I want to know the answer to the following question:
What animal was greatly hunted during the 18th and 19th centuries?
All the background I'm provided with is that "Antarctic krill, which congregate in large schools, is the keystone species of the ecosystem of the Southern Ocean, and is an important food organism for whales, seals, leopard seals, fur seals, squid, icefish, penguins, albatrosses and many other birds.". Is that enough to answer the question?