Clinical and Hematological Effects of Glyphosate Herbicide on Clarias gariepinus Juvenilles

摘要

Juveniles of Clarias gariepinus were exposed to 0.00mg/l (control) 20mg/l, 40mg/l and 60mg/l of glyphosate solution for 96 hours. Clinical signs were observed and blood was analyzed for hematological parameters such as haemoglobin (Hb), packed cell volume (PCV), white blood cell (WBC), red blood cell (RBC) and its indices: mean corpuscular haemoglobin concentration (MCHC), mean corpuscular haemoglobin (MCH) and mean corpuscular volume (MCV). The results from the study indicated a significant (P<0.05) reduction which is concentration dependent on the value of PCV, Hb, RBC, MCV, MCH and MCHC. The value of WBC increased significantly (P<0.05). These alterations were more pronounced in the fish exposed to 60mg/l of the toxicant. Respiratory stress, erratic swimming, piping and darts were observed in the exposed fish which varied with the concentration of the toxicant. From this study, it can be concluded that glyphosate is toxic to C. gariepinus juveniles; therefore, its use should be controlled so as to prevent its entrance into water bodies to minimize aquatic pollution.