Patrick da Silva Sousa, Francisco Simão Neto, Paulo Gonçalves de Sousa, Francisco Izaias da Silva Aires, Calebe da Rocha Silva, Kaiany Moreira dos Santos, Viviane de Castro Bizerra, Maria Alexsandra Sousa Rios, José Cleiton Sousa dos Santos
Abstract Fishing waste and its by‐products, whether naturally occurring or generated by the processing industry, represent a significant opportunity for producing high‐value products. These often discarded or underutilized residues can be converted into various valuable products through advanced processing technologies. Among the potential products are fertilizers, biomaterials, cosmetics, biolubricants, and biodiesel. Biodiesel production from residual fish oil, a renewable energy source, is of particular interest. This adds economic value to fishing waste and reduces reliance on fossil fuels, contributing to global sustainability efforts. This study focuses on the promising technologies and trends reported in the scientific literature regarding using residual fish oil for biodiesel production. Industries can promote circular economy principles and more sustainable practices by transforming fishing waste into valuable resources. This research aligns with several United Nations Sustainable Development Goals, including Goal 7 (Affordable and Clean Energy), Goal 12 (Responsible Consumption and Production), Goal 13 (Climate Action), Goal 14 (Life Below Water), and Goal 15 (Life on Land), by advancing renewable energy, promoting waste reutilization, reducing emissions, supporting sustainable marine resource management, and alleviating pressure on agricultural land.