The aphotic zone is the portion of a lake or ocean that is not exposed to sunlight. No light other than
bioluminescence is found in this zone. Most food comes from dead organisms sinking to the bottom of the lake or ocean from other zones. The depth of the aphotic zone can be greatly affected by such things as
turbidity and the season of the year. The aphotic zone underlies the
photic zone, which is that portion of the ocean directly affected by sunlight. The aphotic zone of the ocean is 0.9 - 4.6 km (3,000 - 15,000 feet) deep and the temperatures range from 0 - 6°C (32 - 43°F). Unusual and unique creatures dwell in this expanse of pitch black water, such as the
gulper eel, the
giant squid, the
anglerfish, and the
vampire squid.
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