The pelagic (or open ocean) zone is divided into a number of sub-zones: Epipelagic (surface to 200 m ): the illuminated surface zone where there is enough light for photosynthesis. Because of this, plankton, and the food chain which feeds on it, are in this zone. The top predators are fish such as tuna and many sharks.

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De abyssale of abyssopelagische zone reikt van 4.000 m tot 6.000 m diepte. Dit betekent normaal gesproken tot de oceaanbodem. In deze zone komt geen licht door, zodat de meeste organismen kleurloos en blind zijn. De hadale of hadopelagische zone omvat al het water onder 6.000 m diepte, voornamelijk in oceanische troggen. Over deze zone is zeer ...

The mesopelagic zone (Greek μέσον, middle), also known as the middle pelagic or twilight zone, is the part of the pelagic zone that lies between the photic epipelagic and the aphotic bathypelagic zones. It is defined by light, and begins at the depth where only 1% of incident light reaches and ends where there is no light; the depths of this zone are between approximately …

This is an audio version of the Wikipedia Article:https://en.wikipedia.org/wiki/Pelagic_zone00:02:41 1 Depth and layers of pelagic zones00:03:03 1.1 Epipelag...