Penggunaan Tepung Onggok Singkong Yang Difermentasi dengan Rhizopus sp. sebagai Bahan Baku Pakan Ikan Nila Merah (Oreochromis niloticus)
Abstract
Onggok singkong merupakan hasil samping pengolahan tepung tapioka dan berpotensi menjadi bahan baku alternatif pakan ikan. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan tepung onggok singkong yang difermentasi sebagai bahan baku pakan ikan terhadap pertumbuhan nila merah (Oreochromis niloticus). Metode percobaan menggunakan rancangan acak lengkap dengan 5 perlakuan berupa penggunaan tepung onggok singkong yang difermentasi Rhizopus sp. dalam berbagai jumlah dan setiap perlakuan diulang 3 kali. Pakan A (tanpa tepung onggol/kontrol), pakan B (tepung onggok fermentasi (TOF) 10%), pakan C (TOF 15%), pakan D (TOF 20%) dan pakan E (tepung onggok tanpa fermentasi 20%). Pakan diujikan pada nila merah dengan bobot 4,0±0,7 gram, yang dipelihara dalam bak beton berukuran 150 x 150 x 50 cm dengan kepadatan 50 ekor/bak. Ikan dipelihara selama 50 hari dengan feeding rate 3% dan diberikan 3 kali setiap hari. Hasil penelitian menunjukkan bahwa pakan C (TOF 15%) memberikan hasil yang terbaik untuk pertumbuhan nila merah. Pertumbuhan mutlak sebesar 13,7±0,4 gram, tingkat kelangsungan hidup mencapai 95,33%. Kualitas air pada tiap perlakuan berada dalam kondisi optimum untuk budidaya ikan.
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