The main aims of CCAMLR are reviewed in an essay which discusses the advances in the effectiveness of harvesting, arising from developments in science and technology in comparison with the requirements of science to provide information for rational management. It is concluded that co-operation is essential between fishermen and scientists to ensure the provision of the data needed to test hypotheses related to the functioning of the Southern Ocean ecosystem. Although currently co-operation is fairly good it would be improved by an increased spirit of trust between the various parties.