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ABSTRACT
A small-scale modular system was developed using stepwise up scaling of rotifer cultures from Ehrlenmeyer flasks holding 2-litre culture volumes to 180 litre cultures in cylindrical tanks equipped with an outlet from a conical bottom. Rotifers of an asexually reproducing clone, isolated in our laboratory, were cultured in tanks with sieved, aerated, natural sea water and fed on bakers' yeast at a temperature of 25–27° C. Cultures attained rotifer densities ranging from 200 to 500 rotifers per ml (rot. M1−1), resulting in an average production of 70 rot. M1−1 day−1. This system allows for versatile planning of operating units in accordance with the demands of the hatchery.