Suppression of Streptococcosis and Modulation of the Gut Bacteriome in Nile Tilapia () by the Marine Sediment Bacteria Bacillus Haynesii and Advenella Mimigardefordensis

Overview

Journal Microbiol Spectr

Specialty Microbiology

Date 2022 Dec 1

PMID 36453920

Authors

Md Mahfuzur Rahman

Sulav Indra Paul

Ashikur Rahman

Md Shameul Haque

Md Ali Arman Ador

Md Javed Foysal

Md Tofazzal Islam

Md Mahbubur Rahman

Affiliations

Soon will be listed here.

Abstract

Streptococcosis is one of the major threats to Nile tilapia (Oreochromis niloticus) in most regions of the world. Recently, Enterococcus faecalis has been widely reported to be involved in streptococcosis in O. niloticus in Asia and Africa. This study aimed to isolate beneficial marine bacteria to evaluate their effects on growth, hematological parameters, nonspecific immunity, the gut bacteriome, and streptococcosis prevention efficacy in . A total of 36 marine soil bacteria were isolated, and screening was conducted to determine their antibacterial activities against fish pathogens. Two antagonistic bacteria were identified based on 16S rRNA gene sequencing, Bacillus haynesii CD223 and Advenella mimigardefordensis SM421. These bacteria were incorporated into fish feed and fed to for 90 days. The application of these strains via incorporation into fish feed significantly promoted growth, improved hematological parameters and immunoglobulin M (IgM) levels, modulated the gut bacteriome by reducing the load of pathogenic spp., and developed disease prevention efficacy in . Furthermore, assays revealed that the inclusion of extracellular products (ECPs) (at 250 μg mL) of CD223 and SM421 with feed significantly enhanced the rate of survival (100%) of from streptococcosis compared to the controls (only 30%). The ECPs of these bacteria also prevented 90 to 100% of fish from developing streptococcosis. These strains could be promising for safe use in farming to prevent and control the emergence of streptococcosis caused by E. faecalis. Nile tilapia () is one of the most economically important cultured fish species throughout the world. Streptococcosis is a significant threat to global Nile tilapia farming. Enterococcus faecalis has recently emerged as an important pathogen of streptococcosis in Asia and Africa. The application of antibiotics and probiotics and vaccination are the major ways to combat streptococcosis. However, the extensive use of antibiotics leads to the development of antibiotic resistance in pathogenic as well as environmental bacteria, which is a great threat to public health. There is no study on preventing streptococcosis caused by E. faecalis using beneficial bacteria. For the first time, the present study demonstrated that two marine bacteria, Bacillus haynesii strain CD223 and Advenella mimigardefordensis strain SM421, have great potential for controlling streptococcosis in Nile tilapia. These bacteria also enhanced the growth, improved hematological parameters and IgM levels, and positively modulated the gut bacteriome of Nile tilapia.

Citing Articles

Novel Sources of Biodiversity and Biomolecules from Bacteria Isolated from a High Middle Ages Soil Sample in Palermo (Sicily, Italy).

Vassallo A, Modi A, Quagliariello A, Bacci G, Faddetta T, Gallo M Microbiol Spectr. 2023; 11(3):e0437422.

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