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Title: Continuous Exposure to Infectious Pancreatic Necrosis Virus (IPNV) During Early Life Stages of Rainbow Trout, Oncorhynchus mykiss, Walbaum

Author
item Bebak, Julie
item MCALLISTER, PHILLIP - USGS NAT. FISH HLTH LAB

Submitted to: Annual Eastern Fish Health Workshop
Publication Type: Abstract Only
Publication Acceptance Date: 3/15/2008
Publication Date: 3/31/2008
Citation: Bebak, J.A., Mcallister, P.E. 2008. Continuous Exposure to Infectious Pancreatic Necrosis Virus (IPNV) During Early Life Stages of Rainbow Trout, Oncorhynchus mykiss, Walbaum. In: Proceedings of the Annual Eastern Fish Health Workshop, March 31 - April 4, 2008, Atlantic Beach, North Carolina. p. 25.

Interpretive Summary:

Technical Abstract: Rainbow trout (Oncorhynchus mykiss, Walbaum) were exposed continuously to infectious pancreatic necrosis virus (IPNV) at 0, 10, 1,000, or 10,000 pfu/L of water to estimate the effects of chronic IPNV exposure on early life stages. Fish density averaged 35 fish/L (low) or 140 fish/L (high), and water flow rate through tanks was 250 mL/min. Virus exposure began at 6 d before hatch and continued until fish were 44 d old. Discrete-time event analysis was used to explore patterns of survival and mortality. Mortality that was significantly greater than in the 0 pfu/L (control) exposure did not occur until IPNV concentration was 10,000 pfu/L at low fish density and 1,000 pfu IPNV/L at high fish density. These results suggest that in the natural aquatic environment, where rainbow trout densities are likely to be considerably lower than in this study, mortality resulting from infection with IPNV will very likely not occur when ambient concentrations of virus are less than or equal to 1,000 pfu IPNV/L. In aquaculture rearing units, trout density may be as high or higher than the densities used in this study, and under such density conditions continuous inputs of IPNV at concentrations greater than or equal to 10 pfu/L may result in IPN epidemics.