Isolation, identification, and evaluation of the characteristics of <em>Streptomyces</em> sp. as the probiotic strains applied in aquaculture

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dc.contributor.authorPham Thi, Tam
dc.contributor.authorNguyen Thi Thu, Hien
dc.contributor.authorVu Thi Bich, Huyen
dc.contributor.authorLe Thi Tuyet, Mai
dc.contributor.authorLe Minh, Hai
dc.contributor.authorTa Thi, Binh
dc.contributor.authorDao Thi Hong, Van
dc.contributor.authorVo Hong, Phuong
dc.contributor.authorVu Kim, Thoa
dc.contributor.authorDinh Thi Thu, Le
dc.contributor.authorMan Hong, Phuoc
dc.date.accessioned2024-08-23T00:24:55Z
dc.date.available2024-08-23T00:24:55Z
dc.date.issued2024
dc.description.abstractThe present study was conducted to select <em>Streptomyces</em> strains that exhibited characteristics of probiotics for application in aquaculture. <em>Streptomyces</em> were isolated from soil and sediment samples collected from various habitats such as riverside, shrimp ponds, pangasius ponds, mangrove forests, or estuaries along the coast of Vietnam. Two strains of <em>Streptomyces</em> (AG12.2 and ND10.1) were selected due to (1) their potent antimicrobial activity against common pathogens that cause serious diseases in shrimp and pangasius such as <em>E. ictaluri</em>, <em>A. hydophila</em>, <em>V. harveyi</em>, <em>V. parahaemolyticus</em>, and (2) their superior ability to produce several extracellular enzymes that strongly hydrolyze organic compounds such as starch, CMC, and skimmed milk, compared to other strains. AG12.2 and ND10.1 can tolerate salinity from 0 ppt to 5 ppt and pH from 3 to 8; however, their growth is most vigorous at salt concentrations and pH between 0 ppt to 2 ppt, and 7.2 to 8, respectively. <em>In</em> <em>vivo</em> evaluation on <em>L. vannamei</em> in this study shows that shrimp that were fed with diets containing AG12.2 and ND10.1 had WG (%) increasing by 1.59 times and 1.61 times respectively, DGW (g/day) increasing by 1.64 times, and FCR decreasing by 1.30 times and 1.35 times respectively. The shrimp treated with AG12.2 and ND10.1 were then challenged with <em>V. parahaemolyticus</em>, resulting in a survival rate increase of 3.9 times and 3.71 times, respectively. Phylogenetic analysis revealed that strains AG12.2 and ND10.1 belong to <em>Streptomyces kunmingensis</em> and <em>Streptomyces angustmyceticus</em>, respectively. The findings of the present study led to the conclusion that <em>Streptomyces kunmingensis</em> AG12.2 and <em>Streptomyces angustmyceticus</em> ND10.1 are excellent candidates for producing beneficial probiotics for aquaculture.
dc.identifier.doihttps://doi.org/10.46989/001c.121927
dc.identifier.issn0792-156X
dc.identifier.urihttps://hdl.handle.net/10524/77275
dc.relation.ispartofThe Israeli Journal of Aquaculture - Bamidgeh
dc.subjectStreptomyces sp.
dc.subjectantibacterial
dc.subjectextracellular enzymes
dc.subjectsalt and pH tolerance
dc.subjectsurvival
dc.subjectgrowth performance
dc.subjectaquaculture
dc.titleIsolation, identification, and evaluation of the characteristics of <em>Streptomyces</em> sp. as the probiotic strains applied in aquaculture
dc.typeArticle
dc.type.dcmiText
prism.volume76

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Volume 76, Issue 3, 2024