General aquatic ecology

Underwater web cams
http://shamozzle.com/WorldWEBCAMwatchUNDERWATER.html
A series of links to underwater webcams. Most are in large public aquaria but some are in the open ocean.

World Conservation Monitoring Centre
www.unep-wcmc.org
Part of the United Nation Environment Programme, the WCMC has produced guides and atlases quantifying biodiversity and threats. The atlas includes maps showing biodiversity hotspots for freshwater fish, crustaceans, sea grasses, mangroves and many other aquatic groups. Also available to download are detailed reports on many of these groups.

Classification of organisms
www.tolweb.org/tree/
The ‘Tree of Life’, an expanding database outlining classification of the world’s organisms, with links to images and further information.