Document Type : Research Paper
Abstract
The fish samples collected by electric fishing trap from march till December 2018 from the Eastern drain / Salah Al –deen , Iraq. Some biological aspects and seasonal variation of Tilapia (Oreochromis aureus) were studied. The relationship between the total length and weight for all seasons were (semi - Isometric) with value of regression (b) 3.073, A negative relationship (2.976, 2.888 and 3.119 for spring, summer and autumn respectively. The condition factors were (2.15, 1.96 and 2.007 for all seasons respectively. The linear relationship between total length
and other body dimensions were high correlation except height of pectoral fin and the distance after pelvic fin, Food components investigated, it was found that algae represent more than half of the contents in the gut for blue tilapia by points method 51.46 % and 92.31 % in frequency of occurrence method.
Main Subjects