Abstract
A case of skin alterations and mortalities associated with Yersinia ruckeri in two summer old common carp after over-wintering in a hibernation pond is described in the present work. The disease was characterised mainly by erosions around the orbital area of the fish. The bacterium was cultivated on Columbia agar and identified by MALDI-TOF, by biochemical characteristics and by sequencing 16s rDNA. Parasitological and virological examinations revealed no relevant findings. Usually the pathogen is associated with salmonids, which were not present on the farm investigated in this study.
Highlights
Fish in most hibernation ponds were not diseased
Some fish showed carperythrodermatitis-like ulcers on their caudal peduncle or at the base of their fins
Swab samples from affected skin, liver, kidney and spleen of four severely affected fish were streaked for bacteriology onto Columbia agar supplemented with 7 % sheep’s blood and incubated for two days at 22-26 °C
Summary
Fish in most hibernation ponds were not diseased. Only fish in one particular pond with a size of 1.92 hectare were affected. (the latter only in altered regions) in the skin scrapes, as well as low to moderate levels of parasites in the gill samples (Ichthyobodo sp., Chilodonella sp., Trichodina sp.). Landesuntersuchungsanstalt is a routine diagnostic laboratory, standardisation of procedures with regards to incubation of bacterial cultures is required even though some fish are kept at other temperatures.
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