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Fishes 2018, 3(4), 42; https://doi.org/10.3390/fishes3040042

Outbreak of Mortality Associated with Acipenser Iridovirus European (AcIV-E) Detection in Siberian Sturgeon (Acipenser baerii) Farmed in Sweden

1
Swedish National Veterinary Institute (SVA), 751 89 Uppsala, Sweden
2
National Institute of Aquatic Resources, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
3
Istituto Zooprofilattico Sperimentale delle Venezie, 35020 Legnaro, Italy
*
Author to whom correspondence should be addressed.
Received: 5 September 2018 / Revised: 27 September 2018 / Accepted: 5 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Viral Diseases of Fish and Shellfish)
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Abstract

Infectious disease is a major challenge in aquaculture and poses a constraint for the development of farming of new species. In 2017, Siberian sturgeon (Acipenser baerii) juveniles were imported from Italy to a Swedish farm. Transport conditions were suboptimal. Thirty percent died during transport and within the first days after arrival. Ten days after arrival, mortalities started to occur again, which prompted initiation of an investigation into the mortalities. Diseased fish were transported live to the National Veterinary Institute (SVA) for necropsy and further analysis. Pathological and histopathological investigation was conducted. Virology was performed on gills and internal organs by cell culture isolation and using specific PCR protocols against nervous necrosis virus (NNV) and Acipenser iridovirus European (AcIV-E). The juveniles displayed neurological signs such as lethargy, inability to maintain an upright position, and erratic swimming. Body condition was below normal, and gills were pale. One fish had petechial hemorrhages on the abdomen and the snout. Two specimens had intestinal hyperemia. Ventricles were air-filled, and swim bladders were deflated. Viral cell cultures gave negative results, but PCR analysis of gills and internal organs detected the presence of AcIV-E. We conclude that AcIV-E was associated with disease and high mortality in the sturgeon juveniles, and stress probably aggravated the course of the infection. View Full-Text
Keywords: siberian sturgeon; central nervous system signs; Acipenser iridovirus European; viral nervous necrosis; Acipenser herpesvirus; gas bubble disease; polymerase chain reaction siberian sturgeon; central nervous system signs; Acipenser iridovirus European; viral nervous necrosis; Acipenser herpesvirus; gas bubble disease; polymerase chain reaction
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Axén, C.; Vendramin, N.; Toffan, A. Outbreak of Mortality Associated with Acipenser Iridovirus European (AcIV-E) Detection in Siberian Sturgeon (Acipenser baerii) Farmed in Sweden. Fishes 2018, 3, 42.

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