Aeromonas salmonicida, causative agent of salmonid furunculosis, isolated from the freshwater parasitic copepod, Salmincola californiensis.
density dependence
fish
host
parasite
transovarial transmission
Journal
Journal of fish diseases
ISSN: 1365-2761
Titre abrégé: J Fish Dis
Pays: England
ID NLM: 9881188
Informations de publication
Date de publication:
10 Nov 2023
10 Nov 2023
Historique:
revised:
23
10
2023
received:
20
07
2023
accepted:
27
10
2023
medline:
10
11
2023
pubmed:
10
11
2023
entrez:
10
11
2023
Statut:
aheadofprint
Résumé
Here, we provide evidence that the freshwater parasitic copepod, Salmincola californiensis, acts as a vector for Aeromonas salmonicida. While investigating the effects of S. californiensis on Chinoook salmon (Oncorhynchus tshawytscha), we tangentially observed that fish infected with the copepod developed furunculosis, caused by A. salmonicida. This occurred despite being reared in pathogen-free well water in a research facility with no prior history of spontaneous infection. We further investigated the possibility of S. californiensis to serve as a vector for the bacterium via detection of fluorescently labelled A. salmonicida inside the egg sacs from copepods in which the fish hosts were experimentally infected with GFP-A449 A. salmonicida. We then evaluated copepod egg sacs that were collected from adult Chinook salmon from a freshwater hatchery with A. salmonicida infections confirmed by either culture or PCR. The bacterium was cultured on tryptic soy agar plates from 75% of the egg sacs, and 61% were positive by PCR. These three separate experiments indicate an alternative tactic of transmission in addition to direct transmission of A. salmonicida in captivity. The copepod may play an important role in transmission of the bacterium when fish are more dispersed, such as in the wild.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Oregon Department of Fish and Wildlife
Informations de copyright
© 2023 John Wiley & Sons Ltd.
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