Pacific herring were susceptible to waterborne challenge with viral haemorrhagic septicaemia virus (VHSV) throughout their early life history stages, with significantly greater cumulative mortalities occurring among VHSV-exposed groups of 9-, 44-, 54- and 76-day-old larvae than among respective control groups. Similarly, among 89-day- 1-year-old and 1+year old post-metamorphosed juveniles, cumulative mortality was significantly greater in VHSV-challenged groups than in respective control groups. Larval exposure to VHSV conferred partial protection to the survivors after their metamorphosis to juveniles as shown by significantly less cumulative mortalities among juvenile groups that survived a VHS epidemic as larvae than among groups that were previously naïve to VHSV. Magnitude of the protection, measured as relative per cent survival, was a direct function of larval age at first exposure and was probably a reflection of gradual developmental onset of immunocompetence. These results indicate the potential for easily overlooked VHS epizootics among wild larvae in regions where the virus is endemic and emphasize the importance of early life history stages of marine fish in influencing the ecological disease processes. (VHS); (VHSv); (viral hemorrhagic septicemia); (viral haemorrhagic septicaemia); (viral hemmorrhagic septicemia)
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General
Monitoring
Aquatic Nuisance Species
General
- Scope of Study
Scope of StudyLaboratory Investigation
- Scale of Phenomena
Scale of PhenomenaCellularOrganism
- Impact of Pollutants
Impact of PollutantsExotic Species
- Processes
- Land Use and Habitat
- Resource Management
Resource ManagementFisheries
- Socio-Economic
- State / Province
- Lake Basin / Connecting Channels
Monitoring
- Purpose of Project
- Frequency
- Number of Sampling Entities
- Data Availability
- Region Being Monitored
- Resource Being Monitored
Resource Being MonitoredFisheries
- Program Drivers
- Beneficial Use Impairment Assessments
Beneficial Use Impairment AssessmentsFish Tumours or Other DeformitiesLoss of Fish and Wildlife HabitatTainting of Fish and Wildlife Populations
Aquatic Nuisance Species
- Biology And Life History
Biology And Life HistoryParasites and Diseases
- Control And Mitigation
- Ecosystem Effects
- Prevention and Introduction
- Socio-economic Consideration and Analysis
- Spread of Established ANS Populations