PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

ABSTRACT.- Rocha T.L., Santos A.P.R. & Sabóia-Morais S.M.T. 2013. [Pseudo-gill of guppy, Poecilia reticulata (Peter, 1859): structural, morphometric, and histochemical analyses for the detection of glycoconjugates.] Pseudobrânquia do guaru Poecilia reticulata (Peter, 1859): análise estrutural, morfométrica e histoquímica para detecção de glicoconjugados. Pesquisa Veterinária Brasileira 33(5):669-673. Laboratório de Comportamento Celular, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus II, ICB IV, Cx. Postal 131, Goiânia, GO 74001-970, Brazil. E-mail: simonesaboias@gmail.com The morphology, cytomorphometric parameters, and glycoconjugates present in the pseudo-gill of guppy, Poecilia reticulata Peter, 1859 (Cyprinodontiformes: Poeciliidae), were investigated by light microscopy coupled to image capture and analysis system, and also by lectin histochemistry. The microscopic anatomy indicates that P. reticulata has a glandular pseudo-gill formed by two lobes, located underneath the pharynx epithelium. The organ is formed by vascularized parenchyma rich in pseudo-gill cells. This cell type exhibits active cytophysiological state with an abundant system of biomembranes and lacking of ostium in apical surface, which in turn is found in the mitochondria-rich cells of the holobranch. This indicates that the pseudo-gill cells distinguishe from the holobranch cells in their morphology, histochemistry and physiology. Due to these intrinsic characteristics, the pseudo-gill of guppy fingerlings may have non-respiratory function in the initial phase of their development. The characterization of guppy’s pseudo-gill could facilitate further studies about the effect of water pollutants on biomonitor species, such as P. reticulata.

• Poecilia reticulata gills brânquias

Abstract in Portuguese:

RESUMO.- Rocha T.L., Santos A.P.R. & Sabóia-Morais S.M.T. 2013. [Pseudo-gill of guppy, Poecilia reticulata (Peter, 1859): structural, morphometric, and histochemical analyses for the detection of glycoconjugates.] Pseudobrânquia do guaru Poecilia reticulata (Peter, 1859): análise estrutural, morfométrica e histoquímica para detecção de glicoconjugados. Pesquisa Veterinária Brasileira 33(5):669-673. Laboratório de Comportamento Celular, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus II, ICB IV, Cx. Postal 131, Goiânia, GO 74001-970, Brazil. E-mail: simonesaboias@gmail.com A morfologia, os parâmetros citomorfométricos e os glicoconjugados presentes na pseudobrânquia de guaru, Poecilia reticulata Peter, 1859 (Cyprinodontiformes: Poeciliidae), foram investigados por microscopia de luz acoplada ao sistema de captura e análise de imagens, juntamente por histoquímica com lectinas. A anatomia microscópica indicou que P. reticulata possui pseudobrânquia glandular formada por dois lóbulos, a qual se localiza abaixo do epitélio faringiano. O órgão é constituído por parênquima vascularizado e rico em células pseudobranquiais. Esse tipo celular exibe estado citofisiológico ativo, com abundante sistema de biomembranas e ausência de óstio na superfície apical,que por sua vez é encontrado nas células ricas em mitocôndrias das holobrânquias. Assim, indica-se que as células da pseudobrânquia se distinguem das células das holobrânquias em relação à morfologia, histoquímica e fisiologia. Em decorrência dessas características intrínsecas, a pseudobrânquia de alevinos do guaru pode desempenhar funções não respiratórias nas fases iniciais do desenvolvimento. Além disso, a caracterização da pseudobrânquia do guaru possibilitará estudos futuros sobre o efeito de poluentes aquáticos em espécies biomonitoras, como P. reticulata.

Abstract in English:

ABSTRACT.- Rocha T.L.,Yamada A.T., Mazaro e Costa R. & Sabóia-Morais S.M.T. 2011. [Analyses of the development and glycoproteins present in the ovarian follicles of Poecilia vivipara (Cyprinodontiformes, Poeciliidae).] Análise do desenvolvimento e das glicoproteínas presentes nos folículos ovarianos de Poecilia vivipara (Cyprinodontiformes, Poeciliidae). Pesquisa Veterinária Brasileira 31(1):87-93. Laboratório de Comportamento Celular, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus II, ICB IV, Cx. Postal 131, Goiânia, GO 74001-970, Brazil. E-mail: simonesaboias@gmail.com The morphofunctional aspects of oogenesis of Poecilia vivipara were studied aiming to understand the reproductive biology and development of species with internal fertilization, particularly those belonging to the family Poeciliidae. The stages of gonadal maturation and follicular development were characterized using mesoscopic, histological, histochemical, and lectin cytochemical analyses. Through mesoscopic evaluation the ovarian development was classified in six phases of development: immature, in maturation I, in maturation II, mature I, mature II, and post-spawn. Based on microscopic examination of the ovaries, we identified the presence of oocytes types I and II during the previtellogenic phase and types III, IV, and V during the vitellogenic phase. As oogenesis proceeded the oocyte cytosol increased in volume and presented increased cytoplasmic granule accumulation, characterizing vitellogenesis. The zona radiata (ZR) increased in thickness and complexity, and the follicular epithelium, which was initially thin and consisting of pavimentous cells, in type III oocytes exhibited cubic simple cells. The histochemical and cytochemical analyses revealed alterations in the composition of the molecular structures that form the ovarian follicle throughout the gonadal development. Our study demonstrated differences in the female reproductive system among fish species with internal and external fertilization and we suggest P. vivipara can be used as experimental model to test environmental toxicity.

• Ovarian follicles Poecilia vivipara Cyprinodontiformes Poeciliidae folículos ovarianos

Abstract in Portuguese:

RESUMO.- Rocha T.L.,Yamada A.T., Mazaro e Costa R. & Sabóia-Morais S.M.T. 2011. [Analyses of the development and glycoproteins present in the ovarian follicles of Poecilia vivipara (Cyprinodontiformes, Poeciliidae).] Análise do desenvolvimento e das glicoproteínas presentes nos folículos ovarianos de Poecilia vivipara (Cyprinodontiformes, Poeciliidae). Pesquisa Veterinária Brasileira 31(1):87-93. Laboratório de Comportamento Celular, Departamento de Morfologia, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus II, ICB IV, Cx. Postal 131, Goiânia, GO 74001-970, Brazil. E-mail: simonesaboias@gmail.com