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mesopelagic zone
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Diagram showing ocean zonation by depth and region, with labeled layers: littoral, sublittoral, bathyal, abyssal, and hadal along the seafloor, and epipelagic, mesopelagic, bathypelagic, and abyssalpelagic in open water. The littoral zone is at the high-tide mark. Vertical scale marks photic and aphotic zones from surface to 10,000 meters.
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mesopelagic zone

oceanography
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Diagram showing ocean zonation by depth and region, with labeled layers: littoral, sublittoral, bathyal, abyssal, and hadal along the seafloor, and epipelagic, mesopelagic, bathypelagic, and abyssalpelagic in open water. The littoral zone is at the high-tide mark. Vertical scale marks photic and aphotic zones from surface to 10,000 meters.
ocean zonation Zonation of the ocean. Note that in the littoral zone the water is at the high-tide mark.

The mesopelagic zone, also known as the twilight zone, is an oceanic layer extending from about 600 feet to 3,000 feet (200 to 1,000 meters) below the surface. This region receives some sunlight, but not enough for photosynthesis. It is part of the larger pelagic zone, which encompasses the entire ocean water column. Life in the mesopelagic zone includes various marine organisms such as eels and fishes. This zone is situated below the photic zone, where sunlight penetrates sufficiently for photosynthesis, and above the bathypelagic zone, which lies in perpetual darkness.1234

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5 Britannica Sources
  1. photic zone
  2. bathypelagic zone
  3. pelagic zone
  4. mesopelagic
  5. marine ecosystem - Links between the pelagic environments and the benthos

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