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Are fresh water mussels good to eat?

Answer

It depends on your definition of "good."  Do you mean from a "taste" or "health" perspective?

Mussels are filter feeders and they will taste similar to the substrate and quality of water in which they reside.  They also will bioaccumulate heavy metals and other contaminants to a certain degree.

With that said, if you harvest mussels from a relatively clean water system and don't eat too many at a time; they can safely be consumed when taken from Idaho waters.