I know of a freshwater shrimp by its generic name of Gammarus sp., native of the British Isles, but these may also be found in the US though presently I cannot verify that. However, I have concerns that these shrimps could be vectors for fish diseases and parasites.
I did a search and came up with this rather interesting website, called Edible Memphis and hope it could be useful to you.
Don't know if this is exactly what you are looking for, but the Monterey Bay Aquarium puts out sustainable seafood guides.
Mom "D" to DD1 "Z" (15) and DD2 "I" (11) DH "M"