Common carp
Common carp contributed around 4.67 million tons on a global scale during 2015–2016, roughly accounting for 7.4% of the total global inland fisheries production. In Europe, common carp contributed 1.8% (0.17 Mt) of the total inland fisheries production (9.42 Mt) during 2015–2016. It is a major farmed species in European freshwater aquaculture with production localized in central and eastern European countries. The Russian Federation (0.06 Mt) followed by Poland (0.02 Mt), Czech Republic (0.02 Mt), Hungary (0.01 Mt) and Ukraine (0.01 Mt) represents about 70% of carp production in Europe during 2016. In fact, the land‐locked central European countries rely heavily on common carp aquaculture in fishponds. The average productivity of carp culture systems in central European countries ranges between 0.3 and 1 ton ha−1. The European common carp production, in terms of volume, reached its peak (0.18 Mt) during 2009–2010 and has been declining since. Carp farming is often criticized as an anthropogenic driver of eutrophication of inland freshwater bodies - especially in the Central Eastern European Region (CEER). There has been some debate between environmentalists and carp farmers concerning eutrophication of water bodies, manifested into lobbying at ministry levels surrounding fishpond legislations. European carp aquaculture in fish ponds most likely has the least nutrient burden to the environment than most food production sectors in the European Union.