Sasi, as a regime of common (pool) resource management, has long been trusted as one of the most efficient traditional practices in maintaining the sustainability of resources in coastal areas. However, the practice of Sasiwas highly influenced by adat, customary laws set by feudal system that have been replaced by the modern state. This research intended toexamine (1) how the practice of Sasi has changed along with the ecological, social, and economic changes that happened within the society, and (2) what was the impact of this change to the mechanism of the distribution of wealth within the localcommunity. Field research was conducted inthe Kaimana District, West Papua Province,from November - December 2015, using qualitative methods and progressive contextualization strategy.The results indicated that the economic changes were the main driving factor of the dynamic of Sasi in Kaimana. The commercialization of Sasi by village elites hasreplaced this tradition of marine conservation and its orientation with the mechanism ofsurplus accummulation. It degraded the social security mechanism, affectedthe income of the community in general,and developed intimate exclusionsof the sub-ordinate groups,includingwomen
