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This study investigated the effects of temperature, salinity, and algal diet to find the optimal conditions for 5 days for the mass culture of the tropical tintinnid, Metacylis tropica. This tintinnid had a small, hyaline, and ovoid lorica. The oral diameter, length, and maximum width of the lorica were 36.7 μm, 49.5 μm, and 44.5 μm, respectively. In the temperature experiments, the highest maximum density and population growth rate were observed at 30°C with 340.7 cells/mL and 1.1/day, respectively. Lower salinities adversely affected the population growth of M. tropica. The maximum density was observed at 33 ppt (840 cells/mL). In the diet experiments, M. tropica fed Isochrysis galbana showed the highest density (413 cells/mL) and population growth rate (1.2/day). As a result, M. tropica is appropriate as a potential prey organism for early fish larvae with smaller mouths because the tintinnid has a relatively small size compared to the rotifer. In addition, the conditions of 30°C, 33 ppt and supplying I. galbana would be effective in the cultivation of M. tropica.

Population growth of a tropical tintinnid, Metacylis tropica on different temperature, salinity and diet