Krill fishing in the Southern Ocean has raised in acute form the question of wildlife conservation in Antarctica: what will be the effect on the ecosystem? how much krill can be taken? who can take part? what regulations are needed? The author, a scientist of the British Antarctic Survey, considers the answers in the light of the Antarctic Treaty of 1959 and the Canberra Convention on the Conservation of Antarctic Marine Living Resources of 1980, and looks at some criticisms of the latter put forward in a recently published book. He suggests that the Convention, while not ideal, is to be welcomed because it provides a framework for conservation and rational exploitation that can be made to work – if the nations that signed it are determined to make it do so.