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FISH VIRAL DISEASES

FISH VIRAL DISEASES. VIRUS MUST HAVE HOST TO SURVIVE AND REPLICATE. VIRION. SOME HAVE ADDITIONAL LIPID GLYCOPROTEIN COAT. Size of particles. VIRUS TYPES. DNA HERPESVIRUS, IRIDOVIRUSES RNA RABDOVORUSES, RETROVORUSES. Effects of Virus Infection. Histological changes CPE -.

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FISH VIRAL DISEASES

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  1. FISH VIRAL DISEASES • VIRUS MUST HAVE HOST TO SURVIVE AND REPLICATE

  2. VIRION • SOME HAVE ADDITIONAL LIPID GLYCOPROTEIN COAT

  3. Size of particles

  4. VIRUS TYPES • DNA • HERPESVIRUS, IRIDOVIRUSES • RNA • RABDOVORUSES, RETROVORUSES

  5. Effects of Virus Infection • Histological changes • CPE -

  6. Host Response/Outcome • No clinical disease • Clinical disease

  7. MANAGEMENT OPTIONS FOR VIRUSES • AVOID • VACCINATE • REDUCE RISKS

  8. DNA viruses -Herpes group • Channel catfish virus (CCV) • Oncorhynchus masou virus (OMV) • Walleye herpesvirus (WHV)

  9. DNA - Iridovirus • Lymphocystis Disease - LDV • Atlantic Cod Iridovirus • Viral Erythrocytic Necrosis -VEN • White Sturgeon Iridovirus • Viral Erythrocyte Inclusion BodySyndrome - EIBS

  10. Channel catfish virus • Acute disease • Clinical signs • Diagnosis

  11. Erythrocytic Inclusions • VEN • No Red Blood Cells • Diagnosis

  12. EIBS • First detected spring Chinook salmon LWS hatchery 1982. Hematocrits 2 - 50%

  13. RNA viruses Rhabdoviruses • IHNV • Infectious hematopoietic necrosis virus • VHSV • Viral Hemorrhage septicemia virus

  14. IHNV • Originated as three strains in Western North American salmonids • Signs • Diagnosis

  15. Strains and Virulence • Single stranded RNA genome that encodes five structural proteins. • Other factors affecting Virulence

  16. Attenuated Virus • Nan Scott Lake and Hagerman strains (multiple passages) • Vaccines

  17. IHNV Control Methods

  18. VHSV- Viral Haemorrhagic Septicemia Virus • Described in RBT in Denmark 1949

  19. VHSV • Signs • Diagnosis

  20. Marine Reservoir for Pacific Northwest Isolates • Herring Stocks affected severely

  21. Birnaviridae - IPNV • Infectious Pancreatic Necrosis

  22. IPN • Signs • Diagnosis

  23. IPNV • Inactivated by chlorine and iodine

  24. DI - DEFECTIVE INTERFERING PARTICLES • GENOME DEFFECTIVE

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