In the 1960s, Sweden introduced signal crayfish to support fishing; the plague-carrying invaders helped cut native noble crayfish populations fourfold

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• Hindustan TimesLean L·2h ago

  In the 1960s, Sweden introduced signal crayfish to support fishing; the plague-carrying invaders helped cut native noble crayfish populations fourfold

  In the 1960s, Sweden introduced signal crayfish to boost fishing. They carry a plague deadly to native noble crayfish, whose numbers have dropped fourfold.

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