Public urged to report sightings of invasive Signal Crayfish

Public Urged to Report Sightings of Invasive Signal Crayfish

Members of the public are urged to report any sightings of Signal Crayfish, after the invasive species was spotted near the Bridgewater Canal at Stockton Heath, Warrington.

Signal crayfish are an invasive species in the UK, larger than the native white-clawed crayfish, and can be identified by their reddish-brown colour and the distinctive pale blue-white "signal" spot on the claw joint.

They carry the crayfish plague, a disease lethal to native white-clawed crayfish, and also prey on native species, compete for food and habitat, and can significantly impact local fish stocks.

Do not touch or remove them if you spot invasive crayfish.

To report sightings, call the Environment Agency’s 24-hour hotline: 0800 807060.

Author's summary: Report Signal Crayfish sightings to protect native species.

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Warrington Worldwide Warrington Worldwide — 2025-10-27

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