تقييم التأثيرات السمية للطحلب الأخضر المزرق Chroococcu sp.على أوزان و غلاصم أسماك المولي الأسود Poecilia sphenops

Abstract EN

In the present study the blue green algae Chroococcus sp.

was isolated and from different areas of the Euphrates River in the city of Nasiriyah after its purified and in the liquid culture medium ( Chu-10 medium).

The Histopathological effects of algae on Poecilia sphenops were studied after feeding on it and for two periods of (3) days and (14) days.

The weight of fishes was test decreasing the weight in the group 2 and 3 cowperal with group control histological study showed that this algae causes obvious histopathological changes in the gills, which increases its intensity and diversity with the length of the period of eating fish for algae.

This changes represented by detachment of epithelial layer of the secondary gill lamellae and change in the straight shape of the secondary gill lamellae which have different shapes , Hypertrophy in some epithelial cells of the secondary gill lamellae, hyperplasia in secondary gill lamellae , aneurism and congestion of blood capillary of secondary gill lamellae, aggregation of chloride cells and necrosis in epithelial cells of the secondary gill lamellae.