Cultivation of different densities of common carp ( Cyprinus carpio L.1758 ) in floating cages in the Euphrates River in Nasiriyah city

Abstract

current study was conducted to show the effect of culturing common carp Cyprinus carpio with different densities in floating cages in the Euphrates River in Nasiriyah city, Dhi Qar governorate, on some growth indicators, for a period of (10/17)  2020 until 10/6/2021).  Four different treatments were used in the density of culture (200, 300, 400, 500) respectively, and the average weight ranged between (42-55) g.  Floating cages made of PVC were used, the same diet was used to feed fish for the four treatments.  The results of the current study were evaluated according to growth criteria (total weight gain, daily weight gain, relative growth rate, specific growth rate, food conversion factor, food conversion efficiency, protein efficiency ratio).  The results showed that the first treatment, followed by the second treatment, outperformed the third and fourth treatments.  It was concluded from the current study that the lowest densities of common carb achieve the best rates of growth indicators.