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The occurrence of Austrodiplostomum compactum (Lutz, 1928) (Digenea: Diplostomidae) metacercariae in the eyes of loricariid fish (Siluriformes: Osteichthyes: Loricariidae) from Brazil

Published online by Cambridge University Press:  12 May 2010

E.O.P. Zica ,
H. Brandão ,
C.H. Zawadzki ,
A.B. Nobile ,
E.D. Carvalho  and
R.J. da Silva
E.O.P. Zica
Affiliation:
Zoology Postgraduate Course, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo State, Brazil
H. Brandão
Affiliation:
Zoology Postgraduate Course, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo State, Brazil
C.H. Zawadzki
Affiliation:
Departament of Biology, Centro de Ciências Biológicas, Universidade Estadual de Maringá, Paraná State, Brazil
A.B. Nobile
Affiliation:
Zoology Postgraduate Course, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo State, Brazil
E.D. Carvalho
Affiliation:
Department of Morphology, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
R.J. da Silva*
Affiliation:
Department of Parasitology, Instituto de Biociências, Universidade Estadual Paulista, Botucatu, São Paulo, Brazil
*
* E-mail: reinaldo@ibb.unesp.br
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Abstract

The aim of this study was to report the occurrence of Austrodiplostomum compactum metacercariae in the eyes of 98 specimens of loricariid fish (Hypostomus ancistroides, H. hermanni, H. iheringii, H. margaritifer, H. regani, H. strigaticeps, Hypostomus sp. and Megalancistrus parananus) from the Chavantes reservoir (23°07′36″S and 49°37′35″W) located in the rio Paranapanema, upper Paraná river basin, municipality of Ipaussu, São Paulo State, Brazil. Fish were collected from October 2007 to February 2009 using nylon monofilament gill nets and transported to the field laboratory where they were euthanized and the eyes were taken and examined under a stereomicroscope. Hypostomus ancistroides and M. parananus were not infected by this diplostomid. Hypostomus hermanni and H. margaritifer were represented by only one specimen but both had a high intensity of A. compactum metacercarie (27 and 35, respectively). Hypostomus strigaticeps (n = 45) and H. iheringii (n = 28) were the most representative specimens and the prevalence, mean intensity of infection and mean abundance were 24.4%, 10.3 and 2.7, and 64.2%, 13.1 and 8.4, respectively. No correlation was observed between the intensity of infection and the standard length (r = − 0.223; P = 0.827) and weight (r = 0.03; P = 0.779) of studied fish. Similarly, linear regression among these variables showed a poor correlation and indicated that the infection by A. compactum metacercariae occurs similarly in small and large fish specimens. A seasonal pattern of infection was not observed. Hypostomus hermanni, H. iheringii, H. margaritifer and H. strigaticeps were new hosts recorded for A. compactum metacercariae. A review of morphometric data of A. compactum metacercariae is presented.

Type
Research Papers
Information
Journal of Helminthology , Volume 85 , Issue 1 , March 2011 , pp. 73 - 79
Copyright
Copyright © Cambridge University Press 2010

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