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Epitheliocystis Distribution and Characterization in Brown Trout (Salmo trutta) from the Headwaters of Two Major European Rivers, the Rhine and Rhone.

Guevara Soto M, Vaughan L, Segner H, Wahli T, Vidondo B, Schmidt-Posthaus H - Front Physiol (2016)

Bottom Line: Additionally, in two rivers in the Rhine catchment, a new species of Candidatus Similichlamydia was identified.Based on the histology, infection intensity, and severity of pathological changes were significantly more pronounced in mixed chlamydial infections, whereas single infections showed only low numbers of cysts and mild pathology.Infections could be found over a wide range of temperatures, which showed no correlation to infection prevalence or intensity.

View Article: PubMed Central - PubMed

Affiliation: Department of Infectious Diseases and Pathobiology, Centre of Fish and Wildlife Health, University of Bern Bern, Switzerland.

ABSTRACT
We present a first description of the distribution and characterization of epitheliocystis infections in brown trout (Salmo trutta) from the upper catchments of two major European rivers, the Rhine and the Rhone. Overall, epitheliocystis was widely distributed, with 70% of the Rhine and 67% of the Rhone sites harboring epitheliocystis positive brown trout. The epitheliocystis agents Candidatus Piscichlamydia salmonis and Candidatus Clavichlamydia salmonicola could be identified in both catchments, although their relative proportions differed from site to site. Additionally, in two rivers in the Rhine catchment, a new species of Candidatus Similichlamydia was identified. Based on the histology, infection intensity, and severity of pathological changes were significantly more pronounced in mixed chlamydial infections, whereas single infections showed only low numbers of cysts and mild pathology. Infections could be found over a wide range of temperatures, which showed no correlation to infection prevalence or intensity.

No MeSH data available.


Related in: MedlinePlus

Geographical distribution of infected (red) and non-infected sites (blue) in Rhine (green areas) and Rhone (red area) catchments. Red, Rhone region; bright green, Rhine region; light green, Limmat region; dark green, Aare region. Beside the locations, the river number (names and according numbers are given in Table 1), number of infected animals, and total number of investigated animals is given.
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Figure 1: Geographical distribution of infected (red) and non-infected sites (blue) in Rhine (green areas) and Rhone (red area) catchments. Red, Rhone region; bright green, Rhine region; light green, Limmat region; dark green, Aare region. Beside the locations, the river number (names and according numbers are given in Table 1), number of infected animals, and total number of investigated animals is given.

Mentions: From June to November 2012, wild young-of-the-year (YOY) brown trout were collected in 52 rivers, whereby 42 rivers belonged to the Rhine catchment and 10 rivers to the Rhone catchment (Figure 1). The sampling took place in the frame of a nationwide project aiming to assess the health status of trout in Swiss rivers. In most of the rivers, one sampling site was selected, but in 6 rivers up to 7 sampling sites along the course of the rivers were included. In total, 46 sampling sites were included from the Rhine catchment, 18 sampling sites belonged to the Rhone. Brown trout were sampled by electrofishing over a stretch of 100 m at each site.


Epitheliocystis Distribution and Characterization in Brown Trout (Salmo trutta) from the Headwaters of Two Major European Rivers, the Rhine and Rhone.

Guevara Soto M, Vaughan L, Segner H, Wahli T, Vidondo B, Schmidt-Posthaus H - Front Physiol (2016)

Geographical distribution of infected (red) and non-infected sites (blue) in Rhine (green areas) and Rhone (red area) catchments. Red, Rhone region; bright green, Rhine region; light green, Limmat region; dark green, Aare region. Beside the locations, the river number (names and according numbers are given in Table 1), number of infected animals, and total number of investigated animals is given.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4834352&req=5

Figure 1: Geographical distribution of infected (red) and non-infected sites (blue) in Rhine (green areas) and Rhone (red area) catchments. Red, Rhone region; bright green, Rhine region; light green, Limmat region; dark green, Aare region. Beside the locations, the river number (names and according numbers are given in Table 1), number of infected animals, and total number of investigated animals is given.
Mentions: From June to November 2012, wild young-of-the-year (YOY) brown trout were collected in 52 rivers, whereby 42 rivers belonged to the Rhine catchment and 10 rivers to the Rhone catchment (Figure 1). The sampling took place in the frame of a nationwide project aiming to assess the health status of trout in Swiss rivers. In most of the rivers, one sampling site was selected, but in 6 rivers up to 7 sampling sites along the course of the rivers were included. In total, 46 sampling sites were included from the Rhine catchment, 18 sampling sites belonged to the Rhone. Brown trout were sampled by electrofishing over a stretch of 100 m at each site.

Bottom Line: Additionally, in two rivers in the Rhine catchment, a new species of Candidatus Similichlamydia was identified.Based on the histology, infection intensity, and severity of pathological changes were significantly more pronounced in mixed chlamydial infections, whereas single infections showed only low numbers of cysts and mild pathology.Infections could be found over a wide range of temperatures, which showed no correlation to infection prevalence or intensity.

View Article: PubMed Central - PubMed

Affiliation: Department of Infectious Diseases and Pathobiology, Centre of Fish and Wildlife Health, University of Bern Bern, Switzerland.

ABSTRACT
We present a first description of the distribution and characterization of epitheliocystis infections in brown trout (Salmo trutta) from the upper catchments of two major European rivers, the Rhine and the Rhone. Overall, epitheliocystis was widely distributed, with 70% of the Rhine and 67% of the Rhone sites harboring epitheliocystis positive brown trout. The epitheliocystis agents Candidatus Piscichlamydia salmonis and Candidatus Clavichlamydia salmonicola could be identified in both catchments, although their relative proportions differed from site to site. Additionally, in two rivers in the Rhine catchment, a new species of Candidatus Similichlamydia was identified. Based on the histology, infection intensity, and severity of pathological changes were significantly more pronounced in mixed chlamydial infections, whereas single infections showed only low numbers of cysts and mild pathology. Infections could be found over a wide range of temperatures, which showed no correlation to infection prevalence or intensity.

No MeSH data available.


Related in: MedlinePlus