This tread peaked my interest into researching what clam or the correct term mussel species that I actually have. I'm pretty sure they are Giant Floaters - Anodonta Grandis which are very common in slow moving streams and ponds over a large area of the mid west. There are 80 different species native to Ohio and aprox 300 in the US. All the many articles I have read state that the short time the mussel larval are attached to the host fish they do not harm the fish before they drop off and develop into mussels. I have not seen any young as of yet, added them to my pond system the summer of 2008. I do not have Kio but I do have Yellow goldfish, Sarassa goldfish, Golden Orfe one lonely shy channel cat and many bullfrogs. When I pull my lilies for dividing this spring I will check the clams to see if they have grown any larger. Trickers sells a different species that is not nearly as purdy or grows as large, called Elliptio Complanata native to North Eastern USA.