Alaskan freshwater bony fish. It is characterized by its dorsal fin being far back and opposite its anal fin. The scales of the black fish are very small and embedded in the skin. It lives in peat bogs and small rivers. During the winter it hides in the mud, and may even survive in solid ice.

Classification
The black fish Dallia pectoralis is in the order Salmoniformes, class Osteichthyes.