DISSEMINATION OF THE VIRAL AND BACTERIAL INFECTIONS IN AQUACULTURE AND ANALYSIS OF EPIZOOTIC SITUATION IN BULGARIA
Keywords:
AQUACULTURE, BACTERIAL INFECTIONSAbstract
A specialized system for registration of freshwater fish producers in accordance with the new Directive 2006/88/EC will be established soon in our country. Bulgarian Food safety Agency, Department of
Health Animal Control and National reference laboratory for fish and molluscs diseases carried out the
official programme for control of viral fish diseases.
The surveillance programme of viral diseases includes general regulations concerning clinical health
inspections with criteria for sampling and specific regulations for prevention, control and eradication in
accordance with the requirements of the European legislation. The level of surveillance will be related
both to the recognized health status and to the risk of contracting and spreading of diseases into/out of
the farm or farming area.
VHS is the most important viral diseases occurred in our trout farms. The first isolation of Viral haemorrhagic septicaemia virus was done in December 2007. There were also outbreaks of Viral haemorrhagic septicaemia in farmed rainbow trout in March 2008 and in November 2008. IPN first emerged
as a serious problem in Bulgaria during the last three year, when virus was detected in four trout farms.
The epidemiological update on the current health situation showed that Yersiniosis (Y.ruckeri), Bacterial
kidney disease (Renibacterium salmoninarum) and Aeromonosis (Aeromonas salmonicida) being the
main problems in different trout farming regions. Based on the information received, it appears that our
country is IHN and KHV free. First case of Spring viraemia of carp (SVC) was diagnosed in 2010 in
one carp farm. The most important bacterial diseases encountered in carp farms are Erythrodermatitis –
motil aeromonads mainly A. hydrophilla and Ps. fluorescens.
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