are there any brackish water crayfish

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I don't think so. A few crayfish species found in coastal areas can tolerate temporary exposure to brackish water, but to my knowledge none are found there regularly. T. H. Huxley claimed Astacus leptodactylus was found in the Caspian Sea, but I have seen no more recent references to this.
 
There's a small handful of crayfish species that are supposed to be able to live in light brackish water. But the references to them are scattered and conflicting. Basically, I believe it's just going to be "crayfish/freshwater" and "lobsters/saltwater". :\
 
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