leniusculus

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Signal crayfish, Pacifastacus leniusculus, crawls among muddy roots at river bank. North American crayfish, invasive species Royalty Free Stock Photo

Signal crayfish, Pacifastacus leniusculus, climbs on stone in water at river bank. North American crayfish, invasive species. Royalty Free Stock Photo

Signal Crayfish (Pacifastacus leniusculus)

Crayfish in autumn. Portrait of signal crayfish, Pacifastacus leniusculus, in colorful leaves showing claws. Royalty Free Stock Photo

Coot (Fulica atra) with its dinner a signal crayfish (Pacifastacus leniusculus). Royalty Free Stock Photo

Signal crayfish, Pacifastacus leniusculus, in water at sandy river bank. North American crayfish, invasive species in Europe Royalty Free Stock Photo

The signal crayfish, Pacifastacus leniusculus, is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the Scandinavian Astacus astacus fisheries, which were being damaged by crayfish plague, but the imports turned out to be a carrier of that disease. The signal crayfish is now considered an invasive species across Europe and Japan, ousting native species there.