Crayfish or crawfish were fresh water crustaceans resembling small lobsters, to which they were related. Crawfish étouffée was served at Sisko's Creole Kitchen. (DS9: "Image in the Sand")
In 2372, Joseph Sisko lightheartedly stopped his grandson Jake from pestering him by pointing out that he had a vat of crayfish that required cleaning with Jake's name on it. (DS9: "Homefront")