Some biological characteristics of Carassius gibelio (Bloch, 1782) (Teleostei: Cyprinidae) in the Azad dam Lake in Western Iran

The freshwater Prussian carp, Carassius gibelio (Bloch, 1782) is a cyprinid, known as a hazardous species for native fish communities. In the present study, some population parameters, including length-weight relationship (LWR), condition factor (KF), relation condition factor (Kn), age and growth of C. gibelio in the Azad dam, Kordestan Province, Iran were estimated. The LWR indicating a positive allometric growth pattern. The von Bertalanffy growth parameters were estimated as L∞=337mm, K=0.255 yr-1, t0=-0.21 yr. There was a significantly positive correlation between TL and KF (r2=0.89). The average of Kn was lower than 1 which suggested that the well-being of the fish was not good in the Azad dam region.