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Krill (Euphausiids) [1] (sg.: krill) are small and exclusively marine crustaceans of the order Euphausiacea, found in all of the world's oceans. [2] The name "krill" comes from the Norwegian word krill , meaning "small fry of fish", [ 3 ] which is also often attributed to species of fish.
Antarctic krill (Euphausia superba) is a species of krill found in the Antarctic waters of the Southern Ocean. It is a small, swimming crustacean that lives in large schools, called swarms , sometimes reaching densities of 10,000–30,000 animals per cubic metre. [ 3 ]
The krill fishery is the commercial fishery of krill, small shrimp-like marine animals that live in the oceans world-wide. The present estimate for the biomass of Antarctic krill ( Euphausia superba ) is 379 million tonnes. [ 1 ]
It often has spikes on its carapace, which may assist these small organisms in maintaining directional swimming. [36] In many decapods, due to their accelerated development, the zoea is the first larval stage. In some cases, the zoea stage is followed by the mysis stage, and in others, by the megalopa stage, depending on the crustacean group ...
Rod Downie, chief polar adviser at WWF-UK, said: “Antarctic krill are the superheroes of the Southern Ocean. These tiny, unsung heroes are the beating heart of the Southern Ocean, sustaining ...
In particular, the biomass of consumers (copepods, krill, shrimp, forage fish) is larger than the biomass of primary producers. This happens because the ocean's primary producers are tiny phytoplankton which grow and reproduce rapidly, so a small mass can have a fast rate of primary production.
A humpback whale, likely lured by a trawling net capturing masses of Antarctic krill, became entangled last month and died in the Southern Ocean. Scientists say the humpbacks may have been ...
Adult Euphausia lucens measure 10–18 mm (0.39–0.71 in) long. [5] The eyes are large and spherical and the rostrum is noticeably short. There is a small tooth on the lower edge of the carapace, but the abdomen lacks any spines.