Effect of cassava mill effluents on the osmotic and hematology of clarias gariepinus juveniles

Clarias gariepinus juveniles of mean weight 17.0 ± 0.5g were allotted to aquaria at 10 fish per treatment (1-5) in two replicates based on the concentration of cassava mill effluent to be administered (100, 110, 120, 130 and 140 ml/l) respectively .Treatment 6 serves as the control. The different concentrations were administered to the various treatments and after 96 h, no mortality was recorded in the control (treatment 6),100% mortality was recorded in concentrations 130 and 140 ml /l , 20% and 30% mortality was observed in concentrations 100 and110 ml/l respectively while 60% mortality was recorded in concentration 120 ml/l during the 96 h experiment. Osmotic fragility of Clarias gariepinus revealed that cassava mill effluent has no significant effect on Clarias gariepinus juveniles. Hematological changes observed include; anemia was significantly high, PCV, Hb, MCV values were significantly low in all the experimental treatments relative to the control (P 0.05) than the control. Other observations during the experiment includes reduced activities (swimming), haemorrahagic patches on the ventral surface of the fish , general discoloration and anoxia.