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Pelagic zones
The mesopelagic (Greek μέσον, middle) (also known as the middle pelagic or twilight zone) is a pelagic zone extending from 200 m down to around 1000 m below sea level. It is located between the photic epipelagic and the aphotic bathypelagic, where there is no light at all. Although some light penetrates this deep, it is insufficient for photosynthesis. Though the temperature varies less at any one height than the epipelagic, the mesopelagic is the location of the thermocline, with temperatures varying from over 20°C at the top to around 4°C at the boundary with the bathyal zone. Animals such as swordfish, squids, wolf eels, cuttlefish, and other semi-deepsea creatures. also, there is enough sunlight for animals, such as the chain catshark, to be fluorescent.
Greek}}} 
Writing system: Greek alphabet 
Official status
Official language of:  Greece
 Cyprus
 European Union
recognised as minority language in parts of:
 European Union
 Italy
 Turkey
Regulated by:
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The pelagic zone is the part of the open sea or ocean that is not near the coast. In contrast, the neritic zone comprises the water that is near to (and is significantly affected by) the coast or the continental shelf.
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The photic zone or euphotic zone (Greek 'well lit') is the depth of the water whether in a lake or an ocean, that is exposed to sufficient sunlight for photosynthesis to occur. The depth of the euphotic zone can be greatly affected by seasonal turbidity.
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The pelagic zone is the part of the open sea or ocean that is not near the coast. In contrast, the neritic zone comprises the water that is near to (and is significantly affected by) the coast or the continental shelf.
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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.
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The bathyal zone or bathypelagic is the pelagic zone that extends from a depth of 1000 to 4000 meters below the ocean surface. It lies between the mesopelagic above, and the abyssopelagic below.
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Light is electromagnetic radiation of a wavelength that is visible to the eye (visible light). In a scientific context, the word "light" is sometimes used to refer to the entire electromagnetic spectrum.
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The thermocline (sometimes metalimnion) is a layer within a body of water or air where the temperature changes rapidly with depth.

Oceans



Because water is not perfectly transparent, almost all sunlight is absorbed in the surface layer, which heats up.
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The bathyal zone or bathypelagic is the pelagic zone that extends from a depth of 1000 to 4000 meters below the ocean surface. It lies between the mesopelagic above, and the abyssopelagic below.
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Xiphiidae

Genus: Xiphias

Species: X. gladius

Binomial name
Xiphias gladius
Linnaeus, 1758


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For other uses, see Squid (disambiguation).


Superconducting Quantum Interference Devices (SQUID) are very sensitive magnetometers used to measure extremely small magnetic fields, based on superconducting loops
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Sepiida
Zittel, 1895

Suborders and Families
  • †Vasseuriina
  • †Vasseuriidae
  • †Belosepiellidae
  • Sepiina

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S. retifer

Binomial name
Scyliorhinus retifer
(Garman, 1881)

The chain catshark, Scyliorhinus retifer, also called the chain dogfish
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Fluorescence is a luminescence that is mostly found as an optical phenomenon in cold bodies, in which the molecular absorption of a photon triggers the emission of another photon with a longer wavelength.
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