The competitive, dynamic and changing environment in which companies operate today, pose new challenges that allow them to grow and maintain themselves over time, aspects such as customer satisfaction, innovation, and social responsibility are increasingly used objectives by the companies. However, elements such as quality and productivity continue to be critical factors in business sustainability. For this, companies must use methodologies and tools to diagnose their processes, identify their critical points and invest in strategies that optimize the operations of their value chain, the use of their resources, and the quality of their products, in order to overcome always the expectations of the clients and achieve differentiation in the market. The goal of this work is to diagnosis of the situation of the production process in the value chain of the processing and marketing of fish and Shellfish Company as a case study. Also aims to, the identification of waste or MUDA, that affect the quality and productivity of the products. Improvement proposals under Lean Manufacturing tools, for increase the performance in the value chain under study were made. As main results, we can highlight improvement proposals through the lean tools, which promote advances in the organization of the plant and process times.