The rising global demand for canned tuna has expanded its production, making it a key sector in seafood processing. However, this industrial process generates considerable organic and inorganic waste, requiring effective management to reduce environmental impacts and enhance resource efficiency. Despite its significance, data on waste quantities from tuna canning remain scarce. This study analyzed the production process of an Azorean canning company, identifying waste sources and characterizing organic residues. Key waste streams included solid organic matter (fish remains), wastewater from cleaning and cooking, and non-organic materials like packaging scraps. A material flow analysis assessed waste movement and management strategies. Chemical characterization revealed high protein, lipid, and mineral content in solid organic waste, highlighting potential for valorization in industries like animal feed, bioenergy, and fertilizer production.