This article investigates the impact of Marine Stewardship Council (MSC) certification on a Japanese certified fishery. In September 2008, the MSC first certified the Kyoto Danish Seine Fishery Federation (KDSFF) as a sustainable fishery in Asia. In order to examine any impact of MSC certification on the KDSFF, this study examines structural changes in the market. Since no immediate impact of price premium changes can be realized, structural break tests and cointegration tests are conducted. The monthly ex-vessel price of flathead flounder in the Kyoto market is compared with those in the two adjacent uncertified markets. The structural break tests detected a significant impact two months after the KDSFF's certification. The cointegration and Granger causality tests showed that the Kyoto market was previously influenced by other larger markets, but has become less subject to their influence after introduction of MSC certification.

JEL Codes: C32, Q13, Q18, Q22.