Species that are considered uncertain risk need a more in-depth assessment beyond the Risk Summary to better define the species’ risk to U.S. environments. This additional information will help inform decisions on where, when, and how the species may be used to minimize risks of them becoming invasive.
Cherax robustus is a crayfish endemic to southeast Queensland, Australia. It occupies sandy, acidic heathland habitats and its distribution is mostly limited to four islands. Climate match to the contiguous U.S. is medium, with highest match occurring in Florida. No introductions are known, so the history of invasiveness is uncertain. The States of Florida and Washington have included this species on their respective lists of prohibited nonnative species, along with nearly all other Cherax crayfish. Given the lack of introduction history, overall risk assessment category for C. robustus is Uncertain.
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Uncertain Risk
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