What is the mesopelagic zone, or “twilight zone” (200 to 1,000 metres depth),?

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The mesopelagic zone, or “twilight zone” (200 to 1,000 metres depth), is home to dense communities of lanternfishes and deep-sea shrimps that migrate vertically, driving the biological carbon pump.
Epipelagic (Sunlight Zone)
0 – 200 metres
Mesopelagic (Twilight Zone)
200 – 1,000 metres (Lanternfishes)
Bathypelagic (Midnight Zone)
1,000 – 4,000 metres