After four years of implementation, a project of building a sustainable tra fish supply chain has proved effective with a 7-10% decrease in production costs of fish sapling rearing, breeding and processing. Thanks partly to the project, lots of breeding sites have met global standards. After four years of implementation, a project of building a sustainable tra fish supply chain has proved effective with a 7-10% decrease in production costs of fish sapling rearing, breeding and processing. Thanks partly to the project, lots of breeding sites have met global standards.