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Research Paper | July 1, 2019

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The most important environmental factors affecting the early sexual maturity of Coptodon zilli in Iraq

Mohammed Enad Ghazwan

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Int. J. Biosci.15(1), 375-383, July 2019

DOI: http://dx.doi.org/10.12692/ijb/15.1.375-383


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In this study, we try to find the most important reasons for the early sexual maturity of tilapia Coptodon Zilli in four different regions of Iraq, and the relationship between these factors, such as some of the biological characteristics of these fish with some biological and biometric characteristics between the four regions. The Red belly tilapia Coptodon Zilli is a species of fish in the cichlid family which possesses a great economic significance in fisheries due to its reproduction easiness and speed together with its high capability of adaptation under different environmental conditions. In view of the fact that the abundance studies of C. zillii , which has been bred in aquaculture. By contrast, due to the scarcity of studies that deal with the natural fish population. The current study is mainly concerned with collecting samples of C. zillii out of Iraqi inland waters (four different governments including Baghdad-Babel-Wassit and Maysan ) with the aim of identifying some of its features and characters in the Iraqi environment and investigating the phenomenon of the early sexual maturity of this species. Results show that there are statistically significant differences at a confidence level of about (P< 0.05) among the four given areas in the whole morphometric measurements. Thus,  Maysan samples surpassed other governments in terms of the overall length, head length, and body weight which amount to (16.59 cm), (12.99) cm, (4.30 cm )and (97.19 gram ) respectively. In Babel, means values of the amount of the sample to (14.87 cm), (11.70 cm), (3.79 cm) and (72.67 gram) respectively. Results also show that there are indices of early sexual maturity in C. zillii even though the inland waters are of bad qualities in some areas whether by means of distinguishing features or anatomic characters of those gonads.


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The most important environmental factors affecting the early sexual maturity of Coptodon zilli in Iraq

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