Carp edema virus and koi herpesvirus were the most prevalent viral pathogens of the Czech common carp (Cyprinus carpio) in 2020

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027162%3A_____%2F21%3AN0000186" target="_blank" >RIV/00027162:_____/21:N0000186 - isvavai.cz</a>

Result on the web

<a href="https://www.delegate-reg.co.uk/eafp-2021/" target="_blank" >https://www.delegate-reg.co.uk/eafp-2021/</a>

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Carp edema virus and koi herpesvirus were the most prevalent viral pathogens of the Czech common carp (Cyprinus carpio) in 2020

Original language description

20th International Conference on Diseases of Fish and Shellfish, 20-23. 9. 2021. On-line. Common carp (Cyprinus carpio) is the most important fish species farmed in the Czech Republic, with the annual production of circa 20 000 tonnes. Infectious diseases decrease the profitability of the carp aquaculture, with a notifiable disease – koi herpesvirus (KHV) disease, and an emerging disease – carp edema virus (CEV) disease, causing the largest losses in the last few years. Methodology: Samples were obtained by the State Veterinary Administration during KHV surveillance program (556 samples from 96 locations) or directly from common carp farmers or koi carp breeders who reported clinical signs of a disease (81 samples from 28 locations). The gill and internal organ tissue was pooled, homogenised and the total DNA and viral RNA were extracted. Presence of KHV, CEV and carp sprivivirus (SVCV) was confirmed using real-time PCR. Partial P4a gene sequences of detected CEV isolates were obtained via Sanger sequencing. Results: In total, four locations were confirmed KHV positive and five ponds were depopulated, with 252.5 tonnes of fish euthanized due to control measures. CEV was diagnosed in six locations, of which four represent the common carp farmers and two koi carp breeders. Clinical signs in these cases varied from asymptomatic (two locations) to koi-sleepy-disease-like symptoms in both of the koi breeders to a 100% mortality rate in one of the common carp farms. Phylogenetically, two of the established CEV genogroups were detected, namely genogroup I in common carp and genogroup IIa in koi. SVCV was detected in one location, without the presence of any clinical or patho-anatomical signs. None of the samples showed co-infection of viral pathogens. Conclusions: Viral diseases still pose a threat to the carp aquaculture in the Czech Republic. Besides the direct losses via mortalities and decreased weight gains, mandatory control measures against the spread of KHV decrease the profitability even further.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

10607 - Virology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů