Benjamin R. LaFrentz

Passive immunization with anti-virulent Aeromonas hydrophila whole serum protects Channel Catfish against motile Aeromonas septicemia

Allison L. Wise, Benjamin H. Beck, Troy J. Bader, Benjamin R. LaFrentz et autres

OBJECTIVE: Recently, we demonstrated the efficacy of oral bacterin virulent Aeromonas hydrophila (vAh) vaccines (S14-452 and ML09-119) in Channel Catfish Ictalurus punctatus, but gaps in knowledge exist with respect to protective immunity induced by vAh bacterins. Specific antibodies were proposed as a …

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Emergence, identification, and characterization of a novel Streptococcus agalactiae CPS type Ia ST7 strain (Ia-2021) causing large scale mortalities in tilapia aquaculture

Benjamin R. LaFrentz, Paola Barato, William R. Keleher, Amber E. Johnston et autres

In 2021 streptococcosis caused by Streptococcus agalactiae capsular polysaccharide (CPS) type Ia ST7 (referred to as Ia-2021) emerged in Mexico and spread to other regions in Central and South America devastating the industries in the affected countries. To address this emergent issue, …

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Viability of probiotic C6-6 in fish feed and ability to inhibit columnaris-causing bacteria in rainbow trout Oncorhynchus mykiss

Ryan Maxwell, Jie Ma, Benjamin R. LaFrentz, Shelby Swearingen et autres

Probiotics are increasingly recognized as sustainable alternatives to antibiotics in aquaculture. This study evaluated the viability and disease-mitigating potential of the candidate probiotic Lelliotia amnigena strain C6-6 in rainbow trout Oncorhynchus mykiss. Viability was assessed under varying storage temperatures (-15, 4, and …

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Effects of supplemental dietary blend of humic substances and butyric acid plus yeast cell walls on immunity and resistance to bacterial coinfection in juvenile Channel Catfish

Abdulmalik A. Oladipupo, Anita M. Kelly, Benjamin R. LaFrentz, D Allen Davis et autres

OBJECTIVE: The present study examined the effect of humic substance and butyric acid blend (HSB) supplementation, with and without yeast cell wall (YCW), on gut morphology, immunity, and resistance to Flavobacterium covae, Edwardsiella ictaluri, and their coinfection in juvenile Channel Catfish Ictalurus …

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Performance and Health Status of Juvenile Largemouth Bass ( Micropterus nigricans ) Fed Inclusions of Enzyme‐Treated and Low‐Oligosaccharide Soy Proteins

Jamison L. Semla, Chia‐Tsen Chiang, Trinh H V Ngo, D. Allen Davis et autres

ABSTRACT Plant‐based proteins, such as soybean meal (SBM), have shown promising results in cultured species but also present challenges due to their nutrient composition and inherent antinutritional factors. This study investigated how the replacement of solvent‐extracted SBM with low oligosaccharide soybean meal …

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An Optimized Method for Efficient Conjugal Transfer in Flavobacterium covae

Stacey LaFrentz, Hannah Smith, Benjamin R. LaFrentz, Jake Tatum et autres

ABSTRACT The fish pathogen Flavobacterium covae causes significant mortality and there is a need to better understand virulence factors that contribute to its pathogenesis. Few highly virulent F. covae strains may be genetically manipulated with existing conjugal transfer methods, therefore the aim …

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Genotypic, phenotypic, and serologic characterization of Edwardsiella ictaluri isolates from catfish and ornamental fish from the southeastern USA

Divya Rose, Benjamin R. LaFrentz, Ethan T. Woodyard, Geoffrey C. Waldbieser et autres

This study explores the phenotypic, genotypic, and serological differences among Edwardsiella ictaluri isolated from farm-raised catfish Ictalurus spp. and ornamental fish (Danio spp. and Puntius tetrazona) in the USA. Plasmid analyses revealed diverse plasmid profiles, with varied antimicrobial resistance genes indicating diverse …

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Use of shotgun immunoproteomics for the development of protein vaccines against Edwardsiella piscicida

Kim L. Jacobsen, Matt J. Griffin, Brett S. Phinney, Michelle Salemi et autres

Edwardsiella piscicida is an important emerging pathogen in various cultured fish species. This study aimed to identify immunogenic E. piscicida proteins and evaluate these antigens as protein vaccines for use in aquaculture. Shotgun immunoproteomics using anti-E. piscicida serum from rainbow trout (Oncorhynchus …

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Genome sequencing and hybrid assembly of Edwardsiella ictaluri isolates recovered from various fish species

Nithin Muliya Sankappa, Jason Abernathy, Miles D. Lange, Benjamin R. LaFrentz et autres

ABSTRACT The bacterium Edwardsiella ictaluri causes disease in finfish and has been shown to infect multiple species. Eleven E. ictaluri genomes were sequenced, assembled, and annotated from a collection of isolates recovered from several different finfish species. This will serve as a …

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Fantastic Flavos—An Introduction to the Special Issue, Flavobacteria: Current Status and Future Directions

Benjamin R. LaFrentz, Thomas P. Loch, Timothy J. Bruce

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Evaluation of processed soy ingredients for largemouth bass (Micropterus nigricans) fingerlings on growth performance, intestinal health, and disease susceptibility

Jamison L. Semla, Ian A.E. Butts, D. Allen Davis, Abdulmalik A. Oladipupo et autres

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An Overview of Vaccine Development Strategies for Columnaris‐Causing Bacteria in Cultured Fish

Courtney E. Harrison, Benjamin R. LaFrentz, Craig A. Shoemaker, Miles D. Lange et autres

Columnaris disease, caused by columnaris-causing bacteria (CCB), affects cultured and wild freshwater fish worldwide. Belonging to the phylum Bacteroidota and the family Flavobacteriaceae, CCB are gram-negative, yellow-pigmented bacteria that are presumed ubiquitous in freshwater habitats. Since the first report of the disease …

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