Corals

• Deep Sea Research Frontdoor

• StreamNet On-Line

Searching:

• Aquaguide - aquaculture and aquariology
• Aqualink
• Aquatic Biology Gopher
• Aquatic Network
• Aquatic Realm
• Aquaweb
• Fishweb - links to aquarium related resources
• The Fish Information Service (FINS)
• Yahoo! - Science:Biology:Marine Biology
• Yahoo! - Science:Earth Sciences:Oceanography

Discussion areas:

• rec.aquaria - Newsgroup
• alt.aquaria - Newsgroup
• sci.aquaria - Newsgroup
• sci.bio.fisheries
•  
• elasmol.htm ELASMO-L
• sharkl.htm SHARK-L