The present work aimed at conducting a comparative study of the chemical components of the muscles of four teleosts in two different regions of each Coptodon zillii belonging to the Cichlidae and members of Cyprinidae, Carabarbus luteus, Cyprinus carpio and Cyprinion macrostomum. This study concentrated on the determination of differences in the values of the chemical components of the muscles and calories for protein and lipid contents. In addition to this, it concentrated on the determination of the nutritional value of the studied fish. Samples were collected between November / 2018 and January / 2019 from Al-Hindiyia market in Karbala province, Iraq. The results showed that the protein content was higher in the region 1 (R1] compared to the region 2 (R2] while the lipid content of the R2 was higher than that for the R1. These results were associated with the red muscle ratio in the two regions. The total protein content was recorded 19.69% in C. zillii, 25.42% in C.luteus, 21.92% in C. carpio and 23.51% in C.macrostomum while the total lipid content was 4.25% in C. zillii, 2.23% in C. luteus, 4.10% in C. carpio and 6.42% in C. macrostomum. Therefore, the statistical results indicated significant differences (P<0.05] between the studied species in protein and lipid contents, while the differences were not significant (P>0.05] among the C.zillii, C.luteus and C.carpio in the values of moisture content and between the C.luteus and C.macrostomum in ash content values. According to the lipid content values in the studied fish muscles, the C. luteus fish (2.23%] were in a low-lipid fish while the C.carpio (4.10%], C.zillii (4.52%] and C.macrostomum fish(6.24%] were in a medium-lipid fish.

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The present study dealt with the determination of the protein, fat, moisture and ash chemical content for two species of bony fish (Teleosts) that belonged to two different families, namely Acanthopagrus latus (Sparidea) and Coptodon zilli ( Cichlidae). Also, the total energy (calories) to the protein and fat contents in the muscles of the two studied fish and for two regions for each species. Samples were collected from the Al-Hindiya river in Karbala Province between August and October 2020. The current results noted an apparent difference in the mean values of chemical contents for the studied length groups, which ranged between 100-400 mm, and for two regions of the body, as the rates of protein content in A. latus were 17.42-18.60% while their rates ranged in C. zilli between 17.20-18.54%. The rates of fat content in A. latus were 6.40-7.50%, whereas ranged between 5.70-6.30% in C. zilli and the rates of moisture content ranged from 74.60 to 70.16%, while In C. zilli fish, the rates ranged between 75.40-72.40%, and the ash content ranged from 1.42 to1.80% and 1.14-1.34% in A. latus and C. zilli fish respectively. Both fish were considered medium-fat content fish depending on its value in their muscles. Keywords: nutritional value; fish muscles; Coptodon zilli; Acanthopagrus latus .