The rudd, Scardinius erythrophthalmus (Linnaeus,1758) is a common freshwater fish species, which widely spread in Europe and middle Asia. S. erythrophthalmus was first reported Lake Uluabat in Turkey by Berg in 1921. This species does not have much economic value but it is important as food for carnivorous fish species living in the fresh water system. The present study aims to determine the population growth of Scardinius erythorphthalmus population in Lake Uluabat (also known as Lake Apolyont).In this study, 417 individuals of S. erythrophthalmus were caught and examined each month between March 2006 and February 2007 by utilizing gill nets in various sizes. By utilizing the measured lengths, weights, and determined ages, the von Bertalanffy growth equations were calculated. Munro’s Phi Prime Test was used in order to compare the calculated equations with previous studiesThe ages of population ranged between I-VII age groups. The percentages of females were 59%, males 32 %and 9 %juvenile out of fish samples. Fork length of females ranged between 13-31.8 cm and 27-478 g in weight; as for males were 12.3-28 cm in length and 22.2-308 g in weight. The length-weight relationship was estimated as W= 0.0087 L3.1782 for females and W= 0.0091 L3.1593 for males. Bertalanffy growth parameters were computed for females as L∞=38.47 cm, W∞=945.01 g, K=0.191318 year-1 and t0= -1.15495 year; for males as L∞= 31.72 cm, W∞= 506.84 g, K=0.309779 year-1 and t0=-0.58332 year.This study presents population structure and growth features of S. erythrophthalmus species in Lake Uluabat, which is one of the most important fish farms in Turkey, and compares growth features with other areas