Study of the relationship the height with the weight and case factor of some bony fish caught from the Tigris river near the Samarra city, Salah al-din province, Iraq

Abstract

The current study was conducted the west of the Tigris river in the Abbasiyya and Raqqa regions in the Samarra city / Iraq, for the period from July 2018 to June 2019. The studied species differed in  the regression coefficient values (b) for the logarithmic relationship between the total length and total weight which ranged between Luciobarbus Xanthopterus 0.26 and Leuciscus vorax 3.91, also it was The Arabibarbus grypus, Planiliza abu and Cyprinus carpio indicate growth symmetry value (b) 3.07, 3.08 and 3.08 respectively in the first station, while in the second station the regression coefficient values (b) ranged from 2.22 in Planiliza abu and 3.35 in Tilapia zillii,while in C. macrostomum, Carassius auratus, Carasobarbus luteus, C. nasus, and Cyprinion kais were all indicating growth symmetry which recorded the (b) values 3.01, 3.02, 3.04, 3.06 and 3.09 respectively. the case factor (K) values were ranged between 0.69 - 2.03 in the Cyprinus carpio and the Leuciscus vorax respectively in the first station, while in the second station, the values of (K) showed 0.21 - 2.11 in Mastacembelus mastacembelus and in Tilapia zillii respectively .