Pristine, please. With very little tolerance for pollution, the noble crayfish prefers aquatic environments in their most pure, untouched state. It pursues an omnivorous diet, from worms and aquatic insects to mollusks and plants. But an invisible enemy has invaded the streams that feed it: crayfish plague. This fearsome infection not only wipes out populations, but also persists in the crustacean's habitat, preventing reintroduction or colonization. Will the noble crayfish lose its pristine paradise forever?