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Título
Prevalence of serum antibodies against Saprolegnia parasitica in wild and farmed brown trout Salmo trutta
Autor
Facultad/Centro
Área de conocimiento
Datos de la obra
Diseases of aquatic organisms, 2009, vol. 83, n. 1
Editor
Inter-Research
Fecha
2009-01-28
Abstract
The prevalence of serum antibodies against Saprolegnia parasitica in wild and farmed
brown trout Salmo trutta from the province of León (NW Spain) was studied by enzyme-linked
immunosorbent assay (ELISA). Blood samples from healthy and Saprolegnia-infected brown trout
were collected over 2 yr with a seasonal periodicity (January, April, July and October) from a hatchery
and river with frequent presence of saprolegniosis (River Porma) and from a river in which the
disease was rarely observed (River Omaña). The individual prevalence was 30.1%, but statistically
significant differences were observed between the prevalence in trout from the hatchery (43.0%),
from River Porma (31.8%) and from River Omaña (6.4%) and also between the prevalence observed
in October (42.9%) and the values obtained in January (24.8%), April (22.7%) and July (27.5%).
There was no difference between the seroprevalence in females (34.8%) and males (38.2%), but a
positive correlation between raised serum antibody levels and larger (older) fish was found. The low
prevalence of antibodies observed in Saprolegnia-infected trout (18.0%) suggests possible immune
suppression and the lack of an effective specific immune response in fish with saprolegniosis.
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DAO 83, 17-22, 2009 (Prevalence of antibodies against S. parasitica)