Relationship Study Between Total Length with Otolith Length and Thickness in Two Fish Species: Coptodon zillii (Gervais,1848) and Cyprinus carpio” (Linnaeus,1758)

Abstract

Abstract This study aimed new indications that may clarify the relationships between the total and standard lengths, and the length of the otolith, as well as the thickness and weight of these bones compared to the body weights of two different species of invasive fish in the Iraqi aquatic environment, the common carp Cyprinus carpio of the Cyprinidae family, and the common Tilapia. Coptodon zillii, from the Cichlidae family. The results showed that the otolith were not related to some of the vital characteristics of the studied fish, and there were differences in the correlation coefficient between some vital measurements with high significant degrees at levels (0.01) and (0.05), when comparing the otolith from the two sides of the head from the right. While the rest is for one individual and between individuals of the two different species.