EFFECT OF ORGANOPHOSPHORUS PESTICIDE ON THE REPRODUCTIVE BIONOMICS OF ROTIFER BRACHIONUS PLICATIHS (O.F. MULLER)

摘要

The effect of Organophosphorus pesticide, methylparathion on the reproductive bionomics of the rotifer Brachionus plicatilis was assessed. Sub-lethal concentration of pesticide 24 h LC_(50) bioassay was performed under six different concentrations (0.1, 0.3, 0.4, 0.5, 0.6 and 0.7 mg/L). LC_(50) value of B. plicatilis were 0.5 mg/L. Based on the LC_(50) value, newly hatched neonates were individually cultured in three varying concentrations (0.1, 0.3 and 0.4 mg/L) of methyl parathion. The life historyparameters such as time (h) the rotifer bear release of neonates and life span were evaluated. Population growth study depicted that the population growth of B. plicatilis decreased with increasing concentration of methylparathion.