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Risk factors associated with Enteromyxum scophthalmi (Myxozoa) infection in cultured turbot, Scophthalmus maximus (L.)

Published online by Cambridge University Press:  19 June 2006

M. I. QUIROGA ,
M. J. REDONDO ,
A. SITJÀ-BOBADILLA ,
O. PALENZUELA ,
A. RIAZA ,
A. MACÍAS ,
S. VÁZQUEZ ,
A. PEREZ ,
J. M. NIETO  and
P. ALVAREZ-PELLITERO
M. I. QUIROGA
Affiliation:
Departamento de Ciencias Clínicas Veterinarias, Universidad de Santiago, Campus Universitario, 27002 Lugo, Spain
M. J. REDONDO
Affiliation:
Instituto de Acuicultura Torre de la Sal (C.S.I.C.), Ribera de Cabanes, 12595 Castellón, Spain
A. SITJÀ-BOBADILLA
Affiliation:
Instituto de Acuicultura Torre de la Sal (C.S.I.C.), Ribera de Cabanes, 12595 Castellón, Spain
O. PALENZUELA
Affiliation:
Instituto de Acuicultura Torre de la Sal (C.S.I.C.), Ribera de Cabanes, 12595 Castellón, Spain
A. RIAZA
Affiliation:
Stolt Sea Farm S.A., Lira, Carnota
A. MACÍAS
Affiliation:
Stolt Sea Farm S.A., Lira, Carnota
S. VÁZQUEZ
Affiliation:
Departamento de Ciencias Clínicas Veterinarias, Universidad de Santiago, Campus Universitario, 27002 Lugo, Spain
A. PEREZ
Affiliation:
Center for Animal Diseases Modeling and Surveillance, University of California in Davis, 279 Cousteau Place, Suite 500, Davis, CA 95616, USA, and CONICET/INTA Balcarce, Grupo de Sanidad Animal, Ruta 226 km 73, (7620) Balcarce, Argentina
J. M. NIETO
Affiliation:
Departamento de Ciencias Clínicas Veterinarias, Universidad de Santiago, Campus Universitario, 27002 Lugo, Spain
P. ALVAREZ-PELLITERO
Affiliation:
Instituto de Acuicultura Torre de la Sal (C.S.I.C.), Ribera de Cabanes, 12595 Castellón, Spain
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Abstract

An epidemiological cohort study of Enteromyxum scophthalmi in cultured turbot was performed on a farm in North Western Spain. Four different ongrowing stocks (A, B, C, D) were monitored monthly until market size. Fish from stocks C and D were divided into 2 subgroups, receiving filtered (CF and DF) or unfiltered (CUF and DUF) water. The lack of water filtration was positively associated with infection prevalence, as all fish kept in filtered water remained uninfected. Parasite abundance varied seasonally (P<0·05) in stock B and subgroup CUF. Infection was also associated (P<0·05) with host weight, and the highest prevalences and intensities were detected in 101–200 g and 201–300 g fish. Distribution pattern of E. scophthalmi in subgroups CUF and DUF had a variance higher than the mean, indicating overdispersion. The minimum period necessary for the first detection of the parasite and for the appearance of disease symptoms and mortality, varied depending on the stock and introduction date, although a long pre-patent period was always observed. Several factors, such as host density, parasite recruitment and parasite-induced fish mortality can contribute to the observed distribution pattern. Risk factors found to be associated with E. scophthalmi infection, including water quality and accumulation of infective stages in the culture tanks, should be considered when designing control strategies to prevent the introduction and spread of infective stages in the facilities.

Keywords

epidemiologyMyxosporeaaquaculturefishenteromyxosis
Type
Research Article
Information
Parasitology , Volume 133 , Issue 4 , October 2006 , pp. 433 - 442
Copyright
© 2006 Cambridge University Press

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Footnotes

M. I. Q and M. J. R. contributed equally to this article, so they share first authorship.

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