PJB-2023-306
The use of fermented sargassum flour with Bacillus aerius bacteria as growing feed for rabbitfish Siganus guttatus
Kamaruddin
Abstract
Sargassum is a staple food for rabbitfish (Siganus guttatus) in nature. Even though its nutritional quality is relatively low, it can be used as a growing feed ingredient after fermentation. This study investigates the potential use of fermented sargassum flour as a growing feed material for rabbitfish from the lowest feeding dose of 7.5% to the highest of 30%. A complete randomized design (CRD) with 15 units of floating net cages was observed during 120 days of the experiment. During the study, fish were fed to satiation three times daily in the morning at 08.00, noon at 11.00, and evening at 16.00. Sampling was done every 30 days to see the treatment effect on the tested fish’s biological response. Results showed no significant differences (P>0.05) in parameters observed, e.g., weight gain, specific growth rate, and daily feed consumption rate. However, those parameters had an increasing trend with increasing doses of 30% sargassum flour. A similar increasing trend was also observed in total feed digestibility, protein digestibility, and feed energy digestibility, although there was no statistical difference (P>0.05). This study concluded that fermenting sargassum flour with B. aerius resulted in a growing feed that rabbitfish can adequately utilize for 30% of the feed.
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