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Related Experiment Video

Updated: Sep 24, 2025

Multi-locus Variable-number Tandem-repeat Analysis of the Fish-pathogenic Bacterium Yersinia ruckeri by Multiplex PCR and Capillary Electrophoresis
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An Efficient Tetraplex Surveillance Tool for Salmonid Pathogens.

Ulla von Ammon1, Tessa Averink1, Karthiga Kumanan1,2

  • 1Aquaculture & Marine Biosecurity, Cawthron Institute, Nelson, New Zealand.

Frontiers in Microbiology
|May 9, 2022
PubMed
Summary
This summary is machine-generated.

A new droplet digital PCR (ddPCR) tetraplex assay offers rapid, high-throughput fish disease surveillance for New Zealand salmon farms. This molecular tool enables timely intervention against key salmon pathogens.

Keywords:
Chinook salmonOncorhynchus tshawytschaaquatic animal healthdroplet digital PCRfish diseasemultiplex assay

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Area of Science:

  • Aquatic animal health
  • Molecular diagnostics
  • Aquaculture pathology

Background:

  • Traditional fish disease surveillance is slow and labor-intensive, hindering rapid response in aquaculture.
  • Molecular assays, particularly droplet digital PCR (ddPCR), offer speed and high throughput for pathogen detection.
  • Multiplexing targets in a single assay can further improve efficiency for disease surveillance.

Purpose of the Study:

  • To develop and validate a ddPCR tetraplex assay for simultaneous detection of four priority salmon pathogens in New Zealand.
  • To assess the assay's performance, including limit of detection and specificity.
  • To demonstrate the practical application of the tetraplex assay in a commercial fish disease surveillance program.

Main Methods:

  • Development of a ddPCR tetraplex assay targeting New Zealand Rickettsia-like organism 1 (NZ-RLO1), NZ-RLO2, Tenacibaculum maritimum, and Yersinia ruckeri.
  • Determination of the limit of detection (LOD) for each target in both singleplex and tetraplex formats.
  • Evaluation of primer specificity and assessment of cross-reactivity with related bacterial strains.
  • Application of the tetraplex assay in a year-long commercial fish disease surveillance program.

Main Results:

  • The ddPCR tetraplex assay achieved low limits of detection for all target pathogens, with most targets reaching 10-9 ng/μl.
  • Specific LODs varied by target, with NZ-RLO1 at 0.14 copies/μl and Y. ruckeri at 0.7 copies/μl in the tetraplex assay.
  • Cross-reactivity was observed between T. maritimum and Tenacibaculum dicentrarchi, and between Y. ruckeri and Serratia liquefaciens.
  • The assay proved applicable in a real-world commercial surveillance setting over one year.

Conclusions:

  • The developed ddPCR tetraplex assay is a sensitive and efficient tool for simultaneous detection of key salmon pathogens.
  • This molecular approach significantly enhances fish disease surveillance capabilities for the New Zealand salmonid aquaculture industry.
  • The assay facilitates timely intervention strategies, contributing to improved farm biosecurity and fish health management.