Krill vs. Plankton — What's the Difference?

Krill are small crustaceans of the order Euphausiacea, and are found in all the world's oceans. The name "krill" comes from the Norwegian word krill, meaning "small fry of fish", which is also often attributed to species of fish.

Plankton are the diverse collection of organisms found in water (or air) that are unable to propel themselves against a current (or wind). The individual organisms constituting plankton are called plankters.

The collection of small marine crustaceans of the order Euphausiacea that are the principal food of baleen whales.

The small or microscopic organisms that drift or swim weakly in a body of water, including bacteria, diatoms, jellyfish, and various larvae. Plankton is an important food source for fish and other larger organisms.

Any of several small marine crustacean species of plankton in the order Euphausiacea in the class Malacostraca.

(uncountable) Organisms, especially small and microscopic ones, that drift in water.

Shrimp-like planktonic crustaceans; major source of food for e.g. baleen whales

(uncountable) A plankter, any single organism that drifts in water.

All the animals and plants, taken collectively, which live at or near the surface of salt or fresh waters.

The aggregate of small plant and animal organisms that float or drift in great numbers in fresh or salt water