Navegando por Autor "VIDEIRA, Marcela Nunes"

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Acesso aberto (Open Access)
An anatomopathological study of hepatic coccidiosis (Calyptospora sp.) in the Acará-pixuna, Aequidens plagiozonatus Kullander, 1984 from the Brazilian state of Pará
(2013-02) VIDEIRA, Marcela Nunes; SILVA, Michele Velasco Oliveira da; TORTELLY, Rogério; MENEZES, Rodrigo Caldas; SÃO CLEMENTE, Sérgio Carmona de; MATOS, Edilson Rodrigues
The present study focuses on the anatomopathological alterations provoked by parasitism by Calyptospora sp. in 40 specimens of Aequidens plagiozonatus collected in Pará, Brazil. Examinations of the fresh material by compression of the hepatopancreas and histological sections showed immature forms and oocysts characteristic of the genus Calyptospora, in addition to a large quantity of melanomacrophagic centers spread throughout the organ. No significant inflammation of the hepatic tissue was observed. The melanomacrophagic centers and the compression of the hepatocytes are part of the response of the host to the parasite. This study represents the first record of parasitism by Calyptospora in A. plagiozonatus.
Acesso aberto (Open Access)
Estudo morfológico de microparasitas em Aequidens plagiozonatus Kullander 1984 (Osteiththyes: Cichlidae)
(Universidade Federal do Pará, 2010-12-22) VIDEIRA, Marcela Nunes; MATOS, Edilson Rodrigues; http://lattes.cnpq.br/7895814591867510
The ornamental fish market has been growing gradually in recent years and the increasing pressure on the banks of natural fishery resources, seeks to find alternatives to the continued production of fish through aquaculture or is the search for new features or even slightly, such as fish Aequidens plagiozonatus, common name cará pixuna. Based on this knowledge is important to perform studies characterizing the parasitological profile of these species of fish in order to verify and control the spread of parasites that cause imbalance in aquatic ecosystems. The objective this study was to provide a better understanding the bioecology, through a survey of actions caused by parasitic microparasites (microsporídios, myxosporídios e coccidios) emphasizing the morphology of these organisms. For this, five collections were made, totaling 100 specimens, which were autopsied and having their organs. Parasitized organs were removed fragments, fixed and processed for light microscopy. Hepatosomatic index were calculated and the prevalence of the parasite specimens for each group of parasites analyzed, giving the enfaze microparasites. From the observations made were 3 phyla were found: Myxozoa, Microsporidia and Apicomplexa. We observed the first occurrence of mixosporidiose urinary bladder of this species. We also observed the occurrence of multiparasitism and the multifocal localization of some parasites. The prevalence of microsporidia in the studied was 100%, 18% myxosporeans, Apicomplexa 45%. These data represent an important contribution to the study sanitary fish A. plagiozonatus in the region, since any activity that involves the extraction of natural resources should be managed through planning and management measures to allow the equilibrium of ecosystems, promoting sustainable use of its resources and guaranteeing the preservation of the system, so that it can prevent the spread and transfer of disease by means of aquatic animals. Keywords: Fish, Ictioparasitology, Aequidens plagiozonatus, microparasites.
Acesso aberto (Open Access)
Gobioides broussonnetii (Gobiidae): a new host for Pterobothrium crassicolle (Trypanorhyncha) on Marajó Island, northern Brazil
(2013-09) VIDEIRA, Marcela Nunes; SILVA, Michele Velasco Oliveira da; DIAS, Lilian de Nazaré Santos; MATOS, Patrícia Santos; ALMEIDA, Henrique Diniz Ferreira de; COSTA, Marcondes Lima da; SÃO CLEMENTE, Sérgio Carmona de; MATOS, Edilson Rodrigues
In the present study, the cestoid Pterobothrium crassicolle Diesing, 1850 (Trypanorhyncha), was observed parasitizing specimens of the violet goby (Gobioides broussonnetii Lacepède, 1800) collected from the estuary of the Paracauarí River on Marajó Island in the north of the Brazilian state of Pará, between January 2009 and December 2010. Tissue samples were analyzed, which led to identification of blastocysts containing plerocercoid larvae. These larvae were processed for scanning electron microscopy. Sixty G. broussonnetii specimens were dissected, and P. crassicolle was found in 48 (80%) of them. The violet goby, G. broussonnetii, is a new host for P. crassicolle.
Acesso aberto (Open Access)
Hepatic steatosis associated with microsporidiosis in teleost fishes from Marajó Island, Brazil
(2014-09) VIDEIRA, Marcela Nunes; SILVA, Michele Velasco Oliveira da; MATOS, Patrícia Santos; SÃO CLEMENTE, Sérgio Carmona de; SANCHES, Osimar de Carvalho; SANTOS, Patrícia de Fátima Saco dos; MATOS, Edilson Rodrigues
A total of 40 specimens of the teleost fish Gobioides grahamae Palmer & Wheeler, 1955 were obtained from the municipality of Salvaterra on Marajó Island in the Brazilian state of Pará. Their livers were removed and processed for light microscopy. Overall, 90% of the specimens presented some degree of steatosis of the liver, which was invariably associated with the presence of Microsporidium sp. The present study confirms the occurrence of steatosis in G. grahamae associated with parasitic infections by Microsporidium. The findings indicate that the condition of otherwise healthy fishes in their natural environment may be affected negatively by parasites.
Acesso aberto (Open Access)
Infection by Henneguya sp. (Myxozoa) in the bone tissue of the gill filaments of the Amazonian catfish Hypophthalmus marginatus (Siluriformes)
(Universidade Federal do Pará, 2015-09) SILVA, Michele Velasco Oliveira da; VIDEIRA, Marcela Nunes; SINDEAUX NETO, José Ledamir; SANTOS, Patricia dos; SANCHES, Osimar de Carvalho; MATOS, Patrícia Santos
This study describes aspects of the infection caused by the myxosporean genus Henneguya, which forms cysts in the bony portion of the gill filaments of Hypophthalmusmarginatus. Specimens of this catfish were acquired dead from artisanal fishermen near the town of Cametá, state of Pará, northern Brazil, between July 2011 and May 2012. They were transported in refrigerated containers to the Carlos Azevedo Research Laboratory at the Federal Rural University of Amazonia, in Belém, where analyses were performed. After confirmation of parasitism by the genus Henneguya, observation were made using optical and differential interference contrast (DIC) microscopy. The histological technique of embedment in paraffin was used. Ziehl-Neelsen staining was applied to the histological sections. Necropsy analyses on specimens of H. marginatus showed that 80% of them (40/50) had cysts of whitish coloration inside the bony portion of the gill filaments, filled with Henneguya spores. The present study found inflammatory infiltrate in the vicinity of the cysts. Furthermore, the special Ziehl-Neelsen staining technique made it possible to mark the Henneguya sp. cysts in the bone tissue and in spore isolates in the gill tissue structure. The descriptions of these histopathological findings show that this parasite is very invasive and causes damage to its host tissues.