Abstract: An investigation was made in April and July 2005 on the abundance and biomass of Littoraia melanostoma (Littorinidae) and Nerita lineata (Neritadae) in the rehabilitated mangrove forests with different mangrove species and stand ages at the Jiulongjiang Estuary of Fujian Province. The results showed that Nerita lineata was more abundant in mature stands, and had greater biomass and density in Kandelia candelstand than in Aegiceras corniculatum stand. A. corniculatum stand had greater density and biomass of L. melanostoma than K. candel stand, when the two stands had similar ages. In A. corniculatum stands, the biomass of L. melanostoma increased with the age of younger stands; while in K. candel stands, it decreased with the development of the forests. Different habitation patterns of the two snails in different mangrove stands indicated that N. lineate had a strong inhabitation preference for mature K. candel forest, while L. melanostoma was apt to inhabit in younger A. corniculatum forests.

Key words: Benzo(a)pyrene, Boleophthalmus pectinirostris, Antioxidant enzymes, SOD, GPx, CAT