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Effect of sublethal doses of three organophosphorus insecticides on the haematology of Channa punctatus (Bloch)
Lone, K.P.; Javaid, M.Y. (1976). Effect of sublethal doses of three organophosphorus insecticides on the haematology of Channa punctatus (Bloch). Pak. J. Zool. 8(1): 77-84
In: Pakistan journal of zoology. Panjab University: Lahore. ISSN 0030-9923, more
Peer reviewed article  

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Keyword
    Fresh water

Authors  Top 
  • Lone, K.P.
  • Javaid, M.Y.

Abstract
    The effects of sublethal doses of 3 insecticides on the haematology of the freshwater fish Channa punctatus are described from investigations in the laboratory in Pakistan. All treatments caused a progressive decrease in the erythrocyte count and haemoglobin concentration, and increase in the mean corpuscular haemoglobin, colour index and erythrocyte diameter. Malathion and methyl-parathion increased the nuclear diameter of the erythrocytes after treatment for 24 h, but treatment with these insecticides for 96 h decreased the nuclear diameter. Fenthion (Lebaycid) decreased the nuclear diameter. The ratio of cell size:nuclear size increased in all groups of treated fish. The total leucocyte count fluctuated and exhibited no definable pattern for treatment with malathion and methyl-parathion, but fenthion caused a decrease in the leucocytes. Treatment with all insecticides introduced a new type of leucocyte, which was more like a neutrophil than a lymphocyte or monocyte, and caused a decrease in the percentage of the latter types. Malathion and methyl-parathion reduced the clotting time, but fenthion increased it.

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