The histological and physiological alterations in gills and erythrocytes of cyprinus carpio and liza abu as biomarker to freshwater pollution

الملخص EN

As a component of a large research programme to evaluate the effects.

of contaminants on fish health in the fields , histopathological studies have been conducted to help establish meat of causal relationships between contaminants exposure and various biological responses and use of those responses as biomarker to aquatic pollution .

Two fish species C.

carpio and L.

abu were sampled from four sites near of industrialize and human pollution areas from _ Shatt Al-Arab River ,while the fifth place was considered as control because it's far located from direct pollution sources .

Some of histological and physiological alterations were examined in both gills and blood .

The alterations were significantly higher in fish collected from two places ( 1 & 2 ) compare with other sites , histological was represented by hyperplasia , hypertrophy , bleeding , inflammations , edema , necrosis , epithelial separation and clubbing shaped , while , physiological was represented‘ by decrease of Na+ , K+ , Ca” concentrations , Chloride cells number and increase of respiratory diffusion distance , in addition to , increase of micronuclear of red blood cells .

all fish in fifth place didn't showed any histological and physiological responses and retained their rates of the normal level compares with other places