Invertebrates, such as the caddisfly larvae pictured, are common in the world’s streams, and were netted, as were nine species of fish. Fish were stunned with a low charge of electricity for netting, then counted and released. Some species are known to be more tolerant of pollution than others, so an inventory of what is living in a stream can be a good indicator of water quality and stream health.
Results of this survey and others that make up the state’s monitoring project will take several months to compile. Virginia has more than five million water quality observations in its database; the third largest nationally.