Fisheries contribute greatly to thewell-being of many millions of people. The sector generatesemployment and economic values that are important toindividuals, communities and national economies. However,the world's fishery resources are not infinite, andappropriate conservation must be employed for ensuringsustainable livelihood through fisheries in the future aswell. The Big Numbers Project, a collaborative effort by theFood and Agriculture Organization (FAO), WorldFish Centerand World Bank, addresses the lack of accurate andaccessible disaggregated information on small andlarge-scale fisheries, in inland and marine waters,currently experienced in the international fisheries arena.This is a preliminary report of the project, giving asummary of the results of case studies carried out in aselected number of countries and providing a first analysisof the differences between marine and inland small andlarge-scale fisheries in developing countries.