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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

(A) Box plot of number of cysts per gill arch in Rhine and Rhone catchment. (B) Number of cysts per gill arch in tributaries (Aare, Limmat, and Rhine belonging to the Rhine catchment; Rhone belonging to the Rhone catchment) (note the logarithmic scale in the y axis).
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Figure 3: (A) Box plot of number of cysts per gill arch in Rhine and Rhone catchment. (B) Number of cysts per gill arch in tributaries (Aare, Limmat, and Rhine belonging to the Rhine catchment; Rhone belonging to the Rhone catchment) (note the logarithmic scale in the y axis).

Mentions: The infection intensity, as a measure of the number of cysts per gill arch, is also highly skewed toward small values (Figure 3, Table 1). Most of the infected fish (143 out of 165) had fewer than 50 cysts per gill arch. In the Rhine catchment, there are some outliers with up to 450 cysts per gill arch, mainly in the Rhine region (Figure 3). However, infection intensity showed no significant differences between the catchments or the tributaries (P = 0.2336; Kruskal-Wallis rank sum test).


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)

(A) Box plot of number of cysts per gill arch in Rhine and Rhone catchment. (B) Number of cysts per gill arch in tributaries (Aare, Limmat, and Rhine belonging to the Rhine catchment; Rhone belonging to the Rhone catchment) (note the logarithmic scale in the y axis).
© Copyright Policy
Related In: Results  -  Collection

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

Figure 3: (A) Box plot of number of cysts per gill arch in Rhine and Rhone catchment. (B) Number of cysts per gill arch in tributaries (Aare, Limmat, and Rhine belonging to the Rhine catchment; Rhone belonging to the Rhone catchment) (note the logarithmic scale in the y axis).
Mentions: The infection intensity, as a measure of the number of cysts per gill arch, is also highly skewed toward small values (Figure 3, Table 1). Most of the infected fish (143 out of 165) had fewer than 50 cysts per gill arch. In the Rhine catchment, there are some outliers with up to 450 cysts per gill arch, mainly in the Rhine region (Figure 3). However, infection intensity showed no significant differences between the catchments or the tributaries (P = 0.2336; Kruskal-Wallis rank sum test).

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