Billy G Justus


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.