Tid:Mandag 29. april kl 12:30-13:15 NB! MERK TIDEN.
Sted: Fellesauditoriet, Ullevålsveien 76, Oslo

Ønsker du å følge fagseminarene via internett:

1. Åpne siden http://tcs.vetinst.no
2. Brukernavn: Streaming - Passord: Streaming (merk stor S)
3. Klikk på fagseminaret med dagens dato. Klikk også på pilen på bildet. Du vil nå se dagens møte.
    - NB: Klikk F5 for oppdatering av nettsiden hvis møtet ikke vises.

Eksterne som har Cisco-kompatibelt videokonferanseutstyr, og vil delta på seminaret kan ringe opp 514705@vetinst.no

David Huchzermeyer has been in mixed private veterinary practice in Lydenburg, South Africa, since 1986. His practice provides a fish and crocodile consultation, diagnostic and pathology (including histopathology) service. He consults throughout the southern African region. Over the years he has presented many courses on various aspects of fish health to role players in the aquaculture industry as well as to hobbyists and colleagues, and has published several papers on his work with fish and crocodiles. Since 2012 he has been an honorary Research Associate in the Department of Ichthyology and Fisheries Science at Rhodes University, Grahamstown and has been co-presenter of training courses on aquatic animal diseases for veterinarians throughout Africa on behalf of the World Animal Health Organization (OIE). For many years he has been closely involved with the disease free certification process required for trout ova and koi for export to the EU. Furthermore, he is a Title 50 certifying official for salmonid exports to the USA.
Dr. Huchzermeyer was part of the team from Rhodes University that first confirmed epizootic ulcerative syndrome as the cause of ulcerations in wild fish in the Chobe and upper Zambezi Rivers in 2007. Since 2008 he has been studying the pathology present in the fish of the lower Olifants River in the Kruger National Park in the area where crocodiles have been dying of pansteatitis and this has been the subject of his PhD thesis.

Peter Britz a professor in the Department of Ichthyology and Fisheries Science at Rhodes University. Prof Britz is specializing in the development of aquaculture technology for indigenous aquatic species. His research has played a key role in the development of the abalone aquaculture industry which produces over 1000t of abalone worth R350 million p.a. and employs 2000 people. Other research interests include the trans-disciplinary research on fishery governance and the human dimension of fisheries.
Peter Britz provides advice on aquaculture and fisheries policy and development planning to government, development agencies and private companies. Completed contracts include aquaculture and fishery policy and sector development plans; fishery management plans; aquaculture technical feasibility studies, business planning and due diligence appraisals, an economic and sectoral study of the South African fishing industry, and aquaculture industry status reports.

Abstract of lecture:
Pansteatitis in African sharptooth catfish, Clarias gariepinus (Burchell), in the Kruger National Park, South Africa
Repeated field studies, using detailed autopsy, histopathology, haematology and blood chemistry techniques, have demonstrated an increasing prevalence of pansteatitis in catfish in the Olifants Gorge, an area where significant numbers of large crocodiles have died of the same disease in 2008 and 2009. The relative instability of certain polyunsaturated fats found in some prey fish when consumed by catfish exert a level of oxidative stress capable of overwhelming the natural anti-oxidant defence mechanisms of the animal, in particular vitamin E. In experimental studies it was demonstrated that pansteatitis lesions in catfish do not heal over time and that lesions may be cumulative and debilitating. A chain reaction, initiated by oxidative breakdown of fats in the adipose tissues, leading to death of fat cells and release of breakdown products of fat oxidation was responsible for the acute and chronic inflammation typical of the pathology observed in the catfish. In the Kruger National Park, pansteatitis in sharptooth catfish was shown to be a serious problem in the inlets to large man-made lakes fed by rivers arising in the polluted catchments of the Olifants and Sabie rivers. The results of this study present the first record of pansteatitis in both wild and farmed African sharptooth catfish and emphasize the ecological importance and complexity of nutritional oxidative stress in a disturbed aquatic environment. The author proposes that nutrient entrapment and the consumption of phytoplankton-feeding fish rich in polyunsaturated fats, particularly silver carp, Hypophthalmichthys molitrix (Valenciennes), a species alien to Africa but present in the Olifants River, was the dietary cause of the pansteatitis.