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AH_Signal Crayfish Pacifastacus leniusculus_1380.jpg
Signal Crayfish {Pacifastacus leniusculus}, a species introduced to the UK from North America. Signal Crayfish can transmit a fungal disease 'crayfish plague' to native Birtish white-clawed crayfish, posing a serious threat to the species. Even if they don't carry the crayfish plague, the signal crayish are far larger and more aggressive than the native species, and can easily out-compete them. Derbyshire, UK.