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Revista do Instituto de Medicina Tropical de São Paulo

On-line version ISSN 1678-9946

Rev. Inst. Med. trop. S. Paulo vol.52 no.4 São Paulo July/Aug. 2010

http://dx.doi.org/10.1590/S0036-46652010000400008 

PARASITOLOGY

 

Melanoides tuberculata (Mollusca: Thiaridae) as an intermediate host of Centrocestus formosanus (Trematoda: Heterophyidae) in Brazil

 

Melanoides tuberculata (Mollusca: Thiaridae) como hospedeiro intermediário de Centrocestus formosanus (Trematoda: Heterophyidae) no Brasil

 

 

Hudson Alves Pinto; Alan Lane de Melo

Laboratório de Taxonomia e Biologia de Invertebrados, Departamento de Parasitologia, Instituto de Ciências Biológicas, UFMG, Belo Horizonte, MG, Brasil

Correspondence to

 

 


SUMMARY

Pleurolophocercous cercariae emerged from naturally infected Melanoides tuberculata from Minas Gerais State, Brazil, were used to perform experimental infection of laboratory-reared Poecilia reticulata. Mature metacercariae were obtained from the gills of fishes and force-fed to Mus musculus. The adult parasites which recovered from small intestines of mice were identified as Centrocestus formosanus. This is the first report of M. tuberculata as intermediate host of this heterophyid in Brazil.

Keywords: Centrocestus formosanus; Melanoides tuberculata; Brazil; Experimental infection; Trematoda.


RESUMO

Cercárias do tipo pleurolofocerca emergidas de Melanoides tuberculata naturalmente infectados coletados na represa da Pampulha, Belo Horizonte, Minas Gerais, Brasil, foram utilizadas para a infecção experimental de Poecilia reticulata criados em laboratório. Metacercárias maduras foram obtidas nas brânquias dos peixes e administradas por via oral a Mus musculus. Parasitos adultos recuperados no intestino delgado dos camundongos foram identificados como Centrocestus formosanus. Este é o primeiro relato de M. tuberculata como hospedeiro intermediário deste parasito no Brasil.


 

 

Melanoides tuberculata (Müller, 1774), an exotic mollusc introduced in Brazil in the late 1960s40, has been found in several states in Brazil12. Despite some studies related to the interaction between M. tuberculata and planorbid molluscs which transmit Schistosoma mansoni Sambon, 1907 in the country13,14, the possible damage on the native fauna as alien species and their potential to act as parasite vector in the country have not yet been evaluated. In this later aspect, some studies had already reported the finding of M. tuberculata harboring pleurolophocercous cercariae in Brazil5,6,39, but these larvae, characterized as Pleurolophocercous type, still remain without a specific identification.

In the present study, malacological surveys were performed at Pampulha dam (an artificial lake located between 430 58' and 440 01'W and 190 50' and 190 52'S, in the northern region of the city of Belo Horizonte and 2 km away from the campus of "Universidade Federal de Minas Gerais") from March 2006 to July 2009. Molluscs were collected with a scoop net and long forceps. After a preliminary trial, molluscs were placed in a thermal box, labeled and shipped to the laboratory. Then they were placed individually in plastic recipients containing 5 mL of tap water and left overnight at room temperature. Thiarids were examined with a stereomicroscope before and after artificial photostimulation for two hours. Emerged larvae were collected with micropipette, transferred to glass slides and analyzed with vital stains (0.05% neutral red, 0.05% toluidine blue, 0.05% alizarin red) or fixed and then stained with acetic carmine and mounted in Canada balsam23.

Cercariae were concentrated by filtration using a Buchner funnel31 and one hundred larvae in 5 mL were used for individual infection of 30 adult specimens (2-3 cm of length) of laboratory reared Poecilia reticulata Peters, 1859 (Pisces: Poeciliidae). Thirty days after infection the surviving fishes were necropsied in order to recover metacercariae. Cysts obtained from gills of experimentally infected fish were administered per os to five mice of the AKR/J strain. Fifteen days after infection, mice were sacrificed by cervical dislocation according to the local animal experimentation ethics committee (CETEA/UFMG), and their intestines were thoroughly and longitudinally opened in Petri dishes containing 0.85% saline solution and adult parasites were recovered from the proximal third of the small intestine. Parasites were studied alive or then placed between the slide and the coverslip with slight pressure, fixed in cold 10% formalin, stained with acetic carmine, dehydrated, cleared in benchwood and mounted in Canada balsam.

Drawings were made using a camera lucida and specimens were measured with a millimitered eyepiece. Photographic documentation was performed in light microscope. The results were compared with taxonomical keys7 and morphological descriptions from several authors3,9,10,17,18,22,29. The specimens studied were deposited at the collection of Department of Parasitology (DPIC), UFMG.

From 3,834 specimens of M. tuberculata collected, 268 (7.0%) were naturally infected by larval trematodes preliminarily characterized as belonging to the group of Pleurolophocercous cercariae. These larvae encysted in P. reticulata and out of thirty fish experimentally infected, twenty survivors were analyzed, all of them presenting viable metacercariae which were used for inoculation of mice. Fifty ovigerous worms with 32 circumoral spines were obtained from the experimentally infected mice and identified as members of family Heterophyidae Leiper, 1909, subfamily Centrocestinae Looss, 1899 and the species Centrocestus formosanus (Nishigori, 1924) (Fig. 1). The morphology and morphometry of the developmental stages obtained are in accordance with the original description and with experimental studies conducted by different authors (Table 1). Measurements are presented by the mean followed by the range in parenthesis.

 

 

 

 

C. formosanus was described in 1924 from adult parasites recovered from natural and experimental definitive hosts in Taiwan29. The life cycle of this trematode was also studied in China, where M. tuberculata were recognized as the first intermediate hosts and fishes and frogs as second intermediate hosts9,10. The species was introduced in the New World in the late 1950s22, possibly by thiarids, migratory birds and/or exotic fishes naturally infected.

Among fish, several species of different families have already been reported as naturally and experimentally infected in many countries. The development of metacercariae on gills causes pathological changes which, in some cases, as high parasite burden, may cause the death of these hosts and damage in aquaculture2,15,24,25,26,28,30,35,36,42.

Adult parasites, in turn, have already been reported naturally in fish-eating birds (Butorides striatus (Linnaeus, 1758); Bubulcus ibis coromandus (Boddaert, 1783) and Nycticorax nycticorax (Linnaeus, 1758)), and mammals, including human beings9,11,19,20,21,28,29,32,44.

Several experimental models, among birds (chickens, ducks, pigeons) and mammals (dogs, cats, Rhesus monkeys, mice, hamsters, rats and rabbits), were found to be susceptible to infection with the trematode in several parts of the world3,9,18,22,27,28,34,38, being considered a parasite with low intraspecific variability among different hosts and places36.

In the American continent there are some published reports of the parasite in the USA22,24,25,26, Mexico1,3,36, Venezuela18, Colombia41,43. Recently the occurrence of C. formosanus in Poecilia vivipara (Bloch & Schneider, 1801), from Rio de Janeiro, Brazil was reported in a congress communication37. However, until the present study the intermediate host of this heterophid was unknown in this country.

In Minas Gerais State, M. tuberculata was introduced in the 1980's8 reaching a high population density one decade after the first report4 and today is considered to be a well established population. Due to the existence of several species of piscivorous birds, resident and visiting ones33, as well as a rich ichthyofauna16, the Pampulha dam has become an appropriate environment to maintain the life cycle of C. formosanus.

The control strategy against the spread of this trematode and the intermediate host, M. tuberculata, need to be implemented to prevent the spread of human and veterinary cases of this parasite in Brazil. This is the first report of C. formosanus in M. tuberculata from Brazil and of this Heterophyidae in the state of Minas Gerais.

 

ACKNOWLEGMENTS

To Mr. Airton Lobo for technical assistance and to the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for financial support and scholarship to H.A.P.

 

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Correspondence to:
Dr. Alan Lane de Melo
Laboratório de Taxonomia e Biologia de Invertebrados
Departamento de Parasitologia, Instituto de Ciências Biológicas/UFMG
C.P. 486, 30123-970 Belo Horizonte, Minas Gerais
Brasil. E-mail: aldemelo@icb.ufmg.br

Received: 22 February 2010
Accepted: 1 June 2010

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