This study aimed to identify and prioritize risks within the tuna supply chain on the South Coast of East Java, focusing on factors that impact the overall efficiency, sustainability, and economic viability of the industry. The research employs the PROMETHEE method, a multi-criteria decision-making tool, to systematically evaluate and rank risks associated with tuna production, particularly those related to product quality, work safety, and logistical efficiency. The findings reveal that product quality is the most significant risk, primarily driven by the perishability of tuna and inadequacies in cold chain infrastructure. This poses a substantial challenge to maintaining quality from catch to market, threatening the competitiveness of East Java's tuna industry in both local and global markets. The study also emphasized the importance of stakeholder collaboration in managing these risks. By engaging fishermen, middlemen, traders, and other key players in the supply chain, the research provides a comprehensive analysis that captures the diverse challenges faced by different groups. Prioritizing risks enables stakeholders to focus their efforts on the most critical areas, ensuring a more resilient and sustainable supply chain. This research offers valuable insights into risk management within the tuna supply chain in East Java, with practical implications for improving industry practices. By addressing the identified risks—particularly through enhanced cold chain management and stakeholder cooperation—the study provides actionable strategies for strengthening the region's tuna industry. These findings align with broader goals of the blue economy, promoting sustainable practices that support economic development while preserving marine resources.