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Registros recuperados: 33 | |
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Lacerda, Ana Carolina Figueiredo; UEM; Takemoto, Ricardo Massato; UEM; Lizama, Maria de los Angeles Perez; UEM; Pavanelli, Gilberto Cezar; UEM. |
O presente trabalho teve como objetivo o estudo de copépodes parasitos de fossas nasais de peixes da planície de inundação do alto Rio Paraná. As coletas foram realizadas em diversos pontos da planície nos meses de março, junho e setembro de 2004. Foram coletados 73 exemplares de peixes da ordem Characiformes, de quatro famílias distintas, pertencentes a cinco espécies: Acestrorhynchus lacustris, Prochilodus lineatus, Schizodon borellii, Serrasalmus maculatus e Serrasalmus marginatus. Dentre os 73 peixes examinados, 53 encontravam-se parasitados por copépodes de fossas nasais, variando de 1 a 146 parasitos por peixe. Os parasitos encontrados pertenciam a três espécies conhecidas: Gamidactylus jaraquensis Thatcher & Boeger, 1984; Gamispatulus... |
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Palavras-chave: 2.13.00.00-3 Parasitologia copépodes; Ergasilidae; Vaigamidae; Ictioparasitos; Characiformes; Paraná; Brasil 2.13.00.00-3 Parasitologia. |
Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/887 |
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Hoshino, Maria Danielle Figueiredo Guimarães; Universidade Federal do Amapá; Tavares-Dias, Marcos; Embrapa Amapá. |
The present study provides the first investigation on the ecological aspects of the parasites M. lippincottianusfrom the Amazonian basin, as well as the parasite-host relationship. 76 out of the examined fish (98.7%) were parasitized by at least one species of parasites. A total of 8,774 parasites were collected, being Ichthyophthirius multifiliis, Anacanthorus jegui, Dadayius pacupeva, Digenea gen. sp. (metacercariae), Procamallanus (Spirocamallanus) inopinatus, Procamallanus (Spirocamallanus) sp., Spinoxyuris oxydoras, Contracaecum sp. larvae, Dolops longicauda and Hirudinea gen. sp. Ichthyophthirius multifiliis was the dominant species, followed by A. jegui. Among the endoparasites, S. oxydoras and D. pacupeva were predominant. The mean diversity of... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazônia; Parasitos; Peixes Amazon; Characiformes; Metynnis lippincottianus; Parasites infracommunities Parasitologia. |
Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/19876 |
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Mazzoni,Rosana; Nery,Lívia Lourenço; Iglesias-Rios,Ricardo. |
No presente trabalho tivemos como objetivo descrever as variações espaço-temporais e ontogenéticas da dieta de Astyanax janeiroensis do Rio Ubatiba, um riacho costeiro da Serra do Mar. Analisamos o conteúdo gástrico de 540 exemplares capturados mensalmente, durante 12 meses, em seis localidades, sendo três com cobertura (localidade fechada) vegetal e três sem cobertura (localidade aberta). Verificamos que A. janeiroensis é uma espécie onívora, com dieta essencialmente baseada em itens autóctones, majoritariamente de origem vegetal. O coeficiente intestinal da espécie foi estimado em 0,74 (+ 1,2) que é um valor compatível com o hábito alimentar onívoro. Não foram registradas diferenças na dieta dos exemplares coletados durantes as estações seca e chuvosa.... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alimentação; Ontogenia; Characiformes; Omnivoro. |
Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000300005 |
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Santos,Alejandra Filippo Gonzalez Neves dos; Carrera,Pedro Ribeiro de Oliveira; Aronovich,Marcos; Santos,Luciano Neves dos. |
O presente trabalho foi baseado em dados pretéritos sobre a dieta natural do lambari-cachorro Oligosarcus hepsetus em um reservatório do Sudeste brasileiro, e com isso foi testada a preferência alimentar desse carnívoro, a partir de experimentos com microcosmos. Os experimentos foram realizados em aquários, em janeiro de 2011. Os predadores foram coletados em um tributário do Rio Paraíba do Sul, enquanto as presas: Tilápia rendalli e o lambari, Astyanax fasciatus, foram adquiridas em pisciculturas. Foi testada a preferência alimentar do lambari-cachorro quanto ao tamanho das presas e às espécies-presa e os resultados foram relacionados com a energia da presa. O lambari-cachorro predou tilápia de menores comprimentos (CT) e alturas do corpo (AC), ao passo... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characiformes; Rio Paraiba do Sul; Peixe nativo. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000200018 |
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Barla,María J; Vera,María S; O'Brien,Emma D. |
The Salado River is an important watercourse in northern Pampean region of Argentina which includes several lakes in the upper part of its basin. This upper part shows lesser fish species richness than the lower section of the river. In this paper, an analysis of community structure of secondary and tertiary consumers and its autecology are presented. Among the 14 fish species recorded, 3 were mainly or totally piscivorous as adults. They constituted 11.4% of the numeric abundance and 10.8% of the biomass. Their numeric abundance was 89% (Oligosarcus jenynsii), 11% (Rhamdia sapo), and 0.5% (Hoplias malabaricus malabaricus), and their relative biomass was 61%, 33%, and 6%, respectively. Length/weight ratio, condition factor, and cephalic index indicate that... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characiformes; Siluriformes; Predation; Biocenology; Lentic environments; Pampean lakes; Trophic levels. |
Ano: 2003 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2003000200009 |
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Martínez,José Gregorio; García,Víctor Atencio; Carrasco,Sandra Pardo. |
The endangered bocachico Prochilodus magdalenae is a native freshwater fish of Colombia, the most captured species locally and one of the most important species for ex-situ conservation (germplasm banks). The aim of this study was to examine the effect of three concentrations of Dimethylsulfoxide (DMSO) (5%, 10%, 15%) and three of glucose (305, 333, 361 mM) in the extender on spermatic DNA fragmentation (F-DNA) (by Halomax®, Chromatin dispersion) and membrane damage (D-Me) (by eosin-nigrosin staining). After assessment of sperm quality by computer analysis of motility, one part of semen from males was diluted separately with three parts of extender and filled into 0.5 ml straws. Freezing was carried out in liquid nitrogen vapor dry shipper for 30 minutes... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characiformes; Cryobiology; Cytotoxicity; Genotoxicity; Germplasm. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300011 |
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Fernández-Osuna,María Alejandra; Scarabotti,Pablo Augusto. |
ABSTRACT Many South American characid fishes develop reversible dermal protuberances in the jaws to optimize aquatic surface respiration (ASR) during hypoxia. To date, basic aspects of this adaptation remain unknown, mainly due to the scarcity of experimental studies. In laboratory experiments, we determined time necessary for the complete formation and reversion of these structures in Piaractus mesopotamicus , and studied comparatively behavioral, morphological, and respiratory responses along gradients of dissolved oxygen (DO) concentration. Morphological changes during hypoxia consisted in dermal protuberances of lower lip, anterior border of maxillary and distal border of opercular valve, increasing the known number of structures modified. These... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aquatic surface respiration; Characiformes; Dermal lip protuberances; Reaction norm; River floodplains. |
Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000200210 |
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Carvalho,Fernando R.; Langeani,Francisco. |
Hyphessobrycon uaiso is described from the upper rio Paraná basin, rio Grande drainage, Minas Gerais State. The new species differs from its congeners by the short anal fin with 12-17 branched rays, and dorsal fin with ii,7-8 rays. Besides, it can be distinguished by the presence of i,5-6 pelvic fin rays, and by the coloration of the eyes (in life), slightly blue on the lower half and blackish on the upper half. New records of Hyphessobryconare recognized for the upper rio Paraná basin: H. eilyos Lima & Moreira, H. guarani Mahnert & Géry, and H. herbertaxelrodi Géry. The knowledge status about the ichthyofauna from the upper rio Paraná basin and comments about the type material of some species of Hyphessobrycon are briefly discussed. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characiformes; Conservation status; Headwaters; New records; Systematics. |
Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300525 |
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Bertaco,Vinicius A.; Lucinda,Paulo H. F.. |
A new characid species, Astyanax elachylepis, is described from the rio Tocantins drainage. The new species is distinguished from its congeners by possessing 48-53 perforated scales along the lateral line, a large caudal-peduncle spot, the presence of bony hooks on dorsal, anal, pelvic, and pectoral fins of males, one or two vertically-elongated humeral spots, one maxillary tooth, and 22-27 branched anal-fin rays. |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical; Characiformes; Astyanax microlepis; Taxonomy. |
Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252005000300006 |
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Oliveira,Claudio; Nirchio,Mauro; Granado,Ángel; Levy,Sara. |
Fish of the family Prochilodontidae are considered one of the most important components of commercial and subsistence fishery in freshwater environments in South America. This family consists of 21 species and three genera. In the present study, the karyotypes of Prochilodus mariae, Semaprochilodus kneri, and S. laticeps from Caicara del Orinoco, Bolivar State, Venezuela were studied. The species P. mariae, S. kneri and S. laticeps exhibited 2n=54 chromosomes (40 metacentric and 14 submetacentric), a single chromosome pair with nucleolus organizer regions, and a large amount of heterochromatin found at centromeric and pericentromeric positions in almost all chromosomes. The P. mariae specimens studied displayed 0 to 3 supernumerary microchromosomes. The... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Karyotype; C-band; NOR banding; Chromossome evolution; Characiformes. |
Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000100005 |
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Registros recuperados: 33 | |
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