Haematological investigation on freshwater teleost Labeo rohita (Ham.) following aquatic toxicities of Cr (III) and Cr (VI)

Abstract

The effect of Cr(III) and Cr(VI) toxicity were studied on the haematology of freshwater teleost Labeo rohita exposed for24h, 48h and 96h LC50. Haematological parameters viz,. RBC, WBC, Haemoglobin (Hb), Haematocrit, Mean Cell Volume (MCV) Mean cell Haemoglobin (MCH), and mean corpuscular hemoglobin concentration (MCHC) were studied. Changes in haematological parameters such as total leucocytes and erythrocyte counts, haemoglobin and haematocrit were apparent in the fish exposed to both trivalent and hexavalent chromium. The response of fish to chromium in general was dose dependent in both the Cr3+ and Cr6+ exposed fish. MCH and MCHC values were significantly affected. The study with a specified concentration of Cr3+ and Cr6+ has made it clear that there is differential toxicity based on the valence states of chromium; the hexavalent form is found to be more toxic. The results and discussion in details.