Marteilia
| Marteilia | |
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| Genus: | Marteilia Grizel, Comps, Bonami, Cousserans, Duthoit & Le Pennec, 1974 [1]
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Marteilia is a genus of Rhizaria. Species include Marteilia sydneyi and Marteilia refringens.[2]
Marteilia refringens is a unicellular parasite affecting the digestive system of the flat oyster, Ostrea edulis. Other species that can be infected include the Australian mud oyster (O. angasi), the Argentinean oyster (O. puelchana), the Chilean flat oyster (O. chilensis), the blue mussel (Mytilus edulis) and the Mediterranean mussel (M. galloprovincialis). Early stages of the life cycle occur in the epithelia of the digestive ducts and possibly the gills of the host. Later the parasite migrates to the epithelial cells of the digestive tubules. There may be no symptoms of infection. The factors triggering a pathogenic response are unclear but may be related to environmental stress. The gross signs of marteiliosis include the visceral tissues losing their pigmentation and becoming pale yellow. In some cases the mantle become translucent and shell growth may cease. Affected shellfish can become emaciated and in heavy infections tissues appear shrunken and slimy. Mortality seems to be related to the sporulation of the parasite.[3] The parasite was first observed in France in 1979 and has since spread to other countries in Europe.[4]
Marteilia sydneyi is a parasite of the Sydney rock oyster (Saccostrea glomerata) and causes QX disease. The parasite may be present without any signs being apparent. The gross signs of infection include colourless and translucent tissues because of resorption of the gonad and a pale yellow-brown digestive gland. The body may appear shrunken and in poor condition. Infections are found in the Asia Pacific regions and have been reported from Austraia.[5]
References
- ^ Victor Sprague (1979). "Classification of the Haplosporidia" (PDF). Marine Fisheries Review. 41: 40–44.
- ^ N. Carrasco, I. López-Flores, M. Alcaraz, M. D. Furones, F. C. Berthe & I. Arzul (2007). "Dynamics of the parasite Marteilia refringens (Paramyxea) in Mytilus galloprovincialis and zooplankton populations in Alfacs Bay (Catalonia, Spain)". Parasitology. 134 (11): 1541–1550. doi:10.1017/S0031182007003009. PMID 17623489.
{{cite journal}}: Unknown parameter|month=ignored (help)CS1 maint: multiple names: authors list (link) - ^ The Scottish Fish Health Inspectorate.
- ^ The geographical distribution of Marteilia refringens.
- ^ Aquatic Animal Diseases.
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