Because these fish live in regions where there is no natural illumination, they cannot rely solely on their eyesight for locating prey, mates, avoiding predators and whatnot; Deep sea fish have developed alternative methods to what us land lubbers call everyday survival. Many deep sea fish are bio-luminescent, with extremely large dark-adapted eyes. Some Deep sea fish have long feelers to help them locate prey in the eternal dark of the deep ocean.
The deepsea is also an extremely hostile environment, with pressures between 20 and 1,000 atmospheres (between 2 and 100 megapascals), temperatures between 3 and 10 degrees Celsius, and a lack of carbon dioxide.
Since many of these fish live in regions where there is no natural illumination, they cannot rely solely on their eyesight for locating prey and mates and avoiding predators; deepseafish have evolved appropriately to the extreme sub-photic region in which they live.
Many deepseafish are bioluminescent, with extremely large eyes adapted to the dark, and they can have long feelers to help them locate prey or attract mates in the pitch dark of the deep ocean.
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