Otters.
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
yes
No, they need saltwater.
Like all clams, they have evolved into a specialized environment over time. Clams began as marine mollusks, but some of them developed the ability to survive in freshwater places where rivers empty into the sea. Those that were able to move further up the river had less predation and survived again. This goes on until freshwater clams are fully a part of the ecosystem and fit in with freshwater predators and freshwater mollusk diseases and have life-cycles and reproduction that matches the advantages of the environment.
Clams are predated mostly by sea stars and some molluscs.
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