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Euphausiacea
Meganyctiphanes norvegica2.jpg
Northern krill
Scientific classification
Kingdom:
Phylum:
Subphylum:
Class:
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Euphausiacea
Families
Krill anatomy explained, using Euphausia superba as a model

Krill are small shrimp-like crustaceans about an inch or so long, found in all the oceans of the world. In areas with nutrients, they occur in huge swarms, with more than 10,000 krill per cubic meter. They feed on phytoplankton and to a lesser extent zooplankton.

Krill are ecologically very important, because they are near the bottom of the food chain. They make up the largest part of the diet of many animals. In the Southern Ocean, one species, the Antarctic krill, Euphausia superba, makes up an estimated biomass of over 500,000,000 tonnes (490,000,000 long tons; 550,000,000 short tons), roughly twice that of the human race. They are eaten by many animals, including whales, seals, penguins, birds, fish, squid, and whale sharks. Of this, over half is eaten by each year, and is replaced by growth and reproduction.

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