by Hatchetfish are well camouflaged.
Like many deep sea fishes, they have light-producing organs in rows along their bellies.
These organs shine a pale blue light that matches daylight filtering down from above, and hides them from predators below.
Hatchetfish can regulate the intensity and color of light from these organs to match the light filtering down.
Each species of hatchetfish has its own particular pattern of lights.
Source
Like many deep sea fishes, they have light-producing organs in rows along their bellies.
These organs shine a pale blue light that matches daylight filtering down from above, and hides them from predators below.
Hatchetfish can regulate the intensity and color of light from these organs to match the light filtering down.
Each species of hatchetfish has its own particular pattern of lights.
Source
