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Environmental DNA (eDNA) is the genetic material from a plant or animal that is found in the air, water or soil. Fish, such as invasive carp, release DNA into the environment in the form of skin cells, secretions, and feces. This DNA can be collected from water samples in the field and be used to indicate the potential presence of an individual species. eDNA testing is useful as a potential early indicator of invasive carp presence and was developed to improve monitoring of such aquatic invasive species.

Black carp, which are an invasive fish species in North America, are now known to be established in the wild in parts of the Mississippi River basin. A new study co-authored by the U.S. Geological Survey (USGS) is the first to identify an established population—meaning they are naturally reproducing and living to adulthood— of wild black carp in any location across the U.S.

When a black carp is captured in the wild, it can be reported to the USGS Nonindigenous Aquatic Species database. That tool compiles information on and can be used to track the status of other aquatic invasive species as well. The USGS is involved in many invasive species projects across the U.S. and its territories. Learn more by visiting the USGS Invasive Species website or the USGS Invasive Carp section.

Advanced tools help our scientists detect native and invasive species in Lake Ontario and the St. Lawrence River.

Provides detailed collection information as well as animated map.