Observation on a Enteromyxum leei (Myxozoa Myxosporea) Parasitosis on Farming Sea Bream Sparus aurata

Autor: G. Lefebvre, E. Jublanc, N. Elkiric, M. Toubiana, J. Sri Widada, C. Sauvegrain, A. Le Breton, Adam Marques
Rok vydání: 2005
Předmět:
Zdroj: The Journal of Eukaryotic Microbiology. 52:28S-34S
ISSN: 1550-7408
1066-5234
Popis: Enteromyxum leei parasitic infestation was first identified in 2001 on the site. Two years of investigations on this disease, when the infestation become detectable by light microscopic observation of the spores, it was observed that rearing parameters have very liitle influence on the evolution of the pathology, which then leads to heavy losses. This parasitic infestation is characterized by the location of the myxosporidia in the host (the digestive track), the absence of cyst formation and the occurrence of an amplification of the parasite development. PCR techniques allow to diagnose the first stages of the infestation on fish juvenile stages but have sofar not allowed the detection of a potential intermediate host. The epidemiological observations on site allowed recommending some actions to interfere with the life cycle of the parasite (cleaning of water channels should limit the prevalence of potential intermediate hosts) and adapting heath management to reduce the pressure of the pathogen (date of introduction of fingerlings on site, water temperature, oxygen level, flow rates). Two different hypotheses can explain the development of the disease in the present case on this site: (1) either a population of parasites in extension with a sexual reproduction and a complete life cycle on the site (2) or an asexual reproduction, such as a clone developing within the rearing structure and whose expansion may be related to transports of live fish and farming activities. The set up of health management procedures able to efficiently control the disease is strongly related to the understanding of this specific point.
Databáze: OpenAIRE
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