Antarctic krill

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Antarctic krill, Euphausia superba, is a species of krill found in the Antarctic waters of the Southern Ocean. Antarctic krill are shrimp-like invertebrates or crustaceans that live in large schools, called swarms, sometimes reaching densities of 10,000–30,000 individual animals per cubic meter.[1] They feed directly on minute phytoplankton, thereby using the primary production energy that the phytoplankton originally derived from the sun in order to sustain their pelagic (open ocean) life cycle.[2] They grow to a length of 6 centimetres (2.4 in), weigh up to 2 grams (0.071 oz), and can live for up to six years. They are a key species in the Antarctic ecosystem and are, in terms of biomass, probably the most abundant animal species on the planet (approximately 500 million tonnes).[3]

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