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Microorganisms
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Host–Bacteria Interactions in Aquaculture Systems, 2nd Edition
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Host–Bacteria Interactions in Aquaculture Systems, 2nd Edition

A special issue of Microorganisms (ISSN 2076-2607). This special issue belongs to the section "Environmental Microbiology".

Deadline for manuscript submissions: 30 September 2024 | Viewed by 3703

Special Issue Editor

Dr. Pavlos Makridis

E-Mail Website
Guest Editor
Department of Biology, University of Patras, 26504 Rio, Greece
Interests: fish larvae; probiotics; miroalgae; oxygenation; recirculation aquaculture systems (RAS)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is the continuation of our previous Special Issue "Host–Bacteria Interactions in Aquaculture Systems".

In aquaculture systems (rearing systems for the culture of fish, crustacea, microalgae, or other aquatic organisms), there is an accumulation of organic load, which promotes the proliferation of bacteria. These bacterial populations interact with host organisms in complex ways. Aquaculture is a fast-growing industry, and there is a need to describe these interactions of the microbiome in water, biofilms, and rearing systems in general with the microbiome of the cultured organisms, as this will help to alleviate issues and improve conditions, as well as increasing the sustainability of the aquaculture industry worldwide.

Perturbations and imbalances of microbial communities often lead to the dominance of pathogens and disease problems. Several approaches have been suggested to avoid the use of chemotherapeutic agents in aquaculture. Manuscripts covering different aspects of the description of microbiomes in water or organisms are welcome, including the effect of the use of probiotics, antimicrobial activity of microalgae, environmental factors influencing the microbiome, diet influencing the microbiome, and outbreaks of pathogens under certain conditions.

Dr. Pavlos Makridis
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Microorganisms is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • host–bacteria interactions
  • microbial communities
  • aquaculture
  • aquatic organisms
  • probiotics

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Related Special Issue

Published Papers (3 papers)

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Research

17 pages, 2929 KiB  
Article
Genomic Insights into Edwardsiella ictaluri: Molecular Epidemiology and Antimicrobial Resistance in Striped Catfish (Pangasianodon hypophthalmus) Aquaculture in Vietnam
by Vera Irene Erickson, Tu Thanh Dung, Le Minh Khoi, Yaovi Mahuton Gildas Hounmanou, Tran Minh Phu and Anders Dalsgaard
Microorganisms 2024, 12(6), 1182; https://doi.org/10.3390/microorganisms12061182 - 11 Jun 2024
Cited by 1 | Viewed by 813
Abstract
Edwardsiella ictaluri is responsible for causing bacillary necrosis (BNP) in striped catfish (Pangasianodon hypophthalmus) in Vietnam. This study offers a comprehensive genomic characterization of E. ictaluri to enhance understanding of the molecular epidemiology, virulence, and antimicrobial resistance. E. ictaluri isolates were [...] Read more.
Edwardsiella ictaluri is responsible for causing bacillary necrosis (BNP) in striped catfish (Pangasianodon hypophthalmus) in Vietnam. This study offers a comprehensive genomic characterization of E. ictaluri to enhance understanding of the molecular epidemiology, virulence, and antimicrobial resistance. E. ictaluri isolates were collected from diseased striped catfish in the Mekong Delta. The species was confirmed through PCR. Antimicrobial susceptibility testing was conducted using minimum inhibitory concentrations for commonly used antimicrobials. Thirty representative isolates were selected for whole genome sequencing to delineate their genomic profiles and phylogeny. All strains belonged to ST-26 and exhibited genetic relatedness, differing by a maximum of 90 single nucleotide polymorphisms. Most isolates carried multiple antimicrobial resistance genes, with the tet(A) gene present in 63% and floR in 77% of the genomes. The ESBL gene, blaCTX-M-15, was identified in 30% of the genomes. Three plasmid replicon types were identified: IncA, p0111, and IncQ1. The genomes clustered into two clades based on their virulence gene profile, one group with the T3SS genes and one without. The genetic similarity among Vietnamese isolates suggests that disease spread occurs within the Mekong region, underscoring the importance of source tracking, reservoir identification, and implementation of necessary biosecurity measures to mitigate spread of BNP. Full article
(This article belongs to the Special Issue Host–Bacteria Interactions in Aquaculture Systems, 2nd Edition)
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16 pages, 2272 KiB  
Article
Early Succession of Community Structures and Biotic Interactions of Gut Microbes in Eriocheir sinensis Megalopa after Desalination
by Wenlei Xue, Hao Wu, Xinyu Wu, Nannan Li, Ximei Nie and Tianheng Gao
Microorganisms 2024, 12(3), 560; https://doi.org/10.3390/microorganisms12030560 - 11 Mar 2024
Viewed by 1315
Abstract
As an enduring Chinese freshwater aquaculture product, the Eriocheir sinensis has a high economic value and is characterized by a catadromous life style that undergoes seawater–freshwater migration. However, little is known about their gut microbial status as they move from saltwater to freshwater [...] Read more.
As an enduring Chinese freshwater aquaculture product, the Eriocheir sinensis has a high economic value and is characterized by a catadromous life style that undergoes seawater–freshwater migration. However, little is known about their gut microbial status as they move from saltwater to freshwater acclimatization. Here, we sampled and cultivated Eriocheir sinensis megalopa from three aquaculture desalination ponds and investigated their gut microbiota diversity, community structures and biotic interactions from megalopa stage to the first juvenile stage after desalination for 9 days. Our results revealed that during the transition from megalopa to the first juvenile in Eriocheir sinensis, a significant change in gut microbial composition was observed (for instance, changes in relative abundance of dominant phyla), which was, however, not influenced by different sampling sites. The species diversity (such as the richness) of the gut microbiota showed a hump-shaped pattern along the succession. However, the compositional differences of the gut microbes showed constantly increasing patterns during the succession after freshwater adaption for all three sampling sites. Further co-occurrence analysis also showed that the complexity of the ecological networks in gut microbes was significantly enhanced during the development, such as increasing numbers of network links, connectivity and modularity, and was confirmed by decreasing average path length and proportions of negative links. Taken together, the differences in community structures and biological interactions of gut microorganisms were more pronounced in Eriocheir sinensis megalopa during desalination than in diversity and species compositions. This implies that the gut microbes of Eriocheir sinensis megalopa would become more robust and adaptive during the developmental process. Full article
(This article belongs to the Special Issue Host–Bacteria Interactions in Aquaculture Systems, 2nd Edition)
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24 pages, 4400 KiB  
Article
Effect of Food Amounts on Larval Performance, Bacteriome and Molecular Immunologic Development during First-Feeding Culture of European Eel
by Kasun Anuruddha Bandara, Sebastian Nikitas Politis, Sune Riis Sørensen, Elisa Benini, Jonna Tomkiewicz and Olav Vadstein
Microorganisms 2024, 12(2), 355; https://doi.org/10.3390/microorganisms12020355 - 8 Feb 2024
Viewed by 999
Abstract
Production of European eel offspring has become a reality, but liquid diets during larval culture hold new challenges. This study focused on increasing food amounts without compromising well-being or healthy larvae-bacteria interactions. First-feeding larvae were fed two food amounts (Low = 0.5 mL [...] Read more.
Production of European eel offspring has become a reality, but liquid diets during larval culture hold new challenges. This study focused on increasing food amounts without compromising well-being or healthy larvae-bacteria interactions. First-feeding larvae were fed two food amounts (Low = 0.5 mL food/L water vs. High = 1.5 mL food/L water) until 30 days post-hatch (dph). Results indicated that ~75% of larvae ingested the diet in both treatments, but upregulation of a stress/repair-related gene (hsp90) on 25 and 30 dph indicated nutritional inadequacy. Larvae fed a High amount of food were 3.68% bigger, while larvae in the Low-food group showed 45.2% lower gut fullness and upregulated expression of the gene encoding the “hunger hormone” ghrelin (ghrl), indicating signs of starvation. The High-food group larvae exhibited a healthier bacteriome with a higher abundance of potentially beneficial orders (Lactobacillales and Bacillales), whereas the Low-food group showed more potentially harmful orders (Vibrionales, Rhodobacterales, and Alteromonadales). While survival was initially lower in the High-food group, both treatments had comparable survival by the end of the experiment. In conclusion, feeding European eel larvae with High food amounts seemed beneficial, supported by increased gut fullness, reduced ghrl expression (no starvation), enhanced growth, and the presence of a healthier bacteriome. Full article
(This article belongs to the Special Issue Host–Bacteria Interactions in Aquaculture Systems, 2nd Edition)
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