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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 that live in large schools, called swarms, sometimes reaching densities of 10,000 - 30,000 animals per cubic metre. They are herbivorous feeding 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. They grow to a length of 6 cm, weigh up to 2 grams, and can live for up to six years. They are a key species in the Antarctic ecosystem and are likely to be the most successful animal species on the planet in terms of biomass (approximately 500 million tonnes).

More on Antarctic krill They have large brown eyes and a translucent reddish shell. Female Krill can lay up to 10,000 eggs at a time. And they are used to produce krill oil and krill meal which is used for animal feed. As a prey, they are important part of the marine ecosystem, acting as a food source to predators like Wild Salmon. Krill can survive for a long period without foods, but they will become shrink in length.