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| Ocean Arts Hawaii Underwater photography of Glenn T. Poulain from the shores of the Hawaiian Islands. |
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| Aqua-Marina Dive Centre PADI 5* Dive Centre in Playa de las Americas - south Tenerife - offering SCUBA diving courses and boat dives. |
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| Bioindicators of Aquatic Ecosystem Stress Biological indicators have been developed and applied at field sites in the eastern U.S. to assess the effects that environmental stressors such as contaminants have on the health of aquatic organisms... |
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| Environment Canada: Aquatic Ecosystems Part of the Fresh Water web site. |
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