<![CDATA[The objective of the research was to determine the effect of feeding with different protein contents on the quality of water in fish culture catfish media (M. nemurus CV) in a recirculating aquaponics system. The method used in this study is the experimental method using a completely randomized design (CRD) using 1 factor, 4 levels of treatment and 3 replication, the treatment is: P0 (control), P1 (Giving pellets artificial protein content 30%), P2 (Pellets with protein content 35%) and P3 (pellet-made with a protein content of 40%. The results of this study are growth weight (g) cathfish best there is in treatment P2 (feeding with protein content of 35%) The final results of the absolute weight of 3.92 g, with the best water quality parameters, namely: 27,8-28,6oC temperature, pH 6.74 to 6.79, dissolved oxygen 5.21 to 5.26 mg / L, nitrate 4.33 mg / L, orthopospate 0.83 mg / L and ammonia 0.0055 mg / L. The length of vegetable mustard at the end of the study is of 5.72 cm.Keyword : Mystus nemurus CV, Aquaponics, Water Quality Parameters]]>
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