Photomicrographs of parasitic Tetrahymena species isolated from Harbin in vivo (A-D, F, H, K) and after silver carbonate staining (E, G, J, L). (A, B) Views of numerous parasitic Tetrahymena sp. in low magnification. (C-E) Tetrahymena pyriformis. (F, G) Tetrahymena vorax. (H-J) Tetrahymena chironomi. (K, L) Tetrahymena bergeri, arrowhead shows caudal cilium. Scale bars: 100 μm (A, B), 25 μm (C, D, F-L), 10 μm (E).

Photomicrographs of parasitic Tetrahymena species isolated from Harbin in vivo (A-D, F, H, K) and after silver carbonate staining (E, G, J, L). (A, B) Views of numerous parasitic Tetrahymena sp. in low magnification. (C-E) Tetrahymena pyriformis. (F, G) Tetrahymena vorax. (H-J) Tetrahymena chironomi. (K, L) Tetrahymena bergeri, arrowhead shows caudal cilium. Scale bars: 100 μm (A, B), 25 μm (C, D, F-L), 10 μm (E).

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Background Tetrahymenosis caused by about ten parasitic Tetrahymena species belonging to the Phylum Ciliophora has been recognized as an emerging problem inflicting significant economic loss in aquaculture industry in the world. Increasing knowledge and identification of Tetrahymenosis are important. Methods Four parasitic Tetrahymena species were...

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... cells commonly showed a high densities and vitalities when just isolated from the various fishes (Figs 1, 2). The detailed morphology of the four species are reported before, and the Harbin populations of the four species are similar with those previous descriptions ( Figure 2) [1,3,7,42]. The topologies of BI trees are similar to that of ML trees, so only the ML trees are shown in Figure 4 with branch support values for both analyses. ...