Animals in aquatic environments—such as fish, amphibians, crayfish, and mussels—release DNA into the water via their feces, urine, and skin. This external DNA is called environmental DNA (eDNA). By filtering water samples and analyzing them for eDNA, one can determine whether a species is present without actually capturing or seeing an individual. Different species can be identified by using genetic markers that are unique to them.
Document Type: Briefing Papers