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In Moldova, 58 % and 42 % of the river sites belonged to the two highest classes for BOD and ammonium concentration, respectively. The highest average levels were found for sites in the Dniester RBMUs. Average levels of ammonium concentration were far higher here than in the other RBMUs, and 67 % of the sites in Moldova were above the EU Fish Directive recommendation for cyprinid fish. Across all river basins 47 % of the river sites were above the recommended level.