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First report and characterization of Tenacibaculum maritimum isolates recovered from rainbow trout ( Oncorhynchus mykiss ) farmed in Chile
Author(s) -
Valdes Sara,
Irgang Rute,
Barros María C.,
Ilardi Pedro,
SaldarriagaCórdoba Mónica,
Rivera–Bohle Javier,
Madrid Enrique,
Gajardo–Córdova Johana,
AvendañoHerrera Ruben
Publication year - 2021
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/jfd.13466
Subject(s) - rainbow trout , biology , salmo , outbreak , fish farming , aquaculture , fishery , brown trout , zoology , pathogen , veterinary medicine , fish <actinopterygii> , microbiology and biotechnology , virology , medicine
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.