The pike (Esox lucius Linnaeus 1758), or northern pike in North America, is a well-known fish species to anglers, managers, and scientists. As the only northern hemisphere circumpolar species represented in the family Esocidae, pike are studied in many different countries and cultures. The pike’s broad distribution in rivers and lakes throughout Eurasia and North America, trophic position as a top carnivore, effects on prey communities, and value in recreational and commercial fisheries, highlight its importance over countless, and varied aquatic systems. Complexity surrounds this species, with concern over the status of natural pike populations in some areas of its range, as well as its effects on ecosystems and fish communities, where it is endemic or has been introduced. Altered recruitment processes associated with changes and losses in critical habitats and flow regime characteristics, water quality declines, and climate change threatens this species worldwide. A general interest exists in the role of pike in fish communities and aquatic systems as well as in the effective management of recreational and commercial fisheries. Much can be learned from a symposium with a comprehensive focus by experts regarding pike life history, behavior, habitat use and requirements, population dynamics, physiology, role in ecology, and management issues. This symposium was envisioned by a group of scientists at the 2004 conference ‘‘Behavior and ecology of freshwater fish: linking ecology and individual behavior’’ hosted by the Danish Institute for Freshwater Research in Silkeborg, Denmark. Such an opportunity was given at the 136th annual meeting of the American Fisheries Society in Lake Placid 2006. A two-day symposium entitled ‘‘International Pike Symposium: merging knowledge of ecology, biology, and management for a circumpolar species’’ comprised 28 presentations by researchers from seven countries covering a variety of pike topics, and two panel discussions on the management and the ecology of pike. The objective of this symposium was to create and facilitate information exchanges regarding northern Guest editors: J. M. Farrell, C. Skov, M. Mingelbier, T. Margenau & J. E. Cooper International Pike Symposium: Merging Knowledge of Ecology, Biology, and Management for a Circumpolar Species