scholarly journals Persistence of Tetracapsuloides bryosalmonae (Myxozoa) in chronically infected brown trout Salmo trutta

2014 ◽  
Vol 111 (1) ◽  
pp. 41-49 ◽  
Author(s):  
A Abd Elfattah ◽  
G Kumar ◽  
H Soliman ◽  
M El Matbouli
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta ◽  
Tetracapsuloides Bryosalmonae

Sporogony of Tetracapsuloides bryosalmonae in the brown trout Salmo trutta and the role of the tertiary cell during the vertebrate phase of myxozoan life cycles

Parasitology ◽  
2008 ◽  
Vol 135 (9) ◽  
pp. 1075-1092 ◽  
Author(s):  
D. J. MORRIS ◽  
A. ADAMS
Keyword(s):  
Brown Trout ◽  
Salmo Trutta ◽  
Cell Formation ◽  
Life Cycles ◽  
Single Spore ◽  
Large Numbers ◽  
Brown Trout Salmo Trutta ◽  
A Cell ◽  
Tetracapsuloides Bryosalmonae ◽  
Cell Engulfment

SUMMARYTetracapsuloides bryosalmonae is the myxozoan that causes the commercially and ecologically important proliferative kidney disease of salmonid fish species. Immunohistochemistry and electron microscopy were used to examine the development of this parasite within the kidney of the brown trout Salmo trutta. The main replicative phase of T. bryosalmonae is a cell doublet composed of a primary cell and a single secondary cell. Engulfment of one secondary cell by another to form a secondary-tertiary doublet (S-T doublet) heralded the onset of sporogony whereupon the parasite migrated to the kidney tubule lumen. Within the tubule, the parasite transformed into a pseudoplasmodium and anchored to the tubule epithelial cells via pseudopodial extensions. Within each pseudoplasmodium developed a single spore, composed of 4 valve cells, 2 polar capsules and 1 sporoplasm. The pseudoplasmodia formed clusters suggesting that large numbers of spores develop within the fish. This examination of T. bryosalmonae suggests that the main replicative phase of freshwater myxozoans within vertebrates is via direct replication of cell doublets rather than through the rupturing of extrasporogonic stages, while tertiary cell formation relates only to sporogony. Taken in conjunction with existing phylogenetic data, 5 distinct sporogonial sequences are identified for the Myxozoa.

scholarly journals Proliferative Kidney Disease and Proliferative Darkening Syndrome are Linked with Brown Trout (Salmo trutta fario) Mortalities in the Pre-Alpine Isar River

Pathogens ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 177 ◽  
Author(s):  
Arndt ◽  
Fux ◽  
Blutke ◽  
Schwaiger ◽  
El-Matbouli ◽  
...  
Keyword(s):  
Kidney Disease ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Renal Tissue ◽  
Contributing Factors ◽  
Proliferative Kidney Disease ◽  
The North ◽  
Brown Trout Salmo Trutta ◽  
Tetracapsuloides Bryosalmonae ◽  
Salmo Trutta Fario

For many years, brown trout (Salmo trutta fario) mortalities within the pre-alpine Isar River in Germany were reported by the Bavarian Fisheries Association (Landesfischereiverband Bayern e.V.) and local recreational anglers during August and September. Moribund fish seemed to be affected by proliferative darkening syndrome (PDS). In addition, proliferative kidney disease (PKD) caused by Tetracapsuloides bryosalmonae was discussed. To investigate this phenomenon, the present field study monitored brown trout mortalities by daily river inspection in 2017 and 2018. Moribund brown trout (n = 31) were collected and examined using histology, immunohistochemistry, qPCR, and quantitative stereology. Our investigations identified 29 (93.5%) brown trout affected by PKD. Four brown trout (12.9%) displayed combined hepatic and splenic lesions fitting the pathology of PDS. The piscine orthoreovirus 3, suspected as causative agent of PDS, was not detectable in any of the samples. Quantitative stereological analysis of the kidneys revealed a significant increase of the renal tissue volumes with interstitial inflammation and hematopoietic hyperplasia in PKD-affected fish as compared to healthy brown trout. The identified T. bryosalmonae strain was classified as part of the North American clade by phylogenetical analysis. This study highlights PKD and PDS as contributing factors to recurrent autumnal brown trout mortalities.

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