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The tropical redclaw crayfish Cherax quadricarinatus is increasingly being reported as an aquatic pest in parts of the world where it has been introduced or translocated. In this paper, we briefly document the invasion of a stream system in New South Wales, Australia. We discuss possible pathways of introduction, and the potential threats the invading species presents to the receiving environment. We suggest immediate action is required to ascertain the invasive potential of this species.

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