Crestfish

Crestfishes
North Pacific crestfish
Lophotus capellei
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Lampriformes
Family: Lophotidae
Genera

Eumecichthys
Lophotus

Crestfishes are lampriform fishes in the family Lophotidae. They are elongated, ribbon-like fishes, silver in color, found in deep tropical and subtropical waters worldwide. Their scientific name is from Greek lophos meaning "crest" and refer to the crest (part of the dorsal fin) that emerges from the snout and head; this structure gives them their other name of unicorn fishes.

They possess ink sacs that open into their cloacae from which they can produce a cloud of black ink when threatened (as in many cephalopods).

References