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Ott Knusel F.,Fishdoc GmbH | Knusel R.,Fishdoc GmbH | Doherr M.G.,Free University of Berlin | Schmidt-Posthaus H.,University of Bern
Diseases of Aquatic Organisms | Year: 2016

Koi carp presenting with coelomatic neoplastic lesions are of growing importance in Switzerland and elsewhere in Europe, as clinical diagnosis is usually difficult and prognosis is usually poor because of late recognition. To gain more information about this condition, between 2008 and 2012, 117 koi diagnosed with coelomatic tumours were included in this study. The nature and growth characteristics of these pathologic tissues were documented. Out of 117 koi, 48.9% (n = 57) were female; the ovary was the most often affected organ (35%, n = 41), and in 62.4% (n =73) of cases, the cells of origin were identified as stromal cells of the sex-cord and the tumours were identified as sex-cord stromal tumours. The characteristics of growth and histology showed that the majority of tumours were malignant. © Inter-Research 2016. Source


Schmidt-Posthaus H.,University of Bern | Diserens N.,University of Bern | Hjortaas M.J.,Norwegian Veterinary Institute Ullevalsveien 68 | Knusel R.,Fishdoc GmbH | And 2 more authors.
Diseases of Aquatic Organisms | Year: 2014

Sleeping disease is a contagious disease mainly of freshwater farmed rainbow trout, caused by salmonid alphavirus (SAV) Subtype 2. Here we describe the first case in Switzerland. Pathological changes ranged from acute pancreas necrosis to more chronic lesions with complete loss of exocrine pancreas and simultaneous degenerative, inflammatory and regenerative heart and. muscle lesions. The partial sequencing of SAV E2 and nsp3 genes placed the Swiss SAV variant within the Subtype 2 clustering together with freshwater isolates from UK and continental Europe. Although mortality stayed low, growth rates were significantly reduced, making the disease economically relevant. © Inter-Research 2014. Source


Schmidt-Posthaus H.,University of Bern | Bergmann W.,University of Bern | Knusel R.,Fishdoc GmbH | Heistinger H.,Tierklinik Lilienfeld | Licek E.,University of Veterinary Medicine Vienna
Diseases of Aquatic Organisms | Year: 2010

Red mark syndrome (RMS) or cold water strawberry disease (CWSD) is a non-lethal skin disease of rainbow trout Oncorhynchus mykiss that is of high economic importance in the UK. The disease is temperature-dependent, with up to 60% morbidity at water temperatures below 15°C. Although CWSD is horizontally transmissible, the aetiology is still unknown. Here we describe the first cases of RMS on the European mainland in the alpine regions of Switzerland and Austria. In Switzerland, morbidity remained around 1% after the first outbreak, whereas in Austria no further cases were diagnosed. © Inter-Research 2009. Source


Knusel F.O.,Fishdoc GmbH | Doherr M.G.,Institute for Veterinary Epidemiology and Biostatistics | Knusel R.,Fishdoc GmbH | Wahli T.,University of Bern | Schmidt-Posthaus H.,University of Bern
Diseases of Aquatic Organisms | Year: 2015

Fish, like mammals, can be affected by neoplastic proliferations. As yet, there are only a very small number of studies reporting on the occurrence of tumours in koi carp Cyprinus carpio koi and only sporadic reports on the nature of the tumours or on risk factors associated with their development. Between 2008 and 2012, koi with abdominal swelling were examined pathologically: neoplastic lesions were diagnosed and classified histologically. We evaluated possible risk factors for the development of these internal neoplasms in koi carp in Switzerland, using an online 2-part questionnaire sent to fish keepers with koi affected by internal tumours and to fish keepers who had not previously reported any affected koi. Part 1 addressed all participants and focused on general information about koi husbandry and pond technical data; Part 2 addressed participants that had one or several case(s) of koi with internal tumour(s) between 2008 and 2012, and consisted of specific questions about affected koi. A total of 112 internal tumours were reported by the 353 koi keepers participating in the survey. Analysis of the obtained data revealed that tumour occurrence was significantly associated with the location (indoors vs. outdoors) and volume of the pond, frequency of water changes, origin of the koi, number of koi kept in a pond and the use of certain pond disinfectant/medication products. Our results contribute to the identification of possible risk factors, which in turn could help to establish prophylactic measures in order to reduce the occurrence of internal neoplasms in koi. © Inter-Research 2015. Source

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