American red swamp crayfish in Dutch Amsterdam

This 10 January 2018 video about American red swamp crayfish in Dutch Amsterdam. Hundreds of thousands of individuals of this invasive species now live in the city’s waters.

Environmental DNA (eDNA) has successfully proven the presence of invasive crayfish in almost all the small streams around Lake Akan in Japan, suggesting that eDNA analysis is an efficient and highly sensitive method to assess the distribution of aquatic organisms. Researchers from Hokkaido University have found that signal crayfish, Pacifastacus leniusculus, may have endangered the habitat of Japanese crayfish, Cambaroides japonicas, through a survey method utilizing eDNA. The results suggest that signal crayfish are more widely distributed than Japanese crayfish in the streams around Lake Akan: here.