Solvin Zankl / Pacific hatchetfish (Argyropelecus affinis) portrait

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

Norbert Wu / Slender Hatchetfish (Argyropelecus affinis) deep sea, San Clemente Basin, California

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

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

Solvin Zankl / Loosejaw fish (Malacosteus niger) with a light organ beneath its eye. Deep sea species in Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Deep sea hatchetfish (Sternoptyx diaphana) profile. Deep sea species from Atlantic Ocean close to Cape Verde. Captive.

Solvin Zankl / Photophores of Diaphanous hatchetfish (Sternoptyx diaphana), photographed from underneath. Deep sea species from Atlantic Ocean off Cape Verde. Captive.

Solvin Zankl / Black dragonfish (Malacosteus niger) deep sea species with a light organ beneath its eye. Atlantic Ocean off Cape Verde. Captive.

MYN / Martin Taylor / Marbled hatchetfish (Carnegiella strigata) close to Manacapuru, Brazil. Meetyourneighbours.net project

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

Solvin Zankl / Juvenile deepsea Hatchetfish {Argyropelecus olfersi}, Atlantic ocean

David Shale / Ventral view of Hatchetfish {Argyropelecus hemigymnus} from the Mid-Atlantic Ridge, 400 - 500m

David Shale / Hatchetfish {Argyropelecus hemigymnus} from the Mid-Atlantic Ridge, 400 - 500m

David Shale / Ventral view of Hatchet fish {Sternoptychidae / Argyropelecus hemigymnus} Atlantic

Norbert Wu / Slender Hatchetfish (Argyropelecus affinis) cleared and stained to show bones (Red) and cartilage (Blue) deep sea

Norbert Wu / Slender Hatchetfish (Argyropelecus affinis) eyes look up, light plates on body counter illuminate creating no shadow, deep sea

Norbert Wu / Slender Hatchetfish (Argyropelecus affinis) cleared and stained to show bones (Red) and cartilage (Blue) deep sea

DOC WHITE / Lowcrest hatchetfish {Argyropelecus slandeni} - deep sea specimen

Peter Scoones / Hatchetfish shoal, Indo-Pacific

Solvin Zankl / Hatchetfish (Maurolicus walvisensis) close up of photophores beneath its body, emitting bioluminescent light. This glow, directed downward through light-guides, likely serves as counterillumination vi...

Solvin Zankl / Hatchetfish (Maurolicus walvisensis) ventral view portrait, showing photophores beneath its body, emitting bioluminescent light. This glow, directed downward through light-guides, likely serves as cou...

Solvin Zankl / Deep-sea hatchetfish (Maurolicus walvisensis) portrait, showing bioluminescent organs along the underside of its body. These fish inhabit the mesopelagic zone of the open sea, typically at depths of 1...

Solvin Zankl / Pacific hatchetfish (Argyropelecus affinis) portrait exhibiting bioluminescence. It resides in the mesopelagic zone. Observed during RV Sonne, Cruise SO285, South Atlantic's Benguela upwelling re...

Solvin Zankl / Scaly dragonfish (Stomias boa) head portrait, showing distinctive long barbel under the lower jaw, observed during RV Sonne, Cruise SO285, in the South Atlantic, specifically in the Benguela upwelling...

David Shale / Deepsea fish {Stomias boa} with lure, deep sea Atlantic ocean