The U.S. Environmental Protection Agency (EPA) has published A Primer on Using Biological Assessment to Support Water Quality Management. This technical document serves as a primer on the role of biological assessments in a variety of water quality management program applications including reporting on the condition of aquatic biota, developing biological criteria, and assessing environmental results of management actions. The primer provides information on  technical tools and approaches for developing strong biological assessment programs and examples of application of biological assessment information by states and tribes.

For more information: http://water.epa.gov/scitech/swguidance/standards/criteria/aqlife/biocriteria/index.cfm

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