First report and characterization of Tenacibaculum maritimum isolates recovered from rainbow trout (Oncorhynchus mykiss) farmed in Chile

Sara Valdes, Rute Irgang, María C. Barros, Pedro Ilardi, Mónica Saldarriaga-Córdoba, Javier Rivera–Bohle, Enrique Madrid, Johana Gajardo–Córdova, Ruben Avendaño-Herrera

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

Resumen

The present study reports on the first isolation of Tenacibaculum maritimum in rainbow trout (Oncorhynchus mykiss) farmed in Chile. In March 2020, two cages raising rainbow trout (~250 g) in the Los Lagos Region suffered a disease outbreak. In total, 17,554 fish died (3.5%–4.8% accumulated mortality). Microbiological analysis of the diseased fish obtained two representative isolates (i.e. Tm-035 and Tm-036). These were obtained from the external gross skin lesions—typical of tenacibaculosis—of two fish. Phenotyping, PCR tests and sequencing of the 16S rRNA and housekeeping genes confirmed the isolates as T. maritimum. The pathogenic potential of Tm-035 was further assessed by bath challenging Atlantic salmon (Salmo salar), which killed 70 ± 15% of fish within 11 days. Dead fish presented the same external clinical signs as did the farmed rainbow trout specimens. This research further broadens the known host distribution of this pathogen. Furthermore, the virulence experiments demonstrated that T. maritimum does not have a specific host. Additional studies are needed to evaluate the risk of T. maritimum for the O. mykiss farming industry.

Idioma originalInglés
PublicaciónJournal of Fish Diseases
DOI
EstadoEn prensa - 2021

Áreas temáticas de ASJC Scopus

  • Ciencias acuáticas
  • Veterinaria (miscelánea)

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