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White-spot syndrome virus (WSSV) is adevastating, infectious virus affecting shrimp. Although sensitivefarmers in screening shrimp (brood stock) for WSSV prior tostocking ponds, such practices have not yet ben aplied inKorea. Despite the rationality of implementing screening,there has been some doubt as to whether the stocking ofWSSV-PCR-negative fry epidemiologically decreases white-spot disease outbreaks. Here, we report a retrospectiveanalysis of data from shrimp farms in the western coast ofKorea where WSSV-PCR-negative brod stocks were used toA total of 366 shrimp from HeuksanIsland were sampled for WSSV with PCR. Of the testedshrimp, 7.2% (28 brood stocks) were identified as WSVpositive; only WSSV-PCR-negative shrimp were used forbrood stocks. Total unit production (final shrimp production/the area of the ponds) was higher, at 1.96, in ponds whereWSSV-PCR-negative shrimp were used, as compared with1.02 in other ponds in Korea in 2004. This retrospectiveaquaculture industry, suggesting a testable hypothesis that maycontribute to the eventual control of WSSV outbreaks.

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