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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.

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

We haven't written up this one. Hindustan Times - World News has the full story — the link below goes straight to it.

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