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Seasonal surveys were conducted from April 2005 to January 2006 to compare the distribution of Littoraia melanostoma,a dominant snail species,in rehabilitated Kandelia candel and Aegiceras corniculatum mangroves with different age (4-year,7-year and mature) in Jiulongjiang Estuary,China.Density of L.melanostoma ranged from 8.3 to 54 ind m?2 in these mangrove,with its biomass ranging from 3.13 to 23.00 g m?2.Repeat measure two-way ANOVAs results showed that L.melanostoma density was higher in A.corniculatum than K.candel forest,and the descending order among mangrove ages was 7-year > 4-year > mature forest.