Remi Masson / European crayfish (Astacus astacus) in a lake. Alps, Switzerland, July.
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Cyril Ruoso / Signal crayfish (Pacifastacus leniusculus), non-native invasive species. On riverbed in woodland. La Cure river, Morvan, Bourgogne-Franche-Comte, France. May.
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Cyril Ruoso / Signal crayfish (Pacifastacus leniusculus), non-native invasive species, on riverbed. La Cure river, Morvan, Bourgogne-Franche-Comte, France. May.
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Cyril Ruoso / Signal crayfish (Pacifastacus leniusculus), non-native invasive species, on riverbed in woodland. La Cure river, Morvan, Bourgogne-Franche-Comte, France. May.
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Paul Hobson / Signal crayfish (Pacifastacus leniusculus) on river bed near bridge, split level image. River Rivelin, Sheffield, England, UK. September 2018.
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Paul Hobson / Signal crayfish (Pacifastacus leniusculus) displaying aggression with claws up, split level. River Don, Sheffield, England, UK. September 2018.
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Paul Hobson / Signal crayfish (Pacifastacus leniusculus) displaying aggression with claws up. River Don, Sheffield, England, UK. September 2018.
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Paul Hobson / White-clawed crayfish (Austropotamobius pallipes) on riverbed, split level image. Staffordshire, England, UK. October.
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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...
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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...
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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...
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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...
