The fisheries sector is vital for global food security but faces increasing sustainability challenges. A well-developed B2B (business-to-business) market, linking producers, processors and distributors, can add value and stimulate innovation across the supply chain. Theoretical foundations and methodological approaches to the formation of a B2B market in fisheries, together with the role of such a market in promoting sustainable development, are examined with reference to both global and Uzbek experience. UN/FAO data and industry studies are integrated to analyse trends, constraints and best practices. Key findings indicate that the adoption of advanced processing, certification schemes and digital solutions within B2B channels improves efficiency and reduces waste. Policy support for B2B platforms, targeted technical training and incentives for sustainable practices are recommended.