In 2021-2022, the biological characteristics of Pike perch (Sander lucioperca) were investigated in Aydar-Arnasay Lake System in the middle stream of the Syrdarya River in Uzbekistan. The ages, total lengths and weights of the samples ranged between 1 to 6 years, 23.9 to 71 cm, and 72 to 3030 g, respectively. The formula of dorsal fin rays was XIII-XV, II-III 19-22, of anal fin rays II–III, 11 – 12; 87 - 103 scales in lateral line were determined. The presence of 10 - 13 pyloric appendages was revealed at the Pike perch. Indexes of plastic characteristics are given. The mean back-calculated total length was 24.2 cm at an age I; 36.7 cm, II; 45.9 cm, III; 52.0 cm, IV; 57.2 cm, V; 63.1 cm, VI; 71.0 cm, VII. Males and females achieve first maturation in the 2nd year when the standard body length is reached 33 - 39 cm. Spawning lasts from the third decade of March until the middle of April at a water temperature of 12 - 16 °C. Individual absolute fecundity of 33 - 71 cm females was 51.1 – 1259.9 thousand eggs.