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This research aims to discover the ability of barb (Osteochilus hasselti) as a water purifier biological agent in Cirata Reservoir by find the Average daily Gains of the fish, Efficiency and Cost Reduction in production. The experiment ranges from September to November 2014 at Cirata Reservoir’s Floating Net Cage, starting by acknowledging the genus and the number of periphyton from week 1 to week 6. To analyze Average Daily Gain, a Complete Randomized Design is used by applying five treatments, namely Treatment A: not fed (control), Treatment B: feeding level 1% of the fish’s weight, Treatment C: feeding level 2%, Treatment D: feeding level 3%, and Treatment E: feeding level 4%. The data are then collected in Variant Analysis; if a significant difference is found, it is proceeded to F Duncan Test. The economic parameter are Efficiency and Cost Reduction in production. The results show that there are 20 kinds of periphyton from phytoplankton genus. The number of periphyton is not different among the treatments, the ADG is not significantly different for every treatment. We found that increased efficiency in the treatment of A (not feed) and decreased production costs as 25 %.

Monosex Barb (Osteochilus Hasselti ) Culture with Reduction Feed on Economic Efficiency and Cost Reduction at Net Cage in Cirata Reservoir