From its Wikipedia page:
"Krill are often referred to as light-shrimp because they can emit light, produced by bioluminescent organs. These organs are located on various parts of the individual krill's body: one pair of organs at the eyestalk, another pair on the hips of the second and seventh thoracopods, and singular organs on the four pleonsternites."
Antarctic krill was created in 1850.
Euphausia
Krill are measured in tonnes, and the number is large enough to outweigh any of their predators. Krill are a key to the Antarctic food chain in Antarctic waters.
There is no commercial krill fishing in the oceans that surround the Antarctic continent -- the Antarctic Treaty forbids it.
krill
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Krill survive in the Southern Ocean which surrounds the Antarctic continent.
Fish, krill, copepods.
Too many to count.
Absolutely nothing. Antarctic krill are massively abundant. They are on of the most abundant creatures on the planet. Dont worry about them.
pouched lamprey,toothfish, murray cod, icefish,plunderfish
Antarctic fur seals typically feed on krill, squid and fish.