Comparative Susceptibility of Brown Trout and Rainbow Trout to Discocotyle sagittata (Monogenea)

The susceptibility of brown trout (Salmo trutta) and rainbow trout (Oncorhynchus mykiss) to the monogenean Discocotyle sagittata in the United Kingdom was assessed by experimental infection of naive fish. One month postinfection with 100 oncomiracidia/host, brown trout harbored significantly lower b...

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Bibliographic Details
Published in:The Journal of parasitology 2004-08, Vol.90 (4), p.900-901
Main Authors: Rubio-Godoy, M, Tinsley, R C
Format: Article
Language:English
Subjects:
Discocotyle sagittata
Freshwater
Monogenea
Oncorhynchus mykiss
Salmo trutta
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Summary:The susceptibility of brown trout (Salmo trutta) and rainbow trout (Oncorhynchus mykiss) to the monogenean Discocotyle sagittata in the United Kingdom was assessed by experimental infection of naive fish. One month postinfection with 100 oncomiracidia/host, brown trout harbored significantly lower burdens (27.7 worms/host plus or minus 4.13 SE) than rainbow trout (47.8 worms /host plus or minus 3.90; P = 0.002). This indicates that the consistently lower prevalence and intensity of D. sagittata recorded in naturally infected farmed fishes reflects differences in susceptibility to the parasite. The outcome may be related to the comparatively short-term association of this parasite with rainbow trout (introduced to Britain in the 1880s) compared with the established native host-parasite association.
ISSN:0022-3395
DOI:10.1043/0022-3395(2004)090<0900:CSOBTA>2.0.CO;2