بعض النواحي البايولوجية لسمكة البلطي الأزرق (Oreochromis aureus)‎ في المبزل الشرقي قضاء بلد العراق

الملخص EN

The fish samples collected by electric fishing from march till December 2018 from the Eastern drain / Salahuddin, 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 (Isometric) with value of regression (b) 3.073, A negative relationship (2.976, 2.888, 3.304 and 2.713 for spring, summer, anthem and winter respectively.

The condition factors were (2.15, 1.96, 2.00 and 1.907 for all seasons respectively.

The linear relationship between total length and other body dimensions were high correlation except heist of ventral 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.