Clam

The Clam is a Benthic animal found at the bottom of the sea. It has a circular shadow. Diving is the only way to get it.

In New Leaf
In New Leaf an information board in the aquarium will list information about this creature.

"Bivalves shaped like chestnuts, they live in shallow waters and hide in sand when predators approach. They secrete a viscous liquid that gets pulled along by the current and enables long-distance travel. They are popular both roasted in the shell and cooked in a variety of soups and chowders."