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Evaluation of Channel Catfish Virus Latency on Fingerling Production Farms in Mississippi
Author(s) -
Thompson David J.,
Khoo Lester H.,
Wise David J.,
Hanson Larry A.
Publication year - 2005
Publication title -
journal of aquatic animal health
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.507
H-Index - 52
eISSN - 1548-8667
pISSN - 0899-7659
DOI - 10.1577/h04-048.1
Subject(s) - catfish , ictalurus , biology , broodstock , salmo , virus , fishery , veterinary medicine , aquaculture , virology , fish <actinopterygii> , medicine
Channel catfish virus disease (CCVD) is an economically important disease to the channel catfish Ictalurus punctatus industry. Channel catfish virus develops a latent infection and is vertically transmitted from broodstock to offspring. In this study, the presence of latent channel catfish virus (CCV) in fry at 3–5 d of age was evaluated, via polymerase chain reaction, on five farms in the Delta region of Mississippi. We found over 10% of the fry sampled were positive for latent CCV on all five farms. Additionally, on one of those farms the presence of latent CCV was evaluated in three ponds through a typical CCVD season. Regression analysis of the CCV carrier level demonstrated an increase, but no overt CCVD outbreaks occurred and no CCV was cultured from the fish tissues in cell culture. Our results indicate that CCV is endemic in most channel catfish populations under commercial production in Mississippi and suggests that subclinical transmission of CCV does occur.