Caligus rogercresseyi infestation is associated with Piscirickettsia salmonis-attributed mortalities in farmed salmonids in Chile

Overview
TitleCaligus rogercresseyi infestation is associated with Piscirickettsia salmonis-attributed mortalities in farmed salmonids in Chile
AuthorsArriagada G, Hamilton-West C, Nekouei O, Foerster C, Müller A, Lara M, Gallardo-Escárate C
TypeJournal Article
Journal NamePreventive veterinary medicine
Volume171
IssueN/A
Year2019
Page(s)104771
CitationArriagada G, Hamilton-West C, Nekouei O, Foerster C, Müller A, Lara M, Gallardo-Escárate C. Caligus rogercresseyi infestation is associated with Piscirickettsia salmonis-attributed mortalities in farmed salmonids in Chile. Preventive veterinary medicine. 2019 Sep 06; 171:104771.

Abstract

Caligidosis and Piscirickettsiosis are currently the most important sanitary challenges for the Chilean salmon industry. Caligidosis is caused by the ectoparasite, Caligus rogercresseyi and Piscirickettsiosis is caused by the intracellular bacterium, Piscirickettsia salmonis. Both diseases are highly prevalent and widely distributed in farming areas in Chile. The co-occurrence of the two diseases is frequently reported on salmon farms. However, there is little epidemiological evidence as to whether these two diseases are associated and generate interactive effects. This study was undertaken to evaluate the potential effects of C. rogercresseyi infestation on P. salmonis-attributed mortalities in farmed salmonids in Chile. Using a linear regression model, the potential association between the mean abundance of adult C. rogercresseyi in a period of 10 weeks and Piscirickettsiosis cumulative mortalities observed in the following 10 weeks was evaluated, while controlling for important confounders. These two 10-week windows were set around the time-point at which Piscirickettsiosis weekly mortality exceeded 0.1% for the first time in a production cycle. We found that the mean abundance of adult C. rogercresseyi was significantly associated with the Piscirickettsiosis cumulative mortality, suggesting the two diseases have a synergistic relationship. This relationship was of the same intensity in Atlantic salmon and rainbow trout. Our findings highlight the importance of taking effective control measures for C. rogercresseyi as a part of the strategies in place to reduce P. salmonis-attributed mortalities on salmon farms in Chile.

Properties
Additional details for this publication include:
Property NameValue
Publication ModelPrint-Electronic
ISSN1873-1716
eISSN1873-1716
Publication Date2019 Sep 06
Journal AbbreviationPrev. Vet. Med.
PIIS0167-5877(19)30427-1
Elocation10.1016/j.prevetmed.2019.104771
DOI10.1016/j.prevetmed.2019.104771
CopyrightCopyright © 2019 Elsevier B.V. All rights reserved.
LanguageEnglish
Language Abbreng
Publication TypeJournal Article
Journal CountryNetherlands
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DatabaseAccession
PMID: PMID:31521964