Krill are relatively small, shrimp like filter-feeding crustaceans important in the diets of many whales, seals, sea birds, fish and squid. In recent years, large-scale krill fishing has been undertaken in the Southern Oceans, in Japanese waters and on a smaller scale in Canadian waters. The harvested krill are converted to a variety of products and marketed as fishmeal, feed for aquaculture and for direct human consumption. Krill, being in the middle of several food chains, present intriguing problems for resource management and have highlighted the need for a thorough ecosystem approach. This important book covers the biology, ecology and commercial exploitation of krill, chapters have been written by international experts providing a vital reference source for all those with an interest in the area.