The aim of this study was to assess the effect of Mercuric chloride on the growth and haematological parameters in the freshwater catfish, Clarias gariepinus. A total of 30 fishes were used for each concentration as well as in the control. Clarias gariepinus was exposed to 0.02, 0.04, 0.06, 0.08 and 0.10 mg/l of HgCl 2 for 56 days. The treatment with mercuric chloride was found to inflict a drastic reduction in the total count of RBC's. The reduction was time dependent; as concentration of mercuric chloride increased, the RBC levels declined. Exposed fishes showed a significant decrease in WBC count when compared to the control. The morphological indices MCV, MCH and MCHC fluctuate as the test concentration increased. The chronic exposure to sublethal Isiyaku et al.; JEAI, 33(6): 1-7, 2019; Article no.JEAI.27104 2 concentration of mercuric chloride to the studied fish showed a significant decrease in final body weight in comparison to control group. Also, Growth parameters such as specific growth rate (SGR), food conversion efficiency (FCE), protein efficiency ratio (PER), food conversion rate (FCR) decreased with increased concentration of mercuric chloride. The mercuric chloride caused a significant decrease in the survival rate (P < 0.05). Original Research ArticleMeans on the same row with different superscript are statistically different (p<0.05). Keys: Control = 0.00 , Trt 1 = 0.02mg/l, Trt 2 = 0.04mg/l, Trt 3 = 0.06mg/l, Trt 4 = 0.08mg/l, Trt 5 = 0.10mg/l MIW=Mean initial weight, MFW=Mean final weight, MWG=Mean weight gain, SGR=Specific growth rate, FCR=Food conversion rate, FCE=Food conversion efficiency, PER= Protein Efficiency Ratio Peer-review history: The peer review history for this paper can be accessed here:
Changes in Oreochromis niloticus blood cells were investigated after 96-h of exposure to cadmium chloride. One hundred and eighty (180) Oreochromis niloticus with average weight of 26.07±1.23g and mean length of 17.50 + 0.50cm were divided into 5 groups (T1-T5) at ten (10) fish per group and in triplicates after being acclimatized for 14 days. They were then exposed to various concentrations (0, 28, 30, 32, 34 and 36 mg/l) of cadmium chloride. The packed cell volume (PCV) of the treatments decreased significantly relative to that of the control, while their platelet counts increased compared with the control. There was also a reduction in the RBC (2.70, 2.51, 2.24, 1.98, 1.64 and 1.22) of treatments. Other blood parameters did not vary significantly in comparison with the control group, but it is worth noting that, the mean corpuscular volume (MCV) (70.78, 76.09, 83.71, 90.55, 105.49 and 128.68fL), mean corpuscular haemoglobin (MCH) (24.66, 24.49, 27.37, 29.83, 33.14 and 42.18pg) and mean corpuscular haemoglobinconcentration (MCHC) (34.83, 32.19, 32.71, 32.95, 34.41 and 34.78%) increased considerably in all treatments compared to the control. These alterations have been attributed to direct or feedback responses of structural damage to RBC membranes resulting in haemolysis and impairment inhaemoglobin synthesis, stress related release of RBCs from the spleen and hypoxia, which was induced by exposure to cadmium chloride. This study therefore gives an insight into toxic effect of cadmium chloride on fish.
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