PENGARUH APLIKASI SISTEM BIOFLOK SERTA SUPLEMENTASI PAKAN SINBIOTIK TERHADAP PERFORMA PERTUMBUHAN DAN PROFIL KOMUNITAS MIKROBA IKAN NILA (OREOCHROMIS NILOTICUS)

• Main Author: Joey Maynardo Murtala, Juan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/55041
• Institution: Institut Teknologi Bandung

Tilapia (Oreochromis niloticus L.) is one of the freshwater fish commodities with the highest production level in Indonesia. Tilapia aquaculture in Indonesia is still dominated by conventional open systems (flow-through) with low production stability and a higher risk of causing diseases due to the lack of water quality control during the cultivation period. The closed aquaculture system using biofloc technology is an alternative cultivation strategy to improve cultivation performance with high disease control. In addition, the application of functional feed with synbiotic supplementation, which is a mixture of probiotics and prebiotics, is now also an alternative disease control strategy in tilapia aquaculture. In this study, the growth performance and profile of the culture water and fish gut microbial communities in the biofloc system were compared, using both commercial feed ('B') and synbiotic feed ('BS') of 6 g/kg, compared to controls using the semi-batch system ('K'). The tested synbiotics contained a probiotic consortium of 108 CFU/kg of feed and 0.5 % Spirulina platensis microalgae. Water quality measurements (dissolved oxygen, temperature, pH, ammonium, nitrite, and nitrate levels) and growth measurements (fish mass and length) were carried out every week for 70 days of the rearing period. Microbiological parameters of water and tilapia intestinal samples were carried out using the total plate count method on culture day 0, 21, 42, and 70. The results showed that BS had an average daily growth value (0.94 ± 0.30 g/day), specific growth rate (5.91 ± 0.49 %/day), feed conversion ratio (1.66 ± 0.52), survival rate (91.67 ± 7.26 %), total biomass (1.68 ± 0.27 kg), and productivity (16.76 ± 2.73 kg/m3) that were better than B or K. Total heterotrophic bacteria in BS water sample (104-105 CFU/mL) was more stable than B or K; with the total Vibrio in the intestinal sample (104 CFU/g) which was also lower than B or K. Overall, this study shows that the application of the biofloc system together with synbiotic feed supplementation can increase the growth of tilapia with more optimal microbiological parameters, so that it has the potential to be applied in intensive tilapia rearing on industrial scale.