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Lactococcosis in Silver Carp.

Lester H Khoo1, Frank W Austin, Sylvie M A Quiniou

  • 1a College of Veterinary Medicine , Mississippi State University , Post Office Box 197 , Stoneville , Mississippi , 38776 , USA.

Journal of Aquatic Animal Health
|April 3, 2014
PubMed
Summary
This summary is machine-generated.

This study reports the first natural infection of Silver Carp (Hypophthalmichthys molitrix) by Lactococcus lactis subsp. lactis. The bacterium caused severe meningoencephalitis and other lesions in the affected fish.

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Area of Science:

  • Aquatic microbiology
  • Fish pathology
  • Bacterial genomics

Background:

  • Silver Carp (Hypophthalmichthys molitrix) are important aquaculture species.
  • Bacterial infections can cause significant losses in fish populations.
  • Lactococcus lactis subsp. lactis is known to cause disease in other animals.

Purpose of the Study:

  • To identify the causative agent of a disease outbreak in Silver Carp.
  • To characterize the bacterium isolated from affected fish.
  • To report the first natural infection of Silver Carp by Lactococcus lactis subsp. lactis.

Main Methods:

  • Bacterial isolation and culture from fish tissues (brain, kidney, muscle).
  • Biochemical characterization of bacterial isolates.
  • Molecular identification using 16S small subunit ribosomal DNA (SSU rDNA) and DNA gyrase subunit B (gyrB) gene sequencing.
  • Histopathological examination of affected tissues.

Main Results:

  • A pure Gram-positive cocci isolate was identified as Lactococcus lactis subsp. lactis.
  • Genetic analysis confirmed high identity to L. lactis subsp. lactis and low similarity to related species.
  • Histopathology revealed severe meningoencephalitis, myositis, and nephritis.

Conclusions:

  • Lactococcus lactis subsp. lactis is identified as the cause of disease in Silver Carp.
  • This is the first documented case of natural L. lactis subsp. lactis infection in Silver Carp.
  • The findings contribute to understanding bacterial diseases in aquaculture species.