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A comparison between non-destructive and destructive testing of Atlantic salmon, Salmo salar L., broodfish for IPNV--destructive testing is still the best at time of maturation



A comparison between non-destructive and destructive testing of Atlantic salmon, Salmo salar L., broodfish for IPNV--destructive testing is still the best at time of maturation



Journal of Fish Diseases 31(3): 187-195



Two populations of Atlantic salmon broodstock, previously identified as infectious pancreatic necrosis virus (IPNV) carriers, were screened for IPNV at the time of stripping. Four hundred and ten broodfish were individually sampled of which 91 were detected as IPNV positive by virus culture of sonicated kidney homogenates combined with gonadal fluid, but none tested positive by the blood leucocyte assay. Thirty fish identified as IPNV carriers prior to maturation by the blood leucocyte assay were used in a separate study to compare non-destructive vs. destructive testing methods at stripping. IPNV was not detected using the blood leucocyte method at the time of stripping. RT-PCR and real-time PCR assays failed to detect IPNV from 13 blood samples, the virus was not isolated from milt (0/14) or sonicated ovarian fluid cell pellets (0/16) and only three fish tested positive by the standard culture of kidney homogenates. A third study of Atlantic salmon broodfish compared the IPNV isolation rates prior to maturation with the isolation rates at spawning during 1999-2001. In each year the percentage of IPNV-positive broodfish was significantly lower than in the pre-broodstock sample. While in pre-broodfish samples IPNV was detected by the blood leucocyte assay, no culture isolations or PCR positives were detected from non-destructive samples of the same individual broodfish at stripping. A consistent finding was that even for the kidney assay, the percentage of IPNV-positive fish in carrier populations was higher in pre-broodstock than in broodfish at stripping. These results indicate that destructive kidney sampling is still the most sensitive method for detecting IPNV carrier Atlantic salmon broodfish and that a change in IPNV carrier-status occurs during the maturation period.

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Accession: 051109103

Download citation: RISBibTeXText

PMID: 18261032

DOI: 10.1111/j.1365-2761.2007.00887.x


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