Rubber seed oil has a high potency to be used as a new lipid source within red tilapia diet. However, the rubber seed oil contains antinutritional factor such as hydrogen cyanide (HCN). HCN is classified into heat-labile; therefore, heating effectively reduces the HCN content. Based on this fact, this research evaluated the use of rubber seed oil with and without heating as lipid source in red tilapia diet. Four isonitrogenous and isocaloric diets were prepared as experimental diet. Each test diet contains different lipid sources such as crude palm oil + corn oil (CTRL), crude palm oil + rubber seed oil with heating (CPO:PRSO), 100% rubber seed oil with heating (PRSO) and 100% RSO without heating (URSO). In average, there were no significant differences (Tukey: p < .05) among test diet except diet with 100% rubber seed oil without heating. It concluded that 100% rubber seed with heating within test diet has no effect on growth, feed performance, blood profile, cholesterol plasma, body and liver glycogen, malondialdehyde (MDA) and the activity of superoxide dismutase (SOD). K E Y W O R D Slipid source, red tilapia, rubber seed oil | 115 KUSHAYADI et Al.

Penelitian ini bertujuan untuk mengetahui perbedaan media tanam pada akuaponik terhadap pernurunan kadar nitrat dan posfat pada kolam pemeliharaan ikan mas. Penelitian di rancang menggunakan Rancangan Acak Lengkap (RAL). Perlakuan terdiri dari 4 perlakuan dengan 3 ulangan.. Perlakuan terdiri atas satu kontrol (tanpa akuaponik) dan tiga aquaponik yang menggunakan media tanam yang berbeda.Media tanam yang digunakan sebagai bahan uji adalah batu apung, akar pakis, dan serabut kelapa. Batu apung memberikan pengaruh yang signifikan terhadap penurunan nitrat dan pospat. Berdasarkan penelitian ini batu apung menurunkan nnitrat dan pospat sejumlah 65,55 % dan 94,06 %. Penggunaan batu apung memberikan sintasan 69,3 % dengan laju pertumbuhan spesifik sebesar 2,3% per hari.