Isolation of VHS Virus from Pike Fry (Esox lucius) with Hemorrhagic Symptoms
In the early summer of 1978 we received pike fry for examination because of a disease outbreak in a hatchery on the Hallwilersee, an average-sized inland lake, in Switzerland. The fry, which originated from Hallwilersee, had been kept on a plankton diet for 3 weeks in the hatchery, in filtered lakewater, when the first signs of disease occurred. During a seven-day period, the hatchery lost a total of about 120,000 pike fry; close to 100% of the population. The mortality occurred shortly after an increase of the water temperature from 12 °C to 14 ° – 15 °C. In most circumstances the time between onset of symptoms and death was less than 2 days. During this hatching period no other species of fish were present in the hatchery. The fry, 2.5–3.5 cm long, had overall exophthalmus and pronounced reddening of the flanks and, less frequently, the middle of the skull. The gills were very pale. Dissection of the fry revealed ascites and hemorrhages in the kidney area.
KeywordsFiltration Retina Conglomerate Tray
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- Bootsma R (1976) Studies on two infections diseases of cultured freshwater fish. Rhabdovirus Disease of Pike Fry (Esox lucius L). Columnaris Disease of carp (Cyprinus caprio L). Thesis University of Utrecht, p 41Google Scholar