River-dwelling crustaceans resembling small lobsters, commonly farmed in ponds. Crayfish from China in particular are not recommended.
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The Monterey Bay Aquarium states that US farmed crayfish are a "Best Choice", but to "Avoid" imported ones. The MCS, FishWatch and Greenpeace have no data. So while this view is probably too US-centric, in the absence of further information, US crayfish is rated as sustainable and all other crayfish is not.