The blue economy is essential to sustainable development but is often missing from global economic and multisector modeling. This study introduces fisheries and aquaculture as distinct sectors in the Global Change Analysis Model (GCAM), using harmonized data on production, trade, and use across regions. Seafood is explicitly represented in GCAM’s food demand system, allowing us to explore future dietary scenarios, including increased seafood consumption. This work provides a first step toward integrating the blue economy into global models, offering new insights into trade, environmental outcomes, and the growing role of aquatic foods in sustainable food systems