About
Biological Indicators
Learn about biological indicators, what they are, the definition of
biological criteria, and other fun facts.
Why Use Biological Indicators?
Biological indicators can show problems otherwise missed or underestimated
in an ecosystem. Learn more about their use, and what we really
do with fish and macroinvertebrates.
Indicator Species
Ever wonder what species can help scientists learn more about an
ecosystem? Learn how to identify some of them, the methods used
to sample them, and why certain species make great indicators.
Key Concepts
Discuss what biological integrity is, multimetric indexes, and lessons
learned from biological indicators.
Bioassessment Programs
View an interactive map of the United States to find details about
individual state, tribal, territorial, or basin commission biological
assessment programs.
Resources
View our list of resources on biological indicators, links to other
biological indicators websites, and various on-line publications
of interest.
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Visit EPA’s Biological
Criteria Website from the Office of Water
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The
objective of the Clean Water Act is to restore and maintain the chemical,
physical, and biological integrity of the Nation’s waters.
– Sec. 101 (a)
It is the national goal, that wherever attainable,
an interim goal of water quality which provides for the protection
and propagation of fish, shellfish, and wildlife and provides for
recreation in and on the water be achieved by 1981.
– Sec. 101(a)(2)
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