Results 141 to 150 of about 284 (163)

Gametogenesis and seminatural reproduction of the Amazon twospot astyanax Astyanax bimaculatus (Linnaeus, 1758) cultivated in an enriched environment

Animal Reproduction Science
Environmental enrichment is used to provide well-being to the animals, such as fish, in captive conditions, mimicking their natural habitat. It may influence fish behavior, physiology, and survival. In terms of reproduction, however, the relationship between environment enrichment and successful reproduction in captivity is still poorly explored in ...
Bianca Lima, de Sousa, Suianny Nayara, Chaves, Eduardo, Albuquerque, Jeane, Rodrigues, Vanessa, Coimbra, Saynara, Miranda, Ana Luiza, Caldas, Marissol, Leite, Matheus Pereira, Dos Santos, Ruy Alberto Caetano, Côrrea Filho, Adam Dreyton Ferreira Dos, Santos, Caio, Maximino, Diogenes, Siqueira-Silva   +12 more
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Effects of aluminum on the energetic substrates in neotropical freshwater Astyanax bimaculatus (Teleostei: Characidae) females

Comparative Biochemistry and Physiology Part C: Toxicology & Pharmacology, 2013
We investigated the effects of acidic pH and acute aluminum (Al) exposure on the metabolic substrates of Astyanax bimaculatus, and on the ability of these animals to recover in clean water. After an acclimation period, sexually mature A. bimaculatus females were sorted into six glass aquaria with three experimental groups: control in neutral pH (7.0 ...
Vanessa A R O, Vieira, Tiago G, Correia, Renata G, Moreira   +2 more
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Comparative cytogenetics and molecular phylogeography in the group astyanax altiparanae--Astyanax aff. bimaculatus (Teleostei, Characidae).

Cytogenetic and genome research, 2011
The genus Astyanax comprises small characin fish of the neotropical region. The so-called 'yellow-tailed characins' compose one of the most widely distributed Astyanax groups. A. altiparanae and A. aff. bimaculatus, are evolutionarily closely related and commonly found in several Brazilian hydrographic basins.
K F, Kavalco, R, Pazza, K D O, Brandão, C, Garcia, L F, Almeida-Toledo   +4 more
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Integrative Taxonomy Suggests Resurrection of Species of the Astyanax bimaculatus Group (Characiformes, Characidae)

Zebrafish
Using integrative tools can be effective for species identification, especially in complex groups like Astyanax. Astyanax bimaculatus group is composed of six valid species, including A. lacustris. "A. altiparanae", "A. asuncionensis", and "A. jacuhiensis" are considered as junior synonyms of A. lacustris. Seeking to test the operational taxonomic unit
Mariane Gavazzoni, Flavia C. Brezinski, Thiago H. Pedroso, Carla S. Pavanelli, Weferson J. da Graça, Daniel R. Blanco, Roberto L. Lui, Vladimir P. Margarido   +7 more
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Heat Resistance and Thermal Acclimation Rate in Tropical Tetra Astyanax bimaculatus of Venezuela

Environmental Biology of Fishes, 2000
Venezuelan river tetra, Astyanax bimaculatus juveniles of 34.1–36.7 mm standard length and 0.83–1.0 g wet weight were acclimated for four weeks to 24–33°C, which are approximate average minimum and maximum river temperatures throughout the year. The fish acclimated to 24, 27, 30, and 33°C were exposed for 10 000 minutes at 35, 36, 37, 38, and 39°C to ...
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Histochemical and immunohistochemical study on endocrine cells (5HT, GAS, and SST) of the gastrointestinal tract of a teleost, the characin Astyanax bimaculatus

Acta Histochemica, 2015
Endocrine cells secrete hormones through the mucosa of the gastrointestinal tract (GIT) and act on the overall regulation of digestive processes such as nutrient absorption, gut motility and intestinal blood flow. This study aimed to determine regional distribution and frequency of endocrine cells secretory of serotonin (5-HT), somatostatin (SST) and ...
Nathália das Neves, Cardoso, Enely Maris da Silveira, Firmiano, Iracema D, Gomes, Aparecida A, do Nascimento, Armando, Sales, Francisco G, Araújo   +5 more
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Phylogeography and Historical Biogeography of the Astyanax bimaculatus Species Complex (Teleostei: Characidae) in Coastal Southeastern South America

Zebrafish, 2018
Abstract Astyanax bimaculatus , a ubiquitous species in many Neotropical basins, is characterized by a complex taxonomy and are currently considered a species complex. The goal of this study was to analyze 31 populations ( N  = 136) of this species from ...
Marina S, Cunha, Aline R, Fregonezi, Lucioni, Fava, Alexandre W S, Hilsdorf, Lucio A O, Campos, Jorge A, Dergam   +5 more
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Morphologically Cryptic Species of the Astyanax bimaculatus “Caudal Peduncle Spot” Subgroup Diagnosed Through Cytogenetic Characters

Zebrafish, 2018
Astyanax is a species-rich polyphyletic genus distributed between the southern United States and central Argentina. The genus contains groups of cryptic species, which are difficult to distinguish, and are sometimes identified wrongly. Basic and molecular cytogenetic analyses were run on Astyanax abramis and three junior synonyms of Astyanax lacustris:
Mariane, Gavazzoni, Leonardo M, Paiz, Carlos A M, Oliveira, Carla S, Pavanelli, Weferson J, Graça, Vladimir P, Margarido   +5 more
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Oogenesis and in Vitro Reproduction of the Twospot Astyanax Astyanax Bimaculatus (Linnaeus, 1758) Submitted to the Conspecific Alarm Substance

2023
Jeane Rodrigues, Maria Rosa-Silva, Hadda Tercya, Paulo Jesus, Saynara Miranda, Hingrid Oliveira, Bianca Lima, Ludmylla Santos, Caio Maximino, Diógenes Siqueira-Silva   +9 more
openaire   +1 more source

Characterization of a new cytotype and ocurrence of a B microchromosome in two spot astyanax, Astyanax bimaculatus Linnaeus, 1758 (Characiformes: Characidae)

Journal of Fish Biology, 2023
De Oliveira Ehc, Marcelo Vallinoto, Sousa R P C   +2 more
exaly