When rainfall was adequate 2 generations could be produced each year with peaks occurring during spring rains and after the fall monsoon floods. With the onset of the drought, a population density of 400–500 snails/m2 was observed to decrease to 5–15 snails/m2. The density of snails was depended on certain levels of salty water with the highest density (69.2snails/man power in 5min) was in salinity of 2.5–5 ppt