The red swamp crayfish (Procambarus clarkii) is an invasive freshwater crustacean in the UK, known for its aggressive nature and adaptability. Native to the southern United States, it has established populations in parts of Europe, though its presence in the UK is limited and closely monitored. This species poses significant ecological risks, including outcompeting native crayfish, altering habitats through burrowing, and spreading crayfish plague (Aphanomyces astaci), to which it is a carrier.
