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All Journal Jurnal Perikanan Universitas Gadjah Mada
Yasa, Ngurah Sedana
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology

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Agarolytic Bacillus sp. FRAgK1 Screened from Gracilaria (Rhodophyta) Thallus as Probiotic Candidate for Abalone Abdullah, Faisal Zain; Istiqomah, Indah; Isnansetyo, Alim; Yasa, Ngurah Sedana; Ismail, Norshida
Jurnal Perikanan Universitas Gadjah Mada Vol 26, No 2 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfs.93662

Abstract

Agarolytic bacteria produce agarase, which may aid in the growth of cultured tropical abalone fed natural seaweed. Agarolytic bacteria can come from a variety of sources, such as seawater, abalone intestines, and dead seaweed. This study aimed to isolate, screen, describe, and identify agarolytic bacteria found in red macroalgae. Agarolytic bacteria isolated from Gracillaria segregated from the substrate at Drini Beach, Gunungkidul Regency, were qualitatively described using the agarolytic index, antibiotic susceptibility, acid resistance (pH 4), and safety test. We collected seven agarolytic isolates. FRAgK1 isolate had the highest agarolytic index, was sensitive to antibiotics, resistant to low pH conditions, and non-pathogenic to finfish, making it suitable for use as gut probiotics in abalone. The bacterium was short rod-shaped, Gram-positive, non-motile, lacked catalase and indol, and was unable to ferment lactose or sucrose. The 16S rRNA gene sequence of FRAgK1 was most similar to Bacillus subtilis, however only by 99.43%.
Co-Authors Abdullah, Faisal Zain ALIM ISNANSETYO INDAH ISTIQOMAH Ismail, Norshida