Abstract
This research aims to determine the growth of lettuce and water spinach plants used as biofilter in koi fish (Cyprinus carpio) aquaponic system. Research was carried out at the Laboratory of Fisheries, Ciparanje, Faculty of Fisheries and Marine Sciences, Universitas Padjadjaran from March to April 2018. Research was carried out experimentally using Randomized Block Design (RBD) with 2 treatments and 6 repetitions. The treatments were a combination of koi and water spinach, and a combination of koi and lettuce. The parameters observed were fish growth, fish survival, increase in length of plant stems and increase in leaf strands. The combination of koi fish and water spinach plants produced the highest productivity of plants, with stem length of 39 cm and the addition of 15 leaflets. This combination also produced the highest absolute growth of 3.93 grams / fish and survival rate of 100%.
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