I have freshwater mussels in my pond. I have not identified them and just beginning to dig up some info about them. The results so far is that they are good indicators of water quality(problems kill them quicker than fish), they filter feed on algae very well(maybe that is why my pond clears so quickly and deeply), and their juveniles parasitize fish on the outside for a few weeks before dropping off (may be species specific depending on mussel species).
