What does pelagic mean?
Pelagic means relating to the open ocean, especially the sunlit and upper waters beyond the continental shelf. The term is used in marine biology, oceanography, and fisheries to describe organisms that live freely in open water rather than on the sea floor or close to a coastline. Pelagic fish such as tuna and mackerel swim through the upper water column and are commonly contrasted with bottom-dwelling or near-shore species. The word can also evoke the immense scale and remoteness of the open sea, which makes it useful in scientific writing and occasionally in literary descriptions. It should not be used as a general replacement for “marine,” since it carries the more specific sense of inhabiting open ocean waters. The related term “benthic” describes the contrasting sea-floor environment.
Relating to or inhabiting the open ocean, especially the upper layers of water beyond the continental shelf.
"The scientists collected samples from the pelagic region of the Atlantic."
Most common in marine biology, oceanography, fisheries, and related technical writing.
A fish or other marine organism that lives in open water, rather than on the sea floor or close to shore.
"The fishery targets pelagics such as tuna and swordfish."
Usually used in the plural and chiefly in fisheries or marine biological contexts.
The sea has two great worlds: the pelagic realm of open water and the benthic realm of the ocean floor.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does pelagic come from?
The word comes from Greek pelagikos, meaning “of the sea” or “belonging to the open sea,” ultimately from pelagos, “sea.” It entered English in the early 19th century in scientific and geographical contexts. Its use expanded with the study of ocean zones, and it became especially common in marine biology for describing free-swimming life in the open ocean.
Related word forms
How pelagic is actually used
The word is primarily technical, especially in marine biology and oceanography. It is not a general synonym for every organism or activity associated with the sea: it specifically evokes the open-water environment above the sea floor. In fisheries, “pelagic fish” generally refers to species such as tuna, mackerel, and herring that swim in the water column and are often caught with drifting nets.
Easily confused with pelagic
Pelagic organisms live in the open-water column, whereas benthic organisms live on the sea floor or within bottom sediments.