Fish farm “Rajska dolina”

Increased mortality-real scenario-

24.4.2014

• On 23.4.2014 the owner of the farm reported to a colleague an increased mortality in rainbow trout fry.

• On 24.4.2014 we visited the farm and started the epidemiological investigation.

• The farm in operating with its own hatchery and water source and there is no record of movement of live fish into the farm.

• Ten days ago the farmer noted increasing mortality in the fry which he started to treat with OTC (3 days) - increasing mortality and salt (3 days) resulting with a slightly decreased mortality.

• Ten day mortality 130.000 fry (65%).• Clinically, the fish were lethargic, anorexic with

erratic swimming and light and dark pigmentation.

• The gills were necrotic with gray patches, the body was decolorized, the gall bladder was full, yellow pigmentation of the intestine, hyperemic pyloric caeca, liver and spleen without changes.

• We took samples for laboratory examination.• The farm is now under official surveillance and

restricted movement was implemented.