Relationships between fish indicators and total phosphorus concentration. First two columns share y-axis. A = total fish biomass in dam part, B = total fish biomass in tributary part, C = total fish abundance, D = relative biomass of common bream, E = relative abundance of ruffe, F = relative biomass of European perch, G = relative biomass of rudd, H = relative biomass of Salmonidae (black circles reservoirs < 700 m a s l and empty circles ≥ 700 m a s l), I = presence of 0+ fish of six species.