Common carp are hugely popular in aquaculture, course angling, commercial fisheries and as an ornamental fish. While their native range extends from the lakes and rivers of Japan to the Danube Basin in Eastern Europe, their usefulness has led to them being introduced to many waterways outside their native range. In this book, the authors present topical research in the study of the habitat, management and diseases of carp. Included in this compilation are the strategic management of the photoperiodic schedule and melatonin profile in the regulation of carp reproduction; invasive parasites of common carp in Europe; impacts of the common carp on freshwater ecosystems and the utilisation of carbon, nitrogen and phosphorus in carp culture ponds..