Abstract
The study was conducted in the Tigris River south of Baghdad for the period from July 2016 to June 2017. The environmental and morphological properties of Coptodon zillii (Gervais, 1848) were recorded and the age, growth and value of the condition factor were determined as far as the fish could reach. Fish were collected by a sample each month with total lengths ranging from 6.1 to 24.4 cm and total weights from 4.48 to 295.32 g. The average temperature was 20-24 C ° and the dissolved oxygen rate was 8.46 mg / L. The pH was 7.6 and the salinity of the tigris was 0.59 ppm. The total condition factor of the two sexes was 1.165. and reached an expected length of 25.68 cm. The value of (b) 3.124 which indicates the increase in the cube weight at the expense of length. The number of gil reckers was 10-16, the fin spine (Dorsal fin) was 14-15, and the soft rays Dorsal fin 11-13 and fin spin anal fin ranged from 3 to 3 and the number of anal fin rays from 8-10. The average body depth was 36.18, while the average head length was 30.43 and its height was 41.78.
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