Every March Pacific Herring migrate to their spawning grounds in the calm waters of Sitka Sound, off Baranof Island in Southeast Alaska. This draws not only the whales, sea lions, and other marine mammals who feed on the fish, but also a fleet of fishermen. The Stika Sac Roe Herring Fishery is a commercial fishery consisting of a handful of opening periods over the span of a few days. The fishery is managed by the Alaska Department of Fish and Game, and a quota is established based on current numbers. A fleet of purse seiner fishing vessels compete for the best fishing spot using the aid of small planes that supply aerial surveillance information on fish school locations to the vessels below.