Solvin Zankl / Pacific hatchetfish (Argyropelecus affinis) portrait

David Shale / Greater silver hatchet fish (Argyropelecus gigas) Mid-Atlantic Ridge, North Atlantic Ocean

Norbert Wu / Viperfish (Chauliodus sp) chasing Hatchetfish (Sternoptyx sp) deep sea

David Shale / Deep sea Hatchet fish {Sternoptychidae} Atlantic ocean

David Shale / Greater silver hatchet fish (Argyropelecus gigas) head profile, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Ventral view of Hatchet Fish {Argyropelecus hemigymnus} from 2666 - 0m, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Close up of abdomen of Greater silver hatchet fish (Argyropelecus gigas) showing ventral light organs, Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Greater silver hatchet fish (Argyropelecus gigas) Mid-Atlantic Ridge, North Atlantic Ocean

David Shale / Hatchet Fish {Argyropelecus hemigymnus} from 2666 - 0m, Mid-Atlantic Ridge, North Atlantic Ocean

Jane Burton / Marbled hatchetfish {Carnegiella strigata} resting at surface, captive, tropical

Jane Burton / Marbled hatchetfish {Carnegiella strigata} resting at surface amongst floating water fern {Salvinia sp} captive, tropical

Solvin Zankl / Deep-sea hatchetfish {Argyropelecus olfersi} Atlantic ocean