Journal of Environmental Biology

Toxicity studies of butachlor to the freshwater fish Channa punctata (Bloch)

K.S. Tilak*, K. Veeraiah, P. Bhaskara Thathaji and M.S. Butchiram

Department of Zoology, Acharya Nagarjuna University, Nagarjunanagar-522 510, India

(Received: May 17, 2005 ; Revised received: December 18, 2005 ; Accepted: January 14, 2006)

Abstract: The toxicity studies were conducted on the fish Channa punctata (Bloch) by employing static and continuous flow through systems, for the toxicant butachlor (technical grade⁺) and its commercial formulation⁺ (machete 50% EC). The LC₅₀ values are 297.89 ppb and 247.46 ppb for 24 hr  and 48 hr in static for technical and 636.45 and 546.09 for machete. In continuous flow through the values are 270.05, 233.52 to the technical and 567.85 and 481.49 respectively for machete. The tissues show qualitative accumulation and were quantitatively analysed by gas liquid chromatography (GLC).

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