Occurrence of Henneguya sp. (Thelohan, 1892) in the blood of Astyanax fasciatus (Cuvier, 1819) in a stream of the Muriae River basin in Itaperuna, RJ.
Among myxosporeans, the genus Henneguya Thelohan, 1892 is the most abundant in South America, with 29 known species. The importance of this genus as a pathogen of freshwater fish has been described by several authors (Dykova e Lom 1978, Kalavati e Narasimhamurti 1985, Lom e Dykova 1995, Martins e Souza 1997, Martins et al. 1999a). Among freshwater fish, the genus Astyanax (Baird e Girard, 1854) is frequently related to myxosporeans, with ten species of Henneguya commented or described so far (Cordeiro et al. 1983, Gioia et al. 1986, Gioia e Cordeiro 1987, Barassa et al. 2003, Vita et al. 2003). The hosts of the genus Astyanax (Baird e Girard, 1854) contains approximately 100 species and subspecies that are widely distributed throughout South and Central America (Garutti e Britski 1997). These small size fish, popularly known as lambari in Brazil, occupy a fundamental position in the food chain of aquatic ecosystems, where they serve as food for several predators (Esteves 1996) tornando-se um hospedeiro intermediario para diversos predadoers There are no records of scientific studies about occurrence of Henneguya sp. in the blood of fishes. The objective of this study was report the occurrence of Hemmeguya sp. In blood of Astyanax fasciatus.
2--Material and Methods
This study were performed in Itaperuna in the Northwest of the Rio de Janeiro state, in a stream located in the left margin of the Muriae River, that belongs to the basin of the Paraiba do Sul River. To the colects of the specimens were used ten fishing nets of 10m of length and 1,5m of heigth, with meshes of 30mm of opposites knots. To the blood colect were perfomed the intra heart puncture using 5ml syringe.
3--Results and Discussions
Eight colects were perfomed between october 2009 and september 2010 with 45 days of interval, in each colect were captured ten specimen of Astyanax fasciatus giving a total of 80 slides of blood. This study reports the presence of Henneguya sp. in two specimens collected in november 2009. The spores found have eloganted spindle-shape with bifurcated caudal appendages. Two polar capsules were observed on the anterior extremity. The present description confirms that the parasite found belongs to the genus Henneguya. Myxozoan parasites are normally present in wild and captive fish. They do not cause any problem to their hosts when there is equilibrium between fish and environment. When any kind of stress to the host occurs, such as handling, poor water quality or overpopulation the parasites appear and several kinds of diseases arise (LOM and NOBLE, 1984). According Eiras (2002), the genus Henneguya has already been registered in various organs of lambari, though the gill filaments are the sites with the highest tropism, so has the highest prevalence, but there is no register in the literature of parasites from this genus in the blood of fishes, what permits comprehend the low incidence of parasites in this study.
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Pedro Henrique G. CAETANO (1), Alvaro DUTRA (2) & Marcos Paulo M. THOME (3) *
(1) Faculdade Redentor, Graduado Curso de ciencias biologicas, Rio de Janeiro, Brasil.
(2) Faculdade Redentor, Prof. Curso de Ciencias Biologicas, Rio de Janeiro, Brasil.
(2) Faculdade Redentor, Coordenadoria do Curso de Ciencias Biologicas, Rio de Janeiro, Brasil.
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|Author:||Caetano, Pedro Henrique G.; Alvaro, Dutra; Thome, Marcos Paulo M.|
|Publication:||Acta Biomedica Brasiliensia|
|Article Type:||Author abstract|
|Date:||Dec 1, 2012|
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