Tanjung, Afrizal2016-03-222016-03-222016-03-22978-979-792-437-9wahyu sari yenihttp://repository.unri.ac.id/xmlui/handle/123456789/8106Intensive observation on gastropods, every Mart from the year of 2008 to the year of 2012, was carried out to document some indicators of gastropods extinction. The purposive sampling technik was used in this work. The psycochemical parameters of its habitat were also monitored every sampling done. It was found that the intertidal zone substrate consists of sand, while the habitat parameters were more than 5,6 mgl-1 disolved oxygen, pH arround 7,0–7,2 salinity 30,2 -32,2 ppt, temperature 28,6-29,60C, the visibility 100%. The number of species, the number of found gastropods, the abundance, the maximum shell size of found gastropods showed decreasing from year to year; while routine collecting by the visitor and marine organisms shell collector, and disturbance by the fisherman activities were occured. This indication showed a tendency of gastropods extinction.endecreasingdisturbanceextinctiongastropodsintertidalUR-Proceedings