Abstract
Many pesticides are used by agriculturist and monocrotophos (MCP) is one such pesticide used indiscriminately in India to control insect pests. MCP enters surface water and contaminates it. Paramecia have been used in the past for rapid toxicity assessment. Paramecia exposed to 1 to 100 ppm concentrations of MCP exhibit decline in population density, reduction of: overall body length, length and breadth of cytopharynx, rate of feeding and cyclosis. Technical grade MCP is toxic toParamecium caudatum even at sub lethal concentrations. Key words: Paramecium caudatum, monocrotophos, cytopharynx, feeding rate, cyclosis, pesticide.
Highlights
Water quality is essential for sustaining health of aquatic organisms and presence of toxicants in water poses threat to the organisms inhabiting such water bodies
Many pesticides are used by agriculturists and monocrotophos (MCP) is one such organophosphate pesticide used indiscriminately in India to control insect pests
Paramecia have been used in the past for rapid toxicity assessment of pesticides (Komala, 1992; Juchelka and Snell, 1995; Rouabhi et al, 2006; Rao et al, 2007)
Summary
Water quality is essential for sustaining health of aquatic organisms and presence of toxicants in water poses threat to the organisms inhabiting such water bodies. The present study reports the effect of monocrotophos on the population density, body length, cytopharynx, feeding rate and cyclosis of Paramecium caudatum which is considered as an excellent cellular model for toxicity test (Rouabhi et al, 2006). Each beaker contained 100 ml test concentration prepared in Sonneborn’s medium and 103 paramecia.
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