The global fishing industry, while essential for food production and livelihoods, generates significant waste, including fish heads, bones, viscera, scales, and skin, leading to environmental pollution and resource inefficiency. This study explores the bioconversion of fish waste into valuable resources, such as liquid fertilizers, as a sustainable waste management solution aligned with the principles of a circular economy. Bioconversion processes, including fermentation and enzymatic hydrolysis, transform nutrient-rich fish waste into organic fertilizers that enhance soil health and promote sustainable agriculture. Fish liquid fertilizers are rich in essential macronutrients like nitrogen, phosphorus, and potassium, contributing to improved crop growth, resilience, and reduced dependence on synthetic fertilizers. This article emphasizes the economic and environmental benefits of utilizing fish waste in agriculture, highlighting its role in fostering eco-friendly practices and addressing food security challenges. By advocating for the bioconversion of fish waste, this study underscores the potential for creating a more sustainable agricultural framework and a circular economy in the seafood sector.