Abiotic and biotic water parameters (A − P) and trophic state indices (Q and R) (TSI SD − trophic state index based on Secchi disc transparency, TSI Chl a − trophic state index based on the concentration of chlorophyll a in water and TSI TP − trophic state index based on total phosphorus in water) during the spring (day 1–day 42) and summer (day 1–day 43) colonization period in 2010. Parameters and indices: (A) Danube water level, (B) lake depth, (C) water transparency, (D) water temperature, (E) dissolved oxygen, (F) pH, (G) conductivity, (H) chlorophyll a in water, (I) total suspended solids, (J) particulate inorganic matter, (K) particulate organic matter, (L) ammonium, (M) nitrates, (N) nitrites, (O) total nitrogen, (P) total phosphorus, (Q) trophic state indices during spring colonization period, (R) trophic state indices during summer colonization period. Only (A) refers to the Danube, all the others (B − R) refer to the Lake Sakadaš.