What specifically are you looking for? A long-term database with macrobenthic infaunal densities and biomass? If so, a good long-term data base from a temperate estuary is generated by the Chesapeake Bay Program in the US. There are fixed point and random locations. The data can be found at:
http://data.chesapeakebay.net/Home
There are nearly 30 years of fixed point data and almost 20 of random data available.
I don't know what the objectives of your study are but this data set might help you.
There are also data bases for separate marine areas, e.g. the North Sea or the Mediterranean Sea. Are you interested in those, or more specifically about your own area (Philippines)?