Deep-sea Hatchetfish (juvenile) - Argyropelecus olfersi
This bizarre fish commonly called Deep-sea Hatchetfish, and scientifically named Argyropelecus olfersi (Stomiiformes - Sternoptychidae), is a species of deep sea fish which live in depths up to 800 m, but during the night they rise to shallower water layers up to 100 m below the surface. As an adaptation to their bathypelagic life their body is laterally compressed, they have big tubular eyes directed dorsally, and on the ventral side a series of pigmented photophores (luminous organs) that emit bright flashes.
This species is known to occur in the North and South Atlantic Ocean, and the South Pacific Ocean.
Photo credit: ©Solvin Zankl | Locality: