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…showed last 75 words of 408 total…quality in North Carolina was primarily evaluated using physical and chemical data collected by the Division of Environmental Management (DEM) from a statewide fixed-station network and biological assessments. These include macroinvertebrate (aquatic insect) community surveys, fish community structure analyses, phytoplankton analyses, bioassays, and limnological review of lakes and watersheds. Other sources of information were point source monitoring data, shellfish closure reports, lake trophic state studies, and reports prepared by other local, State, and Federal agencies.