The higher abundance of Gastropods was obtained in study site
4 (169 ind/m2) which was dominated by Potamididae (151 ind/
m2). These results are in agreement with Dharma (1988) who
reported that mangrove forest is the most preferred habitat for
families Potamididae. Moreover, Budiman (1988) explained
that Potamididae had a wide geographical distribution and also
found in high abundance in mangrove ecosystem. In addition,
the higher abundance of Bivalves was found in study site 3 with
density of 14 ind/m2 dominated by Isognomonidae (8 ind/m2).
Overall, Ostreidae had high abundance in present study (13 ind/
m2). According to Plaziat (1984), Isognomonidae and Ostreidae
are abundant in mangrove area because they have higher adaptation
ability in changing environmental factors such as drought
due to low tide and salinity.