The teguments of four cestode species (Triaenophorus nodulosus, Proteocephalus torulosus, P. percae, P. cernuae) and the intestines of their freshwater fish hosts (Esox lucius, Barbatula barbatula, Perca fluviatilis, Gymnocephalus cernuus) inhabited by bacteria have been investigated with scanning electron microscopy. Most of the bacteria have sizes very similar to nanobacteria (that is, 0.25–0.3 μm in diameter). At least 4 microbial morphotypes were identified. These observations indicate that the normal indigenous microflora in cestodes and their fish hosts, associated with the digestive transport surfaces and consist of bacteria and nanobacteria.
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