Nematodes in Hoplerytrinus unitaeniatus, Hoplias malabaricus and Pygocentrus nattereri (pisces characiformes) in Marajó Island, Brazil

Raimundo Nonato Moraes Benigno,Sérgio Carmona De São Clemente,Marcelo Knoff,Delir Corrêa Gomes,Roberto Magalhães Pinto,Edilson Rodrigues Matos

doi:10.1590/s1984-29612012000200018

Raimundo Nonato Moraes Benigno, Sérgio Carmona De São Clemente + Show 4 more

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https://doi.org/10.1590/s1984-29612012000200018

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Abstract

The aim of this study was to evaluate the tegument, musculature and mesentery of 102 specimens of Hoplerytrinus unitaeniatus, 104 of Hoplias malabaricus and 101 of Pygocentrus nattereri, from Arari Lake, Marajó Island, State of Pará, Brazil. Were identified the nematodes Contracaecum sp., Eustrongylides sp. and Procamallanus sp. Contracaecum sp. was the most prevalent, with rates of 84.31% (H. unitaeniatus), 95.19% (H. malabaricus), and 89.11% (P. nattereri). The highest prevalences of Eustrongylides sp. occurred in H. unitaeniatus (56.86%) and H. malabaricus (53.84%). Procamallanus sp. was only collected in the mesentery. Specimens of Eustrongylides sp. collected from the musculature were 91.9% of its population. Among the nematodes found in the mesentery, 98.34% were Contracaecum sp. with a mean intensity (MI) of 7.92 ± 8.11 (H. unitaeniatus), 8.49 ± 8.34 (H. malabaricus) and 7 ± 6.40 (P. nattereri). Contracaecum sp. presented the highest MI (8.49 ± 8.34) and mean abundance (8.09 ± 8.34). The highest MI values were observed in the mesentery. Eustrongylides sp. presented MI of 2.65 ± 3.21 (H. unitaeniatus), 3.41 ± 3.27 (H. malabaricus) and 2.17 ± 1.18 (P. nattereri). Nematodes with zoonotic potential that were found with high prevalence, shows the importance of actions by the health authorities.

Highlights

Raimundo Nonato Moraes Benigno1*; Sérgio Carmona de São Clemente2; Edilson Rodrigues Matos3; Roberto Magalhães Pinto4; Delir Corrêa Gomes4; Marcelo Knoff4
Human cases of parasitism by helminths due to consumption of fish processed under these conditions have been reported in Brazil and are associated with the species Ascocotyle (Phagicola) longa (Ransom, 1920) (CHIEFFI et al, 1990, 1992; ALMEIDA-DIAS; WOICIECHOVSKI, 1994), Diphyllobothrium latum (Linnaeus, 1758) (EDUARDO et al, 2005a, b; SANTOS; FARO, 2005; TAVARES et al, 2005; EMMEL et al 2006; LACERDA et al, 2007; CAPUANO et al, 2007; LLAGUNO et al, 2008), Clonorchis sinensis (Cobbold, 1875) (LEITE et al, 1989; DIAS et al, 1992) and Gnathostoma sp. (DANI et al, 2009)
Contracaecum larvae mostly occur in the visceral organs and mesentery of fish, limiting their zoonotic threat, which may explain why human cases are rare even considering that mammals are susceptible to experimental infection with these larvae (VIDAL-MARTINEZ et al 1994; BARROS et al, 2004)

Summary

Introduction

Raimundo Nonato Moraes Benigno1*; Sérgio Carmona de São Clemente2; Edilson Rodrigues Matos3; Roberto Magalhães Pinto4; Delir Corrêa Gomes4; Marcelo Knoff4. The aim of this study was to evaluate the tegument, musculature and mesentery of 102 specimens of Hoplerytrinus unitaeniatus, 104 of Hoplias malabaricus and 101 of Pygocentrus nattereri, from Arari Lake, Marajó Island, State of Pará, Brazil.

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