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Transcript of Ocean Zones
Sharks, Dolphins and Jellyfish
Epipelagic Zone Animals
Below the epipelagic zone is the mesopelagic zone, extending from 200 meters to 1000 meters. The mesopelagic zone is sometimes referred to as the twilight zone or the midwater zone. The light that penetrates to this depth is extremely faint. It is in this zone that we begin to see the twinkling lights of bioluminescent creatures. The temperatures are cold in the mesopelagic zone and decrease with depth. The salinity level is 33%. Some of the animals in this depth have a feature where they can produce their own light (bioluminescent). They have a special organ called photophores that have a glowing bacteria that gives off a blue-green light.
Crabs, Octopus, Zooplankton
The next layer is called the bathypelagic zone. It is sometimes referred to as the midnight zone or the dark zone. This zone extends from 1000 meters down to 4000 meters. Here the only visible light is that produced by the creatures themselves. The water pressure at this depth is immense, reaching 5,850 pounds per square inch. In spite of the pressure, a surprisingly, a large number of creatures can be found here. Sperm whales can dive down to this level in search of food. Most of the animals that live at these depths are black or red in color due to the lack of light. The temperature is 39 degrees Fahrenheit and the salinity level is somewhat high because the temperature of the water is cold.
Since there is hardly light, there is no plant life. Some animals in this zone are viperfish, gulper eel, and deep sea anglerfish.
Bathypelagic Zone Life
The next layer is called the abyssopelagic zone, also known as the abyssal zone or simply as the abyss. It extends from 4000 meters to 6000 meters. The name comes from a Greek word meaning "no bottom". The water temperature is near freezing, and there is no light at all. Very few creatures can be found at these crushing depths. Most of these are invertebrates such as basket stars and tiny squids. The salinity level is 34.8 ppt.
Some of the animals in this zone include the giant squid, black swallower, and tripod fish.
Hadalpelagic Zone Life
Beyond the abyssopelagic zone lies the forbidding hadalpelagic zone. This layer extends from 6000 meters to the bottom of the deepest parts of the ocean. These areas are mostly found in deep water trenches and canyons. The temperature of the water is just above freezing. It is pitch black in this zone. The salinity level is 36 ppt.
Animals include the spook fish,the black dragon fish, and the Piezophilic bacteria.