Morphometric and Reproductive Parameters of the Prussian Carp (Carassius gibelio) of Lake Ullishurkul, Uzbekistan

The article presents scientifically substantiated data on the ecological, morphometric and reproductive (individual development) traits and characteristics of the Prussian carp – Carassius gibelio (Bloch, 1782), common in Lake Ullishurkul. Data on the body length and weight of individuals were analyzed. No high variability was revealed in morphometric parameters (coefficient of variation Cv = 12.39). Age groups were also characterized based on the observation results. It was shown that the Fulton condition index and other parameters of the Carassius gibelio population correspond to the current biological conditions of the reservoir. The reproductive parameters of these fish were studied, including the relationship between individual absolute fecundity and body length and weight. It was found that in individuals aged 2+, the length fluctuates within the range of 160- 220mm, and weight is 150- 250g; in individuals aged 3+, the length reaches 190- 250mm, and the weight is 240-395g. The relationship between body length and weight on the T_{st scale} is high (R² = 0.7985), indicating general proportionality. As body length increases, the weight of individuals increases significantly. The regression equation shows that the relationship is exponential with an exponent close to quadratic.