Cutlass fish, common name for any of a group of long, thin-bodied fishes found in tropical and subtropical oceans, mostly in deep water.
Scientific classification: Cutlass fish are members of the Trichiuridae family, in the perch order Perciformes. The Atlantic cutlass fish is classified as Trichiurus lepturus and the Pacific cutlass fish as Trichiurus nitens.
The cutlass fish has a pointed snout, a long dorsal (back) fin that extends the length of its body, and a tapered thin tail. Its numerous teeth are large and sharp. Eel-like in appearence