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Ismail, Norshida
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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 Gracilaria 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 like Bacillus subtilis, however only by 99.43%.
Modulation of Gut Microbiota, Nutrient Transport Gene Expression, and Growth of Red Hybrid Tilapia (Oreochromis sp.) Fed with Black Soldier Fly (Hermetia illucens) by Oral Probiotics Latifah, Ma'rufa Nurul; Murti, Fauziah Arelia Usmiara; Helmiati, Senny; Ismail, Norshida; Syakuri, Hamdan; Istiqomah, Indah; Murwantoko, Murwantoko; Isnansetyo, Alim
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.95268

Abstract

Maggot Black Soldier Fly (BSF) is a nutritionally rich alternative food for fish. The slow digestibility requires the combination with other technologies to produce fish with excellent growth. This study aims to investigate the impact of probiotic application on the growth, microbiome, and gene expression in the intestines of tilapia-fed black soldier fly (BSF) larvae. Tilapia intestines were examined after two months of rearing with three replications and two treatments: A) 30% maggots and 70% commercial pellets with probiotics, and B) 30% maggots and 70% commercial pellets without probiotics. We discovered that probiotics have a significant impact on the gut microbiomes of fish and their absolute growth. The amplicon sequence variant in the probiotic treatment (A) was 25, with dominance by Cetobacterium, Acinetobacter, Enhydrobacter, and Gemmobacter, while the non-probiotic treatment (B) was 8, with dominance by Cetobacterium and Turicibacter. The probiotic treatment increased the expression of Ghrelin, Muc-2, IL-1β, and I-FABP genes, but not the CD36 gene. These findings suggest oral probiotics can help boost tilapia production when fed maggot black soldier fly (Hermetia illucens).
Co-Authors Abdullah, Faisal Zain ALIM ISNANSETYO INDAH ISTIQOMAH Latifah, Ma'rufa Nurul Murti, Fauziah Arelia Usmiara Murwantoko . Senny Helmiati Syakuri, Hamdan Yasa, Ngurah Sedana