Agricultural Science Digest

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Agricultural Science Digest, volume 41 special issue (april 2021) : 247-251

Toxic Impact of Zinc Salt (ZnSO4) on Some Haematological Parameters in a Freshwater Mud Eel Amphipnous cuchia (Hamilton, 1822)

Mridula Renu Sinha, Sapna Kumari
1Department of Zoology, Magadh Mahila College, Patna University, Patna-800 005, Bihar, India.
Cite article:- Sinha Renu Mridula, Kumari Sapna (2020). Toxic Impact of Zinc Salt (ZnSO4) on Some Haematological Parameters in a Freshwater Mud Eel Amphipnous cuchia (Hamilton, 1822). Agricultural Science Digest. 41(2021): 247-251. doi: 10.18805/ag.D-5156.
Background: Zinc (Zn), a heavy metal present in aquatic environment, has toxic effect on fishes. Present study was to assess toxicity of Zinc salt (ZnSO4) on total erythrocyte count (TEC), haemoglobin (Hb) content (g/dl) and haematocrit value (PCV%) of blood of freshwater mud eel Amphipnous cuchia.
Methods: Live fishes collected from ponds were acclimatized in laboratory. TEC, Hb content and PCV% of blood samples collected after 15, 30, 60 and 90 days, of control fishes and fishes exposed to low (0.5mg/l) and high (1mg/l) concentrations of ZnSO4, were determined by standard methods.
Result: TEC, Hb content and PCV% varied respectively from 2.48 x 106/mm3 to 2.70 x 106/mm3, 12.02 g/dl to 12.30 g/dl and 28.50 % to 33.60 % in fishes in low and from 2.36 x 106/mm3 to 2.60 x 106/mm3, 11.82 g/dl to 12.20 g/dl and 26.20 % to 31.50 % in fishes in high concentration of ZnSO4 solution, showing decreasing trend in all three blood parameters vis-a-vis their control values viz. TEC (2.74 x 106/mm3), Hb content (12.60 g/dl) and PCV% (34.50 %), decrease being more prominent in fishes exposed to high than those to low concentration. The depletion in these blood parameters may be attributed to the haemotoxic characteristics of Zinc (Zn). 
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