ESTIMATION OF GROWTH PARAMETERS AND MORTALITY RATE FOR COMMON CARP AND PRUSSIAN CARP FROM DANUBE DELTA.

The purpose of this study was to determine the relationships between total length and weight (L - W), to estimate the growth parameters (von Bertalanffy) L∞, k, and the mortality rates (Z, M, F) for the common carp (Cyprinus carpio, Linneaus, 1758) and Prussian carp (Carassius gibelio, Bloch, 1782). Sampling was carried out monthly, from March to September 2021. The relationship between length - weight (L - W) in the study period for common carp was W=0.0574×Lt2.6437, respectively W=0.0391× Lt2.7831 for Prussian carp. The growth parameters for common carp were L∞=86.10 cm and K = 0.87 per year, respectively L∞= 40.95 cm and K 0.67 per year, for Prussian carp. The total (Z), natural (M) and fishing (F) mortality rates were 1.47, 0.82 and 0.65 per year, for common carp, respectively Z=1.65, M=0.85 and F=0.80 for Prussian carp. Regarding the exploitation rate (E) this was 0.44 for the common carp population, respectively 0.48 for Prussian carp, suggesting that both fish population were not in over-exploited condition. [ABSTRACT FROM AUTHOR]