Abstract: The tannery industries and drainage from urban and agricultural areas add chromium as one of the heavy metals to the aquatic environment and thereby imposing negative effects on the aquatic fauna. In the present study, the haematological alterations produced on short-term exposure to sublethal concentration of chromium (25 mg L-1) were investigated in fresh water air-breathing fish, Channa punctatus (Bloch) for 24h, 48h and 72h respectively. The 96h LC50 of chromium salt, potassium dichromate was determined to be 34.59 mg/L. The results revealed statistically significant decrease in erythrocytic parameters like TEC (Total Erythrocytic Count), Hb (Haemoglobin) content and Haematocrit (Hct %) values in all experimental groups compared to the control with an increase of exposure periods. On the contrary, leucocytic parameters such as TLC (Total Leucocytic Count), Leucocrit (Lct %) and neutrophil populations were significantly increased during acute exposure. Acute lymphocytopenia was also recorded. The absolute corpuscular values like MCH (Mean Cell Haemoglobin) and MCHC (Mean Cell Haemoglobin Concentration) also exhibited significant increase in fishes of experimental groups while MCV (Mean Cell Volume) exhibited a fluctuating pattern. The depression of erythrocytic parameters clearly indicated that the fishes became anaemic due to acute toxicity of chromium.
Keywords: Channa punctatus, hexavalent chromium, erythrocytic parameters, leucocytic parameters, neutrophilia, lymphocytopenia.
Title: Acute Toxicity of Hexavalent Chromium in Adult Channa punctatus (Bloch, 1793) with regard to changes in Erythrocytic and Leucocytic Profiles
Author: Samudra Gupta, Rajarshi Ghosh
International Journal of Life Sciences Research
ISSN 2348-313X (Print), ISSN 2348-3148 (online)
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