<![CDATA[The goal of mass culture of chydoridae is to find out the density of chydoridae that was cultured with yeast and rice bran. Chydoridae was cultured on 5 aquaria i.e 3 aquaria measuring 100 x 60 x cm (A, B and C) and 2 aquaria measuring 30 x 30 x 30 cm (D and E). Water quality parameters measured were temperature and pH. The result of chydoridae mass culture for 21 days reached the peak on 14th day with the result as follow : for aquarium A with the concentration of yeast and rice bran 0.05 g/500 mL is 31 individue/ml; aquarium B with the concentration of yeast and rice bran 0.03 g/500 mL is 13 individue/ml; aquarium C with the concentration of yeast and rice bran 0.03 g/500 mL is 5 individue/ml; aquarium D with the concentration of yeast and rice bran 0.005 g/500 mL and aquarium E with the concentration of yeast and rice bran 0.003 g/500 mL can not be detected. Counting the density of chydoridae on 21st day gave the result as follow : aquarium A as much as 4 individue/ml; aquarium B as much as 3 individue/ml; aquarium C as much as 2 individu/ml; aquarium D as much as 1 individue/ml and aquarium E as much as 2 individu/ml. During culturing, water quality such as temperature and pH were on the range that was not harmful the chydoridae life.  Keywords: zooplankton, life food, chydoridae, fresh water, mass culture]]>
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