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The mesopelagic (Greek
Greek language

Greek is an Indo-European languages native to the southern Balkan peninsula, the language of the Greek people. It forms an independent branch within Indo-European....
 µ?s??, middle) (also known as the middle pelagic or twilight zone) is a pelagic zone
Pelagic zone

Any water in the sea that is not close to the bottom is in the pelagic zone. The word pelagic comes from the Greek language p??a??? or p?lagos, which means open sea....
 extending from 200 m (650 ft.) down to around 1000 m (3280 ft.) below sea level. It is located between the photic
Photic zone

The photic zone or euphotic zone is the depth of the water in a lake or ocean, that is exposed to sufficient sunlight for photosynthesis to occur....
 epipelagic and the aphotic
Aphotic zone

The aphotic zone is the portion of a lake or ocean where there is little or no sunlight.It is formally defined as the depths beyond which less than 1% of sunlight penetrates....
 bathypelagic, where there is no light
Light

Light, or visible light, is electromagnetic radiation of a wavelength that is Visible spectrum to the human eye , or up to 380?750 nm. In the broader field of physics, light is sometimes used to refer to electromagnetic radiation of all wavelengths, whether visible or not....
 at all.






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Wfm Pelagic
The mesopelagic (Greek
Greek language

Greek is an Indo-European languages native to the southern Balkan peninsula, the language of the Greek people. It forms an independent branch within Indo-European....
 µ?s??, middle) (also known as the middle pelagic or twilight zone) is a pelagic zone
Pelagic zone

Any water in the sea that is not close to the bottom is in the pelagic zone. The word pelagic comes from the Greek language p??a??? or p?lagos, which means open sea....
 extending from 200 m (650 ft.) down to around 1000 m (3280 ft.) below sea level. It is located between the photic
Photic zone

The photic zone or euphotic zone is the depth of the water in a lake or ocean, that is exposed to sufficient sunlight for photosynthesis to occur....
 epipelagic and the aphotic
Aphotic zone

The aphotic zone is the portion of a lake or ocean where there is little or no sunlight.It is formally defined as the depths beyond which less than 1% of sunlight penetrates....
 bathypelagic, where there is no light
Light

Light, or visible light, is electromagnetic radiation of a wavelength that is Visible spectrum to the human eye , or up to 380?750 nm. In the broader field of physics, light is sometimes used to refer to electromagnetic radiation of all wavelengths, whether visible or not....
 at all. Although some light penetrates this deep, it is insufficient for photosynthesis
Photosynthesis

File:Seawifs global biosphere.jpgPhotosynthesis is a metabolic pathway that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight....
. Though the temperature varies less at any one height than the epipelagic, the mesopelagic is the location of the thermocline
Thermocline

The thermocline is a thin but distinct layer in a large body of fluid , in which temperature changes more rapidly with depth than it does in the layers above or below....
, with temperatures varying from over 20°C at the top to around 4°C at the boundary with the bathyal zone
Bathyal zone

The bathyal zone or bathypelagic ? from Greek wikt:?a??? , deep ? is the pelagic zone that extends from a depth of 1000 to 4000 meters below the ocean surface....
. Animals such as swordfish
Swordfish

Swordfish , also known as Broadbill in some countries, are large, highly migratory, predatory fish characterized by a long, flat bill. They are a popular sport fish, though elusive....
, squids, wolf eels, cuttlefish
Cuttlefish

Cuttlefish are Marine animals of the order Sepiida belonging to the Cephalopoda class . Despite their common name, cuttlefish are not fish but molluscs....
, and other semi-deepsea creatures live here. Also, there is enough sunlight for animals, such as the chain catshark
Chain catshark

The chain catshark, Scyliorhinus retifer, also called the chain dogfish, is a small, spotted shark that has a characteristic fluorescent activity....
, to be fluorescent.