The Antarctic Krill (Euphausia superba) is the best known of the 85 species of krill. Although only 6cm in length, they form a vital link in a long and rich food chain.
Krill swim in huge swarms (thousands of meters across at densities of thousands per square meter) feeding on diatoms (usually seen as a yellowish colour in sea ice), algae and phytoplankton. They are in turn eaten by seabirds, fish, seals and whales (a baleen whale can eat tons of krill each day).
Commercial fishing of krill started in 1977, and like other marine animals is regulated by the Conservation Committee Antarctic Marine Living Resources. Krill meat is sold in many forms and appears as pink coloured tofu. Krill needs to have its shell removed within a few hours of catching else the meat is contaminated by flouride bleaching.