nektonic

/nɛkˈtɑnɪk/
adjective
  1. Relating to or characteristic of nekton; describing animals that swim actively in water.
    • The nektonic lifestyle requires strong muscles and fins.
    • Many nektonic species migrate across entire oceans.
    • Nektonic organisms like sharks are powerful swimmers.
Antonyms
What does "nektonic" mean? | whatsthatwordmean | whatsthatwordmean