Paul Hobson / White-clawed crayfish (Austropotamobius pallipes) on riverbed, split level image. Staffordshire, England, UK. October.

Nick Upton / John Field placing White-clawed crayfish (Austropotamobius pallipes) in an inspection tray for sexing and health checks ahead of translocation to an ARK site, safe from Signal crayfish (Pacifastacus l...

Nick Upton / Richard Spyvee inspects a baited trap that has caught many White-clawed crayfish (Austropotamobius pallipes) under license in a well stocked stream for translocation of healthy Crayfish to an ARK site...

Nick Upton / Alan Sumnall of GWT releasing White-clawed crayfish (Austropotamobius pallipes) collected from a well stocked location at at an ARK site stream, safe from Signal crayfish (Pacifastacus leniusculus) an...

Nick Upton / GWT team placing White-clawed crayfish (Austropotamobius pallipes) collected from a well-stocked stream in buckets for release at an ARK site, safe from Signal crayfish (Pacifastacus leniusculus) and...

Nick Upton / John Field and a GWT volunteer inspecting White-clawed crayfish (Austropotamobius pallipes) caught in a well-stocked stream to check their size, sex and health ahead of translocation to an ARK site, s...

Nick Upton / Richard Spyvee lifting a baited trap set for White-clawed crayfish (Austropotamobius pallipes) under license in a well stocked stream for translocation of healthy Crayfish to an ARK site, safe from Si...

Nick Upton / White-clawed crayfish (Austropotamobius pallipes) collected from a well-stocked stream being released at an ARK site stream, safe from Signal crayfish (Pacifastacus leniusculus) and Crayfish plague, E...

Nick Upton / Emma Settle of GWT disinfecting her boots before helping to release White-clawed crayfish (Austropotamobius pallipes) at an ARK site, safe from Signal crayfish (Pacifastacus leniusculus) and Crayfish...

Nick Upton / Large White-clawed crayfish (Austropotamobius pallipes) caught in a well stocked stream ahead of translocation to an ARK site, safe from Signal crayfish (Pacifastacus leniusculus) and Crayfish plague,...

Nick Upton / Large male White-clawed crayfish (Austropotamobius pallipes) with claspers visible under the tail, caught in a well stocked stream ahead of translocation to an ARK site, safe from Signal crayfish (Pac...

Nick Upton / John Field releasing a very large male White-clawed crayfish (Austropotamobius pallipes) back to a well-stocked stream where it was caught in case it proved too aggressive for safe translocation to an...