We studied amoebae associated with nodular gill disease (NGD) outbreaks in rainbow trout Oncorhynchus mykiss (Walbaum) in fish farms in South-Western Germany. Gills of 12 diseased rainbow trout were examined in fresh, by isolation attempts, histologically and using in situ hybridisation (ISH). A total of nine amoeba strains of the genera Acanthamoeba (1), Hartmannella (2), Naegleria (1), Protac...

Salmon gill disease in Norway is most cases associated with a range of different pathogens, stress and environmental factors. Paramoeba perurans other amoebae have been isolated during such outbreaks. Other from salmon include P. pemaquidensis, Tetramitus sp. Vannella Here we tested the pathogenicity first 2 species challenge experiments. We found that even when clonal cultures pemaquidensis es...

Small subunit ribosomal RNA gene sequences were determined for 5 amoeba strains of the genus Neoparamoeba Page, 1987 that were isolated from gills of Scophthalmus maximus (Linnaeus, 1758). Phylogenetic analyses revealed that 2 of 5 morphologically indistinguishable strains clustered with 6 strains identified previously as N. pemaquidensis (Page, 1970). Three strains branched as a clade separate...

Amoebae play an important ecological role as predators in microbial communities. They also serve as niche for bacterial replication, harbor endosymbiotic bacteria and have contributed to the evolution of major human pathogens. Despite their high diversity, marine amoebae and their association with bacteria are poorly understood. Here we describe the isolation and characterization of two novel m...

Free-living amoebae infecting freshwater and marine fish include those described thus far as agents of fish diseases, associated with other disease conditions and isolated from organs of asymptomatic fish. This survey is based on information from the literature as well as on our own data on strains isolated from freshwater and marine fish. Evidence is provided for diverse fish-infecting amphizo...

In the soils of forest-steppe zone Ukraine we found 12 morphotypes naked amoebae: eruptive (Vahlkampfa sp. (1), Vahlkampfa (2), Willaertia sp.), politactic (Polychaos dubium Schaeffer, 1917, Deuteramoeba mycophaga Page, 1988), monotactic (Saccamoeba stagnicola 1974, Hartmannella vermiformis 1967, Cashia limacoides 1974), lens-like (Cochliopodium (1)), striate (Thecamoeba striata Penard, 1890, T...

A new species of naked amoeba, Platyamoeba pseudovannellida n.sp., is described on the basis of light microscopic and fine structural features. The amoeba was isolated from the Salton Sea, California, from water at a salinity of ca. 44%. Locomotive amoebae occasionally had a spatulate outline and floating cells had radiating pseudopodia, sometimes with pointed tips. Both these features are remi...