Most krill feed on phytoplankton and many are filter feeders. A few species are known to hunt copepods and other zooplankton (Saether, 1986)
They form an important link in the marine food chain. They occur in huge numbers throughout the global oceans and link the algae and zooplankton they feed on to the many larger predators including baleen whales (Tudge, 2000).
- Saether, O., Trond Erling Ellingsen & Viggo Mohr (1986). "Lipids of North Atlantic krill" (PDF). Journal of Lipid Research 27 (3): 274–285
- Tudge, C. The Variety of Life: A survey and celebration of all the creatures that have ever lived. Oxford University Press, 2000. Oxford, United Kingdom.