Epidemiology of Salmonid Rickettsial Septicemia (SRS) in Farmed Salmon: The Role of Sea Lice Infestations in Mortality Risk

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dc.catalogadorjlo
dc.contributor.authorDiethelm‐Varela, Benjamín
dc.contributor.authorAtero Fredericksen, Nicolhole Alejandra
dc.contributor.authorCórdova‐Bührle, Francisca
dc.contributor.authorRezende Landaeta, Enrico
dc.contributor.authorGelcich, Stefan
dc.contributor.authorSandoval, Osvaldo
dc.contributor.authorNavarro, Carlos
dc.contributor.authorMardones Loyola, Fernando Otoniel
dc.date.accessioned2025-12-12T15:32:01Z
dc.date.available2025-12-12T15:32:01Z
dc.date.issued2025
dc.description.abstractPiscirickettsia salmonis , the causal agent of salmonid rickettsial septicemia (SRS), is the main pathogen affecting farmed salmonids in Chile. Outbreaks of SRS lead to substantial economic losses for producers. Many determinants related to SRS outcomes are still poorly understood. Here, we conducted a retrospective cohort study from 2014 to 2021 to investigate the epidemiology of SRS at the farm level in southern Chile, employing historical monitoring data. Using time series analysis of weekly SRS mortality risk and sea lice ( Caligus rogercresseyi ) infestation levels, we found that SRS mortality risk had a strong seasonal component, with mortalities being significantly higher in the warmer seasons. While Caligus infestation levels have increased significantly over the years, SRS mortality risk has remained constant. Using mixed effects regression models, we identified that a key predictor for both increased weekly SRS mortality risk and higher hazard of reporting the first SRS outbreak of a production cycle was the level of female egg‐laying sea lice. We hypothesise that the interaction between sea lice, P. salmonis and rising water temperatures may produce synergistic stress on salmon that accelerates disease progression and prompts overuse of antimicrobials. This calls for an urgent integrated pest management approach in aquaculture practice.
dc.fuente.origenORCID
dc.identifier.doi10.1111/jfd.70097
dc.identifier.urihttps://doi.org/10.1111/jfd.70097
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/107384
dc.information.autorucEscuela de Medicina; Atero Fredericksen, Nicolhole Alejandra; 0000-0002-4312-1609; 1124121
dc.information.autorucFacultad de Ciencias Biológicas; Rezende Landaeta, Enrico; 0000-0002-6245-9605; 104299
dc.information.autorucEscuela de Medicina Veterinaria; Mardones Loyola, Fernando Otoniel; 0000-0003-1228-5392; 1084534
dc.language.isoen
dc.nota.accesocontenido parcial
dc.revistaJournal of Fish Diseases
dc.rightsacceso restringido
dc.subject.ddc570
dc.subject.ods03 Good health and well-being
dc.subject.ods14 Life below water
dc.subject.odspa03 Salud y bienestar
dc.subject.odspa14 Vida submarina
dc.titleEpidemiology of Salmonid Rickettsial Septicemia (SRS) in Farmed Salmon: The Role of Sea Lice Infestations in Mortality Risk
dc.typeartículo
sipa.codpersvinculados1124121
sipa.codpersvinculados104299
sipa.codpersvinculados1084534
sipa.trazabilidadORCID;2025-12-09
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