General Science

General Science Experts

Billy G Justus

The U.S. Geological Survey
United States Virgin Islands


Billy received an MS in biology from Arkansas State University in 1989. He worked as an aquatic biologist with the Mississippi Department of Environmental Quality from 1989 to 1997, after which, he began working with USGS as an aquatic biologist for the National Water Quality Assessment Program. Much of Billy’s career has been spent collaborating on quantitative, interpretive, multidisciplinary studies that investigate interactions between aquatic biota and ecological conditions using a variety of statistical methods. Some of his most recent publications have identified chemical constituent concentrations as biological thresholds that can be used to identify appropriate water-quality criteria. He has extensive experience with electrofishing and fish taxonomy and has led fish sampling crews and served as field taxonomist in 18 states. He is an adjunct professor at Arkansas State University where he participates on various thesis committees and assists students and faculty in developing investigative studies.

Research Interest

ecological competition environmental assessment freshwater ecosystems wetland ecosystems contamination and pollution


  • A comparison of algal, macroinvertebrate, and fish assemblage indices for assessing low-level nutrient enrichment in wadeable Ozark streams

  • Effects of land use, stream habitat, and water quality on biological communities of wadeable streams in the Illinois River Basin of Arkansas, 2011 and 2012

  • Water quality of potential reference lakes in the Arkansas Valley and Ouachita Mountain ecoregions, Arkansas,Justus, B.G.; Meredith, Bradley J.

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