Krill are shrimp-like marine invertebrate animals. These small crustaceans are important organisms of the zooplankton, particularly as food for baleen whales, mantas, whale sharks, crabeater seals and other seals, and a few seabird species that feed almost exclusively on them. Krill occur in all oceans of the world. They are considered keystone species near the bottom of the food chain because they feed on phytoplankton and to a lesser extent zooplankton, converting these into a form suitable for many larger animals for whom krill makes up the largest part of their diet. In the Southern Ocean, one species, the Antarctic Krill, Euphausia superba, makes up a biomass of over 500 million tons, roughly twice that of humans. Of this, over half is eaten by whales, seals, penguins, squid and fish each year, and replaced by growth and reproduction. Most krill species display large daily vertical migrations, thus feeding predators near the surface at night and in deeper waters during the day. Commercial fishing of krill is done in the Southern Ocean and in the waters around Japan. The total global harvest amounts to 150–200,000 tonnes annually, most of this from the Scotia Sea.

Read the rest of this article: http://en.wikipedia.org/wiki/Krill

_______________________________ Today's selected anniversaries:

1854: In his Apostolic constitution Ineffabilis Deus, Pope Pius IX proclaimed the dogmatic definition of Immaculate Conception, which holds that the Virgin Mary was born free of original sin. (http://en.wikipedia.org/wiki/Immaculate_Conception)

1941: World War II: Takashi Sakai and the Imperial Japanese Army invaded Hong Kong and quickly achieved air superiority by bombing Kai Tak Airport. (http://en.wikipedia.org/wiki/Battle_of_Hong_Kong)

1980: Mark David Chapman fatally shot former Beatle John Lennon outside the Dakota apartments in New York City. (http://en.wikipedia.org/wiki/Mark_David_Chapman)

1991: Leaders of Belarus, Russia and Ukraine met to dissolve the Soviet Union and establish the Commonwealth of Independent States. (http://en.wikipedia.org/wiki/Commonwealth_of_Independent_States)

_____________________ Wiktionary's Word of the day:

oblation: The offering of worship, thanks etc. to a deity. (http://en.wiktionary.org/wiki/oblation)

_____________________ Wikiquote of the day:

A hero is someone who rebels or seems to rebel against the facts of existence and seems to conquer them. Obviously that can only work at moments. It can't be a lasting thing. That's not saying that people shouldn't keep trying to rebel against the facts of existence. Someday, who knows, we might conquer death, disease and war. -- Jim Morrison (http://en.wikiquote.org/wiki/Jim_Morrison)