Fisheries subsidies have attracted considerable attention worldwide since the 1990s. The World Trade Organization (WTO), among others, started to strengthen its disciplines in fisheries subsidies in 2001. The academic study of fisheries subsidies can play a key role in contributing to policy-making processes such as WTO negotiations by providing more accurate information on the link between subsidies and overfishing. This paper aims to review the existing academic literature and discuss the role of academic studies in the process of designing and implementing policies on fisheries subsidies. Academic studies on fishery subsides can be divided into three branches: descriptive, theoretical, and empirical. Overall, there has been significant progress in empirical studies on fishery subsidies during the last decade. While the number of studies is still limited, they generate insights that are consistent with theoretical predictions. As for potential contributions of academic studies to actual policies and sustainable management, more interaction between academic experts and policy makers is desirable.

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A demand system analysis was conducted to examine the substitute relationships between tuna and skipjack tuna in the Japanese market. Data from the Annual Report on Family Income and Expenditure Survey from 1965 to 2006 were used for the analysis using the almost ideal demand system (AIDS). Results suggest that skipjack tuna can be a strong substitute for tuna, while other fish groups are not a clear substitute. Our analysis of substitute relationships among fish species in a market indicates that this is a factor that should be considered for better fisheries resource management. For instance, even under a situation where one fish species is underexploited, proper attention to its fishery management is necessary if the fish is a strong substitute for another popular fish species in the market.

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