How We Know

Creature reference

Hadal snailfish

Liparidae (hadal species) · 6,000–8,336 m

Reference answer

Soft-bodied fishes that include the deepest fish yet confirmed on video.

Adaptations

  1. No scales
  2. Soft, pressure-tolerant body plan
  3. Specialized physiology for trench depths

Depth zones

Hadal ZoneThe trench zone: narrow, extremely deep habitats with specialized communities and the ocean’s highest pressures.

Evidence

Sources reviewed

  1. What is the deepest-living fish?NOAA Ocean Exploration · checked 2026-07-30
  2. Animals of the DeepMonterey Bay Aquarium Research Institute · checked 2026-07-30