The concept of sustainable development comes from the environmental sectors. It covered by sustainable development include the agricultural and fishery sector. The sustainable fishery is a collection of activities that provide long-term production sustainability, maintain the balance of ecosystems through generations, and preserve biological, social, and economic systems. However, irresponsible fishing activities such as illegal fishing greatly disrupt the development of sustainable fishery. Besides that, Indonesia has vast amount of potential agricultural land, specifically 100.7 million hectares consisting of 24.5 million hectares suitable for wetlands (rice fields). Having a tropical climate, it is possible to conduct agricultural activities throughout the year. This study aims at analysing illegal fishing as threat to sustainable fishery development and observing land usage systems in integrated agricultural activities. This research utilizes a legal method with a normative juridical approach. Data was collected through a literature review and analysed qualitatively. The results suggest three elements in implementing sustainable agricultural and fishery development, namely economic, ecological, and social elements. Illegal fishing and sustainable agricultural development both affect the attainment of these elements. As a recommendation, implementing sustainable fisheries and agriculture management system which includes efforts to minimize illegal fishing and increase world food barns are very necessary.