Bill, that is why I mentioned them by name. They are very different than our native mussels and there was no information on them in Pond Boss that I could find. They are extremely abundant in the Potomac River watershed. I collect them, crack them and use them to fish for catfish and often catch other fish on them as well. My biggest concern is as you mentioned, them becoming overly abundant and over filtering the pond and impacting the balance of the food chain... If the pond has a high nutrient load from negative run off sources, could the clams be beneficial in keeping algal blooms etc under control?