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| Registros recuperados: 33 | |
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| Maciel,Cláudia Maria Reis Raposo; Lanna,Eduardo Arruda Teixeira; Maciel Junior,Alaor; Donzele,Juarez Lopes; Neves,Clóvis Andrade; Menin,Eliane. |
| The objective of this work was to study the morphologic development and the swimming and feeding behaviors of piracanjuba larvae, Brycon orbignyanus Valenciennes (1849) (Characiformes, Characidae, Bryconinae), during the period from zero to 172 hours after hatching (standard length = 3.62 - 11.94 mm). The morphological analyses were accomplished by using a trinocular stereo microscope, while the behavioral analyses were performed through periodic observations. In 28 hours after hatching, the larvae (standard length = 6.25 ± 0.13 mm) showed the following structural and behavioral characteristics that made them become active predators able to overcome a larval critical phase, the beginning of exogenous feeding: presence of pigmented eyes, terminal and wide... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Behavior; Brycon orbignyanus; Characiformes; First feeding; Morphology; Ontogeny. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000500004 |
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| Bertaco,Vinicius A; Jerep,Fernando C; Carvalho,Fernando R. |
| Moenkhausia dasalmas is described from the upper rio Tocantins basin, in the Chapada dos Veadeiros region, Goiás State, Central Brazil. The new species differs from all congeners by the presence of iii,9 rays in the dorsal fin. It can also be distinguished from its congeners by the presence of two humeral spots (first one vertically elongate and second one faint), by the number of branched anal-fin rays (17-19), lateral line scales (36-37), maxillary teeth (4-5), and a vertical dark spot in the caudal peduncle end. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazilian Cerrado; Chapada dos Veadeiros; Characiformes; Tocantins-Araguaia basin. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000100003 |
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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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| 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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| Carvalho,Fernando R.; Jesus,Guilherme C. de; Langeani,Francisco. |
| One of the most gorgeous colored and endangered Hyphessobryconspecies, H. flammeus Myers, is redescribed. Diagnostic characters of the species are two vertically elongated humeral spots, no caudal peduncle blotch, 5-8 maxillary teeth, caudal fin hyaline, and longitudinal dark stripe of the body absent. Sexual dimorphism is present, with males being more colored than females and having bony hooks in the anal and pelvic fins, which are dark in their terminal portions. Comments about its occurrence in the upper rio Tietê drainage (upper rio Paraná basin), its conservation status, and the phylogenetic position into Characidae context are also presented. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characiformes; Engraçadinho; Flame tetra; Coastal streams; Endangered species. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200247 |
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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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| Thomé,Ralph G.; Bazzoli,Nilo; Rizzo,Elizete; Santos,Gilmar B.; Ratton,Thiago F.. |
| The reproductive biology of the piau-jejo Leporinus taeniatus Lütken, 1875, an endemic species from the São Francisco River basin, was studied by using macroscopical and histological techniques. A total of 121 males and 94 females were captured quarterly, between March 2002 and February 2003 in the Juramento Reservoir. Females were larger than males, indicating sexual dimorphism. Stages of gonadal maturation were defined from histological analyses and gonadosomatic index. Peaks of maturing/mature and spawned/spermiated fishes has occurred in period December-February. L. taeniatus presented total spawning and group-synchronic development of the oocytes. The gonadosomatic index accompanied gonad maturation in both sexes, and coelomic fat presented lower... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characiformes; Gonadal maturation; Piau-jejo; Reproduction; Total spawning. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752005000300006 |
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| Carneiro-Leite,Laicia; Bashiyo-Silva,Cristiane; Oliveira,Yasmim Alves Araújo; Borges,Laís Pedroso; Sanchez,Malbelys Padilla; Silva,Luciane Gomes da; Lobato,Stella Indira Rocha; Rodrigues-Lisoni,Flávia Cristina; Veríssimo-Silveira,Rosicleire; Ninhaus-Silveira,Alexandre. |
| Abstract This study aimed to determine the semen characteristics of Astyanax lacustris after hormonal induction and to evaluate the sensitivity of the species sperm to cryoprotective solutions based on the cryoprotectants dimethyl sulfoxide and methyl glycol. Volume, color, sperm concentration, total motility and aspects of sperm movement were analyzed using “Integrated Semen Analysis System”. Three different extenders were tested: A) glucose 5%+egg yolk 10%, B) BTS®5% and C) glucose 5% and two permeable cryoprotectants: dimethyl sulfoxide (Me2SO) and methyl glycol (MTG). Fresh A. lacustris semen presented total motility of 76.6±11.2%, motility duration of 33.0±2.2s, sperm concentration of 7.22±3.2×109sptz/mL and seminal osmolality of 219±0.03mOsm/kg-1.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characiformes; DNA integrity; Freezing; Semen quality; Yellow-tailed Lambari. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000300214 |
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| Burns,Michael D.; Chatfield,Marcus; Birindelli,José L. O.; Sidlauskas,Brian L.. |
| ABSTRACT Members of the Leporinus desmotes species complex can be distinguished from other barred or banded congeners by the combination of nine distinct black bars across the head and trunk and long, pointed, laterally compressed and upward curving symphyseal dentary teeth. A taxonomic reassessment of this complex revealed two new species, one from the Orinoco and Negro rivers of Venezuela and Brazil, and the other from the Xingu and Tapajós rivers of Brazil. Both species are similar to L. desmotes and L. jatuncochi, but differ significantly in body shape morphology, coloration, and/or circumpeduncular scale counts. Genetic evidence also contributes to the recognition of both new species. This contribution also maps the geographic distribution of the four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anostomidae; Characiformes; Morphology; South America; Taxonomy. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200219 |
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| Carvalho,Tiago Pinto; Bertaco,Vinicius Araújo. |
| Two new species of Hyphessobrycon are described from the upper rio Tapajós basin, Mato Grosso, Brazil. Hyphessobrycon melanostichos is distinguished from its congeners by the combination of a conspicuous longitudinal broad black band beginning on the posterior margin of orbit and reaching the tip of middle caudal fin rays, a distinct vertically elongate humeral spot, and 16 to 18 branched anal-fin rays. Hyphessobrycon notidanos is distinguished from its congeners by the combination of an elongate dorsal fin in mature males, a vertically elongate humeral spot, 2-4 maxillary teeth, iii,8 dorsal-fin rays, and 16 to 21 branched anal-fin rays. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical; Characiformes; Amazon; Taxonomy; Endemism; Fish. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252006000300001 |
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| Fukakusa,Clayton Kunio; Mazzoni,Talita Sarah; Malabarba,Luiz Roberto. |
| Abstract Most teleosts are externally fertilizing, with internal fertilization occurring as a relatively rare event. Until now, Euteleosteomorpha is the only teleost cohort known to undergo internal fertilization. In the teleost cohort Otomorpha, it has been recorded the presence of sperm in the ovaries of some species of Characiformes and Siluriformes, but no fertilized eggs have been found so far in the female reproductive tract. It has been presumed that oocytes can be released into the water with associated spermatozoa and only there becomes fertilized, and the term insemination has been used to characterize the strategy adopted by these fish. Here, we present the discovery of the first case of internal fertilization in the teleost cohort Otomorpha, in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Characiformes; Insemination; Ostariophysi; Reproduction; Spawning. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000100209 |
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| Registros recuperados: 33 | |
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