Otters.
That depends on the species, as there are freshwater clams.
The Latin name for freshwater clams is generally referred to as "Unionidae," which is the family that includes many species of freshwater bivalves. Common examples include the genera "Lampsilis" and "Anodonta." These clams are found in various freshwater habitats around the world.
No, consumers.
No.
you should eat freshwater clams/oysters
Freshwater clams are filter feeders, so tiny foods like daphnia and rotifers and cyclops work well.
Clams are predated mostly by sea stars and some molluscs.
yes
Yes, freshwater clams are legal to harvest and eat in Maine. However, it is important to check with the Maine Department of Marine Resources for any specific regulations regarding the harvesting and consumption of freshwater clams in the state.
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.
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.