pelagic etymology

Etymology:

The word "pelagic" comes from the Greek word "pelagos," which means "sea" or "open ocean."

Meaning:

Pelagic refers to organisms that live in the open ocean, away from the coast and the bottom of the sea. They are not associated with the seafloor or any other substrate.

Origin:

The term "pelagic zone" was first coined by the Danish marine biologist Johannes Schmidt in 1902. He defined it as the part of the ocean that is not shallower than 200 meters and does not contain any fixed structures, such as seamounts or islands.

Categories of Pelagic Organisms:

Pelagic organisms can be classified based on their depth of occurrence:

  • Epipelagic: Occurs in the upper 200 meters of the water column
  • Mesopelagic: Occurs between 200 and 1,000 meters
  • Bathypelagic: Occurs between 1,000 and 4,000 meters
  • Abyssopelagic: Occurs between 4,000 and 6,000 meters
  • Hadalpelagic: Occurs deeper than 6,000 meters

Examples of Pelagic Organisms:

  • Fish (e.g., tuna, sharks, billfish)
  • Whales
  • Dolphins
  • Sea turtles
  • Krill
  • Plankton
  • Jellyfish

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