Abstract. These analyses of the tilapia fingerling industry in the Philippines focus on the economics of production in different hatchery systems and on fingerling marketing channels. The analyses are based on cross-sectional data from government and private hatcheries in late 1982 and from December 1983 to March 1984.

The relative profitabilities of different hatchery systems (land-based and lake-based) are estimated and economies of scale are analysed. Conceptual and methodological issues inherent in analyses based on cross-sectional data are discussed in the context of the extreme difficult standardizing inputs and output from private tilapia hatcheries which are characterized by wide variation in management practices.