Prevalence and genotypic diversity of ostreid herpesvirus type 1 in Crassostrea gigas cultured in the Gulf of California, Mexico

In bivalve mollusk aquaculture, massive disease outbreaks with high mortality and large economic losses can occur, as in northwest Mexico in the 1990s. A range of pathogens can affect bivalves; one of great concern is ostreid herpesvirus 1 (OsHV-1), of which there are several strains. This virus has...

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Bibliographic Details
Published in:Diseases of aquatic organisms 2020-03, Vol.138, p.185-194
Main Authors: Martínez-García, María Fernanda, Grijalva-Chon, José Manuel, Castro-Longoria, Reina, Re-Vega, Enrique de, Varela-Romero, Alejandro, Chávez-Villalba, Jorge Eduardo
Format: Article
Language:English
Subjects:
Animals
Aquaculture
Bivalvia
California
Crassostrea
Crassostrea gigas
DNA Viruses
Economic impact
Genetic analysis
Genotype
Genotypes
Lagoons
Mexico
Mollusks
Oysters
Prevalence
Viruses
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Summary:In bivalve mollusk aquaculture, massive disease outbreaks with high mortality and large economic losses can occur, as in northwest Mexico in the 1990s. A range of pathogens can affect bivalves; one of great concern is ostreid herpesvirus 1 (OsHV-1), of which there are several strains. This virus has been detected in the Gulf of California in occasional or sporadic samplings, but to date, there have been few systematic studies. Monthly samples of Crassostrea gigas, water, and sediment were taken in the La Cruz coastal lagoon and analyzed by PCR. The native mollusk, Dosinia ponderosa, which lives outside the lagoon, was sampled as a control. The virus was found throughout the year only in C. gigas, with prevalence up to 60%. In total, 9 genotype variants were detected, and genetic analysis suggests that linear genotypic evolution has occurred from strain JF894308, present in La Cruz in 2011. There has been no evidence of the entry of new viral genotypes in the recent past, thus confinement of the virus within the lagoons of the Gulf of California could promote a native genotypic diversity in the short term.
ISSN:0177-5103
1616-1580
DOI:10.3354/dao03462