Nekton
유영생물
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<speciesfyi-glossary slug="nekton"></speciesfyi-glossary>Definition
Aquatic organisms capable of swimming actively against currents, including fish, marine mammals, and squid.
Detailed Explanation
Nekton contrast with plankton in their ability to determine their own position and direction. The boundary is not absolute — large jellyfish can swim weakly but are still considered plankton. Nekton include economically important fisheries species and iconic megafauna. Their movements often span ocean basins: bluefin tuna migrate between Atlantic feeding grounds and Mediterranean spawning grounds, crossing thousands of kilometers.