Biosecurity in response to the invasive shrimp, Dikerogammarus villosus Dr Mark Diamond, Environment Agency

Current situation Grafham Water Diddington Brook ? Cardiff Bay Eglwys Nunydd & Tata’s ditch Monitoring: 80 other sites considered at risk are all negative Kick-sampling and trap-sampling ongoing

Biosecurity at known locations Local Risk Assessment and management plan produced for the three sites Anglers Water Sports Diddington Brook / Tata ditch Testing of efficacy of biosecurity measures at Grafham Water

Biosecurity : what have we learnt ? Jet-washing greatly reduces the numbers of shrimp Small shrimps are hard to see (!) The residual risk from boats and trailers is low after supervised biosecurity Nets, bass bags and neoprene stocking and boot waders need particular attention Disinfectant needed (R&D started)

Biosecurity what have we learnt 2: Survival in damp conditions In a concrete outbuilding (1 – 10 o C) Survived 6 days on a folded damp net 9 days in a plastic groove 15 days in a folded wader All die within 48 hours of drying

Ideal biosecurity: current advice Signage and guidance on-site One point of access, with supervision All equipment that enters site should be clean and have been dry for 48 hours Minimise contact with water After use equipment should be thoroughly washed and thoroughly dry for 48 hours before being used elsewhere Independent post-biosecurity check

How can Riverfly Partnership and AMI help? Look out for the shrimp when monitoring Take biosecurity measures when sampling Promote good biosecurity elsewhere Further information at