<![CDATA[Onggok adalah hasil produk samping pengolahan ubi kayu menjadi tapioka yang berpotensi dikembangkan sebagai bahan baku pakan ikan. Permasalahan yang dihadapi yaitu kecernaan onggok masih relatif rendah sehingga perlu ditingkatkan melalui teknik fermentasi. Tujuan penelitian ini adalah mengevaluasi kemampuan bakteri B. megaterium SS4b dalam menyederhanakan nutrien kompleks dari onggok, serta menentukan dosis bakteri yang sesuai untuk proses tersebut. Penelitian ini terdiri atas dua tahap yaitu: 1) penentuan aktivitas enzim selulase, amilase, dan protease bakteri B. megaterium SS4b secara semi-kualitatif; 2) penentuan dosis inokulum yang efektif untuk proses fermentasi onggok (0%, 3%, 6%, dan 9%). Parameter yang diukur meliputi glukosa terlarut/gula pereduksi, protein terlarut, protein kasar, serat kasar, dan kecernaan protein secara in vitro. Percobaan dilakukan menggunakan rancangan acak lengkap (RAL) dengan empat perlakuan beda dosis bakteri untuk fermentasi onggok dan tiga ulangan. Hasil penelitian menunjukkan bahwa B. megaterium SS4b memiliki aktivitas selulase, amilase, dan protease, serta mampu menghidrolisis onggok. Dosis penambahan isolat bakteri sebanyak 9% pada kepadatan 1011 sel/mL dan inkubasi selama 72 jam merupakan dosis terbaik dalam meningkatkan kualitas nutrien onggok. Proses fermentasi ini dapat meningkatkan kandungan protein terlarut, kecernaan protein, ketersediaan gula pereduksi, dan penurunan serat onggok berturut-turut adalah sebesar 2,9 kali, tiga kali, satu kali, dan enam kali dibandingkan dengan kontrol.Cassava starch residue is a by-product in tapioca production that has the potential to be used as one of the ingredients in fish feed. The problem was that the digestibility of cassava starch residue was relatively low but could be improved through fermentation. The purpose of this study was to evaluate the ability of B. megaterium SS4b bacteria in simplifying the nutrient complex of cassava starch residue and determine the appropriate bacterial dose for the process. The study consisted of two stages: 1) determining, semi-qualitatively, the activity of cellulase, amylase, and protease enzyme of B. megaterium SS4; 2) determining the effective inoculum dose for the fermentation process of cassava starch residue (0%, 3%, 6%, and 9%). Parameters measured included dissolved glucose/reducing sugar, dissolved protein, crude protein, crude fibre, and protein digestibility in vitro. The experiment was arranged in a completely randomized design (CRD) with four different treatments of bacterial dose for fermentation of cassava starch residue and three replicates. The results showed that B. megaterium SS4b has cellulase, amylase, and protease activities and was able to hydrolyze cassava starch residue. The dosage level of the bacterial isolate at 9% with a density of 1011 cells mL-1 and incubation for 72 hours was the best treatment in improving the nutrient quality of cassava starch residue. This fermentation process could increase soluble protein content, protein digestibility, availability of reducing sugar, and decrease significantly the fiber content of cassava starch residue]]>
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