Population Density,Trematodal Infection and Ecology of Lymnaea Snails in Shadegan, Iran

Two snail species belonging to genus lymnaea, l.auricularia and l.gedrosiana, were collected from 6 different districts of shadegan area of khoozestan. eight percent of the total collections of the snails revealed the occurrence of larva in them. the prevalence of larva within the snails varied in different districts may be due to different geoclimatic conditions and availability of fresh water. seasonal prevalence of snails and factors affecting snail populations including water temperature, light, water depth and ph under field conditions were also studied.