Notacanthiformes - spiny eels, halosaurs

There are two families in this order. The fish in this order are found in deep offshore waters around the world.

The fish in this order lack an adipose fin. The adipose fin is a fin is a fleshy fin found on some fish that is located between the dorsal fin and the caudal fin.

Members of the Halosauridae family have eel-like bodies and are found in very deep offshore ocean waters.

Deep-sea spiny eels have a long, slightly taped body. They live in offshore waters around the world and are found at depths of 400-11,000 feet!