The marbled crayfish, Photo: Chucholl C/Wikimedia commons/CC BY

Threat of invasive crayfish

There’s concern that imported marbled crayfish may threaten local Swedish species.

Swedish Radio News reports that the invasive crayfish have been found in wetlands in Västergötland and in the Märsta River north of Stockholm. One concern is that they may spread new diseases to Swedish crayfish.


The marbled crayfish comes from the southeastern United States, but has been brought to Europe, as it’s popular in aquariums. But it is illegal to bring in or maintain living marbled crayfish in Swedish.

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