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Diseases of Aquatic Organisms

    DAO prepress abstract   -  DOI: https://doi.org/10.3354/dao03462

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

    María Fernanda Martínez-García, José Manuel Grijalva-Chon*, Reina Castro-Longoria, Enrique de la Re-Vega, Alejandro Varela-Romero, Jorge Eduardo Chávez-Villalba

    *Corresponding author:

    ABSTRACT: 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, so in the absence of systematic studies, monthly samples of Crassostrea gigas, water, and sediment were taken in the La Cruz coastal lagoon and analyzed by PCR. The native species Dosinia ponderosa, which lives outside the lagoon, was taken as a control. The virus was found throughout the year only in C. gigas, with prevalence up to 60%. Nine genotype variants were detected and genetic analysis suggested that linear genotypic evolution had occurred from strain JF894308, present in La Cruz in 2011. There was no evidence of the entry of new viral genotypes in the recent past, so the confinement of the virus within the lagoons of the Gulf of California could promote large genotypic diversity in the short term.