Animals capable of moving independent of the ocean currents, by swimming or other means of propulsion, are called nektons.
Living things with the ability to move and swim without the aid of currents are called nekton (or swimmers). Fish, squid, octopuses, sharks, and other well-known marine mammals are examples of nekton, which are heterotrophic and have a wide size range. Nekton typically exist in the water column as pelagic organisms, although some of them are demersal and dwell at the bottom in both coastal and oceanic environments.
Nekton can impinge on intake system screens in a seawater desalination plant or become caught inside the system, limiting feedwater extraction and hindering the desalination process. The most abundant and biodiverse nekton are fish, followed by cephalopods. Marine reptiles, marine mammals, and some crustaceans are additional nektonic groups.
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