The Swimmers had blowholes on the tops of their heads instead of nostrils, and their eyes were protected by a nictitating membrane. Their mouths were filled with sharp, pointed teeth, which they used to catch fish and for defense.
As a species, the Swimmers were territorial and had a set of laws to govern their lives. For a fee, they would ferry people and cargo across their lakes on rafts.
Swimmers spoke an accented form of Galactic Basic, using their mouths to form the words.