ACUTE TOXICITY OF CYPERMETHRIN TO FRESHWATER FISH LABEO ROHITA AND MYSTUS VITTATUS: A COMPARATIVE EVALUATION BETWEEN TECHNICAL AND COMMERCIAL FORMULATIONRAJIB MAJUMDER, SUCHISMITA CHATTERJEE (SAHA) AND ANILAVA KAVIRAJAbstract Static bioassays were carried out in laboratory to evaluate variation in acute toxicity between technical grade (92% a.i) and commercial formulation (10 % EC) of cypermethrin to two freshwater fish Labeo rohita and Mystus vittatus. Recovery of actual concentrations of cypermethrin in water after 2h of exposure of the nominal concentrations ranged between 86.1% in technical grade (T) to 92.2 % in commercial formulation (F) of cypermethrin. Based on 96h LC50 values of T and F cypermethrin respectively, both L. rohita (3.08 and 2.09 μg/L, 2h actual conc.) and M. vittatus (3.84 and 2.90 μg/L, 2h actual conc.) were found to be susceptible to cypermethrin. Toxicity of T. cypermethrin in water existed up to 48h while toxicity of F cypermethrin existed till 96h. From pairwise comparison of LC50 values between T and F it was concluded that F was more toxic than T. cypermethrin. Moreover, F cypermethrin remained viable in freshwater aquatic ecosystem for longer period.
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