Freshwater pearl mussel (Margaritifera margaritifera) glochidiosis in wild and farmed salmonid stocks in Scotland

Samples of salmonids were taken from six Scottish rivers and examined for freshwater mussel (Margaritifera margaritifera (L.)) glochidiosis. The prevalence and magnitude of natural infections observed were comparable to those reported elsewhere. In most rivers, older fish seem to be less susceptible...

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Bibliographic Details
Published in:Hydrobiologia 2001-02, Vol.445 (1-3), p.109-119
Main Authors: HASTIE, Lee C, YOUNG, Mark R
Format: Article
Language:English
Subjects:
Animal aquaculture
Animal productions
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
British Isles, Scotland
Conservation, protection and management of environment and wildlife
Fundamental and applied biological sciences. Psychology
Margaritifera margaritifera
Mollusks
Parks, reserves, wildlife conservation. Endangered species: population survey and restocking
Pisciculture
Rivers
Salmon
Spawning
Spawning behavior
Vertebrate aquaculture
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Summary:Samples of salmonids were taken from six Scottish rivers and examined for freshwater mussel (Margaritifera margaritifera (L.)) glochidiosis. The prevalence and magnitude of natural infections observed were comparable to those reported elsewhere. In most rivers, older fish seem to be less susceptible than 0+ fish, possibly due to an acquired immunity resulting from previous exposures. Initial infection loads may be greater on older fish due to greater ventilation rates and/or gill surface areas. However, this host size effect appears to be transitory. In a stock of farmed 0+ salmon, an entire parasitic stage was monitored. This took up to 11 months and only 5-10% of the initially attached glochidia managed to metamorphose and excyst as juvenile mussels. There are apparent differences in host utilisation between salmon and trout in certain rivers. Some trout stocks appear to be under-utilised by M. margaritifera, possibly due to differences in behaviour and/or spawning site. 0+ salmon are the most important hosts in several rivers. However, there are a number of mussel populations located in small streams which have no salmon, and these are entirely trout-dependent. This may be important in terms of conservation, with regard to the recent collapse of migratory trout stocks in Scotland.[PUBLICATION ABSTRACT]
ISSN:0018-8158
1573-5117
DOI:10.1023/A:1017588222480