This study aims to establish how the developments in market-related infrastructures in the Philippines such as road, telecommunication, transportation and port facilities are related to price formation and dynamics in the tilapia and roundscad markets. It seeks to relate such developments to the cointegration, transmission and leadership in the wholesale and retail prices of tilapia and roundscad in selected regional markets of the country. Specifically, it attempts to establish the occurrence of price cointegration, which allows the measurement of the speed of price adjustment back to equilibrium whenever a shock causes the prices in the market to be unstable. Moreover, the study establishes the existence of a price leader between the wholesale and retail prices and measures the degree of price transmission in the markets for these two fish species. Finally, the study hopes to identify policy directions that could help improve price formation and distribution of benefits among market players.