MORPHOLOGY, AGE AND GROWTH OF PRUSSIAN CARP (CARASSIUS GIBELIO) IN TUDAKUL RESERVOIR IN UZBEKISTAN

Abstract

Modern ststae of invasive prussian carp (Carassius gibelio) was studied in Tudakul reservoir (lower stream of Zarafshen River) in 2020-2022. Fins rays formula was D II (III) 16-18, A II 5-6; 26 - 28 scales in lateral line and 38 – 46 gil rakers were determined. Plastic indexes according to tradinional for cyprinids so as indexes of «truss protocol» are given. The ages of the samples ranged between 1 to 5 years, the total length 144.3 – 452.7 mm, the standard lengths 113.3 – 383.0 mm and total weights 99.0 – 703.0 g. The relationship between the total length (TL) and weight (W) was described by W = 0,0192*TL2,957 (r = 0,95). The mean back calculated standard length was 10.7 cm at age I; 18.1 cm, II; 24.4 cm, III;26.1 cm, IV.