Not listed by the IUCN. The Antarctic krill biomass, estimated at about 550 million tons (490,000,000 metric tons), may be among the largest of any multi-cellular animal. In response to an explosion of commercial fishing in the 1970s, a treaty called the Convention on the Conservation of Antarctic Marine Living Resources (CCAMLR) was signed in 1981 and took effect in 1982 under the auspices of the Antarctic Treaty System. It sets conservative catch limits in order to protect against over-fishing of krill and encourage recovery of whale populations.
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