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Infection levels of proteocephalidean cestodes in Cichla piquiti (Osteichthyes: Cichlidae) of the Volta Grande Reservoir, Minas Gerais, Brazil, relative to host body weight and gender

Published online by Cambridge University Press:  06 January 2011

M.L. Martins ,
J. Pereira Jr ,
A. de Chambrier  and
J.L.P. Mouriño
M.L. Martins*
Affiliation:
AQUOS – Laboratory of Aquatic Organisms Health, Aquaculture Department, Federal University of Santa Catarina-UFSC, Rod. SC 404, km 3, 88040-900, Florianópolis, SC, Brazil
J. Pereira Jr
Affiliation:
Laboratory of Aquatic Organisms Parasitology, ICB, Federal University of Rio Grande – FURG, 96650-900, Rio Grande, RS, Brazil
A. de Chambrier
Affiliation:
Department of Invertebrates, Natural History Museum Geneva, PO Box 6434, 1211Geneva 6, Switzerland
J.L.P. Mouriño
Affiliation:
Laboratory of Marine Shrimp, UFSC, Rua Beco dos Coroas s/n, 88062-601, Barra da Lagoa, Florianópolis, SC, Brazil
*
*Fax: +55 48 33343441 E-mail: [email protected]
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Abstract

We evaluated the relationship between infection by proteocephalid cestodes and the sex and weight classes of tucunaré (Cichla piquiti) captured between August 1999 and June 2001 in the Volta Grande Reservoir, Minas Gerais, Brazil. A total of 96 fish, 75.9 ± 9.3% males and 88.9 ± 6.4% females, were parasitized by Proteocephalus macrophallus and P. microscopicus, with total mean intensities of 76.6 ± 23.9 and 145.2 ± 36.7, respectively, during this period. In the majority of the months analysed, males showed 71.4–100% prevalence of parasitism and females 80–100%. Although there was no significant difference, females showed a higher mean intensity of infection (145.2 ± 36.7) than males (76.6 ± 23.9). Fish weighing 300–800 g showed a higher mean abundance of parasites (P < 0.05) compared with the biggest specimens weighing 801–2750 g. Analysing both males and females together, the greatest mean intensities of infection were found in October and December (P < 0.05) independent of the year, which coincides with the months of highest rainfall. These results show that fish living in reservoirs may be more susceptible to intermediate hosts than those that live in rivers.

Type
Research Papers
Information
Journal of Helminthology , Volume 85 , Issue 4 , December 2011 , pp. 462 - 467
Copyright
Copyright © Cambridge University Press 2011

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