This study aims at understanding the concept of "tellutemmaserang" and "duatemmalesseng" as a cultural value system embodied in the ethos and worldview of Bugis Fishermen in Toronipa Village KonaweRegency, the function and effect of the ethos and way of life in going through the socio-economic life as well as a shift or change of the ethos and worldview principles in relation to the dynamics of social and cultural changes occurring hitherto. The data in this study were obtained through field observations and in-depth interviews and analyzed in a qualitative descriptive way. This study lead to some main conclusions. First, in an attempt to leadto a variety of social life, the Buginese fishermenin this area base their life on the ethos and social philosophy which are called "tellutemmaserang" and "duatemmalesseng". Second, in the ethos and worldview,the fishermen realize that nature is an integral part of human beings, so that the structure of natureis reflected in the social structure, social stratification and economic structure. Third, with the ethos and worldview, to meet the socio-economic needs, the Buginese fishermen keep up high morale with untiring perseverance. Fourth, the principles that shape attitudes and behavior within the framework ofintegrated and interdependent social relations seem toundergo considerable changes occurring at the same time as the process of social development and cultural changes going through in modern life. Fifth, the economic and social behavior of Buginese fishermen in the past, i.e.mutual cooperation, has now changed into individualism.