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A Summer Mortality Outbreak of Lactococcosis by Lactococcus garvieae in a Raceway System Affecting Farmed Rainbow Trout (Oncorhynchus mykiss) and Brook Trout (Salvelinus fontinalis)

Animals publica este artículo de investigación

29 de noviembre de 2019

Lactococcosis is a fish disease of major concern in Mediterranean countries caused by Lactococcus garvieae. The most susceptible species is the rainbow trout (Oncorhynchus mykiss), suffering acute disease associated with elevated mortalities compared to other fish species. References reported that other salmonids are also susceptible to the disease, but no mortality outbreak has been described to date. The aim of this study was to present a mortality outbreak that occurred in brook trout (Salvelinus fontinalis) farmed in northwestern Italy during the summer of 2018. Fish exhibited clinical signs, such as exophthalmos, diffused hemorrhages localized in the ocular zone, hemorrhagic enteritis, and enlarged spleen. L. garvieae was isolated in all fish. Molecular and epidemiological characterization of the isolates, through Pulsed Field Gel Electrophoresis (PFGE), confirmed the initial hypothesis of water as vehicle of infection favoring transmission between rainbow trout farmed in upstream compartments and brook trout located in downstream tanks. Moreover, several environmental conditions affected and promoted the outbreak, among them the high-water temperature, which probably induced a physiological stress in brook trout, being way above the optimal temperature for this species, increasing the susceptibility to infection




Pastorino P., Vela AI., Colussi S., Cavazza G., Menconi V., Mugetti D., Righetti M., Barbero R., Zuccaro G., Fernandez-Garayzabal JF., Dondo A., Acutis PL. y Prearo M.




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A Summer Mortality Outbreak of Lactococcosis by Lactococcus garvieae in a Raceway System Affecting Farmed Rainbow Trout (Oncorhynchus mykiss) and Brook Trout (Salvelinus fontinalis)

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A Summer Mortality Outbreak of Lactococcosis by Lactococcus garvieae in a Raceway System Affecting Farmed Rainbow Trout (Oncorhynchus mykiss) and Brook Trout (Salvelinus fontinalis)


Participantes:

Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d`AostaIstituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d`Aosta (IZSPLV).

Universidad ComplutenseServicio de Identificación y Caracterización Microbiana (ICM). Centro de Vigilancia Sanitaria Veterinaria (VISAVET). Universidad Complutense (UCM).

Azienda Sanitaria Locale di BiellaAzienda Sanitaria Locale di Biella.







Animals
FACTOR YEAR Q
1.431 2018

NLMID: 101635614

PMID: 31795312

ISSN: 2076-2615



TÍTULO: A Summer Mortality Outbreak of Lactococcosis by Lactococcus garvieae in a Raceway System Affecting Farmed Rainbow Trout (Oncorhynchus mykiss) and Brook Trout (Salvelinus fontinalis)


REVISTA: Animals (Basel)


NUMERACIÓN: 9(12)


AÑO: 2019


EDITORIAL: MDPI


AUTORES: Pastorino P., Vela AI., Colussi S., Cavazza G., Menconi V., Mugetti D., Righetti M., Barbero R., Zuccaro G., Fernandez-Garayzabal JF., Dondo A., Acutis PL. and Prearo M.


PARTICIPANTES VISAVET


2nd
Ana Isabel Vela Alonso
10th
José Francisco Fernández-Garayzabal Fernández

DOI: https://doi.org/10.3390/ani9121043


CITA ESTA PUBLICACIÓN:

Pastorino P., Vela AI., Colussi S., Cavazza G., Menconi V., Mugetti D., Righetti M., Barbero R., Zuccaro G., Fernandez-Garayzabal JF., Dondo A., Acutis PL. y Prearo M. A Summer Mortality Outbreak of Lactococcosis by Lactococcus garvieae in a Raceway System Affecting Farmed Rainbow Trout (Oncorhynchus mykiss) and Brook Trout (Salvelinus fontinalis). Animals. 9(12). 2019. (A). ISSN: 2076-2615. DOI: 10.3390/ani9121043


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