scholarly journals Early stages of Margaritifera margaritifera glochidiosis in Atlantic salmon: Morphopathological characterization

2019 ◽  
Vol 43 (1) ◽  
pp. 69-80
Author(s):  
Pedro A. Castrillo ◽  
Catuxa Varela‐Dopico ◽  
Paz Ondina ◽  
María Isabel Quiroga ◽  
Roberto Bermúdez
Keyword(s):  
Atlantic Salmon ◽  
Margaritifera Margaritifera ◽  
Early Stages

scholarly journals Higher mortality of the less suitable brown trout host compared to the principal Atlantic salmon host when infested with freshwater pearl mussel (Margaritifera margaritifera) glochidia

2021 ◽  
Author(s):  
Janhavi Marwaha ◽  
Per Johan Jakobsen ◽  
Sten Karlsson ◽  
Bjørn Mejdell Larsen ◽  
Sebastian Wacker
Keyword(s):  
Atlantic Salmon ◽  
Brown Trout ◽  
Host Species ◽  
Salmo Trutta ◽  
The Other ◽  
Margaritifera Margaritifera ◽  
Pearl Mussel ◽  
Suitable Host ◽  
Freshwater Pearl Mussel ◽  
Host Interaction

AbstractThe freshwater pearl mussel (Margaritifera margaritifera) is a highly host-specific parasite, with an obligate parasitic stage on salmonid fish. Atlantic salmon (Salmo salar) and brown trout (Salmo trutta f. trutta and Salmo trutta f. fario) are the only hosts in their European distribution. Some M. margaritifera populations exclusively infest either Atlantic salmon or brown trout, while others infest both hosts with one salmonid species typically being the principal host and the other a less suitable host. Glochidial abundance, prevalence and growth are often used as parameters to measure host suitability, with the most suitable host species displaying the highest parameters. However, it is not known if the degree of host specialisation will negatively influence host fitness (virulence) among different host species. In this study we examined the hypothesis that glochidial infestation would result in differential virulence in two salmonid host species and that lower virulence would be observed on the most suitable host. Atlantic salmon and brown trout were infested with glochidia from two M. margaritifera populations that use Atlantic salmon as their principal host, and the difference in host mortality among infested and control (sham infested) fish was examined. Higher mortality was observed in infested brown trout (the less suitable host) groups, compared to the other test groups. Genetic assignment was used to identify offspring from individual mother mussels. We found that glochidia from individual mothers can infest both the salmonid hosts; however, some mothers displayed a bias towards either salmon or trout. We believe that the differences in host-dependent virulence and the host bias displayed by individual mothers were a result of genotype × genotype interactions between the glochidia and their hosts, indicating that there is an underlying genetic component for this parasite-host interaction.

Effects of (Margaritifera margaritifera) glochidial infection on performance of tank-reared Atlantic salmon (Salmo salar)

Aquaculture ◽  
2006 ◽  
Vol 256 (1-4) ◽  
pp. 74-79 ◽  
Author(s):  
James W. Treasurer ◽  
Lee C. Hastie ◽  
Dougie Hunter ◽  
Fiona Duncan ◽  
Claire M. Treasurer
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Margaritifera Margaritifera ◽  
Atlantic Salmon Salmo Salar

Glochidium morphology of the freshwater pearl mussel (Margaritifera margaritifera) and glochidiosis of Atlantic salmon (Salmo salar): a study by scanning electron microscopy

1994 ◽  
Vol 72 (1) ◽  
pp. 15-21 ◽  
Author(s):  
L. P. Nezlin ◽  
R. A. Cunjak ◽  
A. A. Zotin ◽  
V. V. Ziuganov
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Atlantic Salmon ◽  
Salmo Salar ◽  
Cyst Formation ◽  
Margaritifera Margaritifera ◽  
Pearl Mussel ◽  
Freshwater Pearl Mussel ◽  
Atlantic Salmon Salmo Salar ◽  
Scanning Electron

The morphology of glochidia of the freshwater pearl mussel Margaritifera margaritifera L. and the development of the cyst for 50 days after glochidial infection of wild and hatchery-reared Atlantic salmon (Salmo salar L.) parr were studied using scanning electron microscopy. The microvillar surface of the inner epithelium of the glochidium, which may function in nutrition, respiration, and osmoregulation, is described. Glochidia were found to have five sensory tufts as well as marginal ciliary bands which are believed to function in directing water currents. After artificial infection of salmon parr, cyst formation was the result of shape change and migration of gill epithelial cells, but not hyperplasia. The process of cyst formation lasted from 9 to 12 h. No mortality of salmon parr occurred during the experiment. Based on our study, glochidia appear to have a negligible effect on the gills of Atlantic salmon, its preferred fish host. These results are discussed in the context of the possibility of a mutually beneficial coexistence of Atlantic salmon and pearl mussels in northern European rivers such as the Varzuga River in Russia.

Morphopathology and gill recovery of Atlantic salmon during the parasitic detachment of Margaritifera margaritifera

2021 ◽  
Author(s):  
Pedro A. Castrillo ◽  
Catuxa Varela‐Dopico ◽  
Roberto Bermúdez ◽  
Paz Ondina ◽  
María Isabel Quiroga
Keyword(s):  
Atlantic Salmon ◽  
Margaritifera Margaritifera
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