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¹ University of Calabar, Institute of Oceanography, Calabar, Nigeria Viewed : 4310 - Downloaded : 4945 The monogonont rotifer Asplanchna priodonta, used in aquaculture as food for fish fry, was mass-produced in three 10 m³ outdoor concrete tanks over an average of 37 days each per batch using the algae Chlorella vulgaris, Eudorina elegans, and Scenedesmus quadricauda as food. In all three batches, the growth performance of A. priodonta fed on E. elegans was superior to that fed with either C. vulgaris or S. quadricauda. The intrinsic rates of natural increase and population doublings were better when fed on E. elegans and C. vulgaris. Highly significant (P<0.001) interactions were observed between A. priodonta and the three algae. Keywords : Zooplankton, rotifers, culture, phytoplankton, hatcheries