Stress responses using haematology was investigated in Chrysichthys nigrodigitatus from Asejire Reservoir and R.Ogun, Southwest Nigeria; respectively receiving predominantly wastes from a bottling plant and abattoir. PCV, Hb, RBC, WBC, heterophils and monocytes values were higher in fishes from Asejire Reservoir; platelets, lymphocytes and eosinophils were however higher in fishes from R.Ogun. Erythrocytic indices of MCV (97.85±12.78) and MCH (105.27±19.54) were respectively higher in fishes from Asejire Reservoir and R.Ogun. Eosinophils (54.07) and CF (42.02) recorded highest respective variability. Redistribution of lymphocytes (CV=14.9 and 5.45), heterophils (CV=31.71 and 11.94) and heterophil:lymphocyte ratio ratio suggested responses that were less impaired or fatigued in Ch. nigrodigitatus from Asejire reservoir (CV=89.70) compared with those from R.Ogun (CV=17.58); which were apparently in better condition (CF=1.38±0.58) than fishes from the reservoir (CF=1.08±0.42).
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