The smallest have about an inch diameter but different species get to be different sizes you have to be more specific in your questioning.
That depends on the species, as there are freshwater clams.
No.
No, consumers.
you should eat freshwater clams/oysters
Freshwater clams are filter feeders, so tiny foods like daphnia and rotifers and cyclops work well.
yes
Big Al's Aquarium Services often carries freshwater clams. There is one on Kennedy rd in Scar.
yes
Otters.
No, they need saltwater.
Marine clams, called mussels, reproduce by releasing their eggs and sperm into the water. Freshwater clams reproduce when the male releases his sperm into the water and the female sucks up the sperm into her body through her incurrent siphon.
they most r brownish