International certification schemes in aquaculture, such as the Aquaculture Stewardship Council (ASC), have emerged over the past decade. This study was conducted at Toan Thang Cooperative (TTC), Vietnam, to clarify its operation and performance in the ASC scheme. In 2017, TTC obtained VietGAP as a premise for the ASC in 2018. The entire certified process cost US$69,839. Additionally, the auditing process was supported by multiple levels of organisations and private seafood enterprises, whereas the cost for auditing, maintaining, and training was paid by supporters. As a result, farmers with ASC-certified shrimp products can get premium prices and further financial benefits. Because the ASC has improved financial efficiency for farmers, it should be replicated in small-scale shrimp farming