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Most krill are swarming animals; the sizes and densities of such swarms vary by species and region. For Euphausia superba , swarms reach 10,000 to 60,000 individuals per cubic metre. [ 63 ] [ 64 ] Swarming is a defensive mechanism, confusing smaller predators that would like to pick out individuals.
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 ]
They swarm and mostly feed on plankton. This group is composed of only 90 species, some of which are the most abundant species on the planet; in fact, it is estimated that the biomass of the Antarctic krill Euphausia superba' is 500 million tons.
When disturbed, a swarm scatters, and some individuals have even been observed to moult instantaneously, leaving the exuvia behind as a decoy. [121] In 2012, Gandomi and Alavi presented what appears to be a successful stochastic algorithm for modelling the behaviour of krill swarms. The algorithm is based on three main factors: " (i) movement ...
Euphausia is the largest genus of krill, and is placed in the family Euphausiidae.There are 31 species known in this genus, including Antarctic krill (Euphausia superba) and ice krill (Euphausia crystallorophias) from the Southern Ocean, and North Pacific krill (Euphausia pacifica) in the Pacific Ocean.
Euphausia crystallorophias is a species of krill, sometimes called ice krill, [1] crystal krill, [2] or Antarctic coastal krill. [2] It lives in the coastal waters around Antarctica , further south than any other species of krill. [ 2 ]
Micronekton typically ranges in size from 2 to 20 cm, macro-zooplankton from 2 mm to 2 cm, meso-zooplankton from 0.2 to 2 mm and micro-zooplankton from 20 μm to 0.2 mm. Micronekton represents 3.8-11.8 billion tons of mesopelagic fishes worldwide, [3] [4] approximately 380 million tons of Antarctic krill in the Southern Ocean [5] and a global ...
Bentheuphausia amblyops, the deep sea krill is a species of krill. B. amblyops is the only species within its genus, [ 3 ] which in turn is the only genus within the family Bentheuphausiidae . [ 4 ] All the 85 other species of krill known are classified in the family Euphausiidae .