Tambunan, Erni ParulianTang,Usman M.Mulyadi2013-07-242013-07-242013-07-24sumarnihttp://repository.unri.ac.id:80/handle/123456789/4686This research was conducted from March to April 2013, for 45 days in Breeding Laboratory Unit of Fisheries Faculty and Marine Sciences, University of Riau. The aim of the research was to investigate the effect of EM4 inoculant and utilizing mustard plant as biofilter, on growth and survival rate of river catfish (Mystus nemurus). The Method used was experiment with 4 treatments and 3 replication. The treatments were A = Water without the inoculant EM4 (as control), B = 250 ml inoculant EM4, C = 300 ml inoculant EM4, D = 350 ml inoculant EM4. The best result was treatment C (300 ml inoculant EM4) with absolute growth weights (11,83 g), absolute growth length (6.01 cm), daily growth rate (2.77%) and survival rate 93,06%. Water quality during in the research with ammonia (NH3) 0,02-0,09 mg/l, nitrit (NO2) 0,73-4,10 mg/l, nitrat (NO3) 0,63-2,73 mg/l, temperature 30-310 C, pH 6-7, dissolved oxygen (DO) 3-4,5 mg/l.otherRiver catfish (Mystus nemurusaquaponicinoculant EM4student Paper Post Degree