STUDIES ON ACUTE TOXICITY AND MORTALITY RESPONSE OF QTRACRON (PROFENOTO) AND KARATE (LAMBDA CYHALOTHRIN) OF OREOCHROMIS MOSSAMBICUSC. Radhakrishnan NairAbstract Static bioassay experiments conducted under laboratory conditions on Orcochromis mossambicus using organophosphate pesticide, curacron (Profenofos) and pyrethroid, karate (Lambda cyhalothrin) revealed the toxicity. The percentage mortality and the LCso values for 24, 48, 72, 96 and 120 hours were determined. The LCso values of curacron and karate to 0. mossambicus were 3.461, 2.516, 2.211, 1.947, 1.679, 1.491ppm and 1.148, 0.667, 0.631, 0.574, 0.551 and 0.490 respectively. The results indicated that the mortality for any fixed period increased with the increase of exposure period. LC3 values decreased with increased exposure period
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