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How can you tell the difference between a white crayfish and a signal crayfish?

Asked: David Trudel, Last Updated:

The signal crayfish has a distinctly smooth ridge running along the middle of the rostrum (the foremost projection of the carapace). In comparison, the native white-clawed crayfish is much smaller (under 12cm), with a brown to olive pitted body. The underside of the claws are usually a dirty-white colour – never red.

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