Potomac Largemouth Bass Study

Bass Catch Index –  The fresh tidal bass program has collected data on the distribution of largemouth bass in the Potomac River since the 1980s. Its survey methods became standardized among other rivers in the Chesapeake Bay watershed in 1999, according to MD DNR.

The attached interactive map (click the link below, and then click on the mapping to enlarge) shows survey data on largemouth bass collected by fisheries biologists at the Maryland Department of Natural Resources, using the electroshock catching method, for 120 locations along the Maryland side of the Potomac River in 2009, 2010 and 2012. The catch index represents an estimate of the number of largemouth bass collected at a particular location over the course of an hour.