Nutrient footprint and ecosystem services of carp production in European fishponds in contrast to EU crop and livestock sectors

There have been some arguments concerning supplementary feed (cereals) based common carp production in fishponds and water pollution, mostly in Central Europe. Using Czech Republic (top producer in EU) as a benchmark and combining data on nutrient digestibility of feedstuffs used combined with analyses of literature data, we have assessed - nutrient footprint (similar to 9.4-10.8 kg N ha(-1), similar to 2.7-3.2 kg P ha(-1); 1.5-4 x < EU crop-livestock sectors); nutrient utilization efficiencies (NUEN similar to 36%, NUEP similar to 50%; 1.5 -1.7 x > EU livestock average); autochthonous nutrient removal (similar to 8-9.2 kg N ha(-1), 1.4-1.6 kg P ha(-1)); eco-cost burden (13-29 x << positive services); eco-services (similar to 74.5-100.6 million (sic) country(-1); similar to 2375 (sic) ha(-1)) of carp production in Central Eastern European Region (CEER). Digestible nutrients offered by natural prey (7.9% N, 1% P on dry matter basis) to carp are similar to 5-8 times higher than those provided by cereals and remains the key determinant for production. Despite this, 70-90% of nutrient footprint from feeding is contributed by cereals. Neutral footprint (similar to 374 kg ha(-1)) and exclusively natural (up to 300 kg ha(-1)) carp production intensities were identified, following which, commercial interest of carp farming may falter (costing intangible losses >56.5 million (sic) in CEER), despite achieving 'greener-goals'. Per production cycle, carp aquaculture in CEER fishponds offer at least 579 million (sic) worth of services. Our results show that carp production in ponds have lesser nutrient burden than crop and livestock productions in EU. Existing management of fishponds 'barely meet' optimum P requirements of common carp and present production intensity should not be vilified as a pollution causing activity. Risks and solutions for achieving both environmental (minimized footprint) and aquaculture goals (uncompromised production) are discussed. (C) 2020 The Authors. Published by Elsevier Ltd.