Abstract
The purpose of this study was to evaluate the growth and survival of red tilapia (Oreochromis sp) which were cultured using biofloc technology with different amounts of molasses as a source of carbon. This study was carried out for 35 days in August-September 2017 at the Laboratory of Aquaculture Technology, Faculty of Fisheries and Marine Science, Universitas Riau, Pekanbaru, Indonesia. The experiment was done using a completely randomized design (CRD) with the following treatments: A: 50 ml/m3 molasses, B: 100 ml/m3 molasses, C: 150 ml/m3 molasses, and D: 200 ml/m3 molasses. The test fish used was red tilapia with a size of 3.57±0.06 cm and a weight of 1.14±0.09 g. Fish were kept in containers with a volume of 100 liters that are filled with brackish water with a salinity of 17 ppt. Feed was given at 3 times per day. Results showed significant effect of each treatment on the absolute weight and specific growth, but did not significantly affect the survival rate of red tilapia. Best growth and utilization of feed in red tilapia culture using biofloc technology was supplementing with add molasses at a dose of 200 ml / m3 (D).
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