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| Fonseca,Alinca Peres da; Volcan,Matheus Vieira; Romano,Luís Alberto; Robaldo,Ricardo Berteaux. |
| ABSTRACT Laboratory breeding of annual fish is often impaired when fish fail to inflate the swim bladder after hatching. These fish, which are known as belly-sliders, cannot swim in the water column, moving mainly on the bottom of water. Therefore, we wanted to understand the factors underlying failed inflation of swim bladder in the annual fish Austrolebias nigrofasciatus and determine the implications of this condition on the growth of juveniles. To identify how the initial filling of the gaseous vesicle is compromised, and to determine the implications of this condition on juvenile growth, we analysed the histology of the swim bladder of both normal swimming fish and belly-sliders during their initial growth phase (first month of life). In addition to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Belly-sliders; Hatching; Killifish; Laboratory breeding; Pathology. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400205 |
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| Fonseca,Alinca Peres da; Volcan,Matheus Vieira; Sampaio,Luís André; Romano,Luís Alberto; Robaldo,Ricardo Berteaux. |
| Given the importance of knowledge of the biology of endangered species for the planning of conservation and management efforts, the aim of this study was to investigate the influence of temperature on the growth of Austrolebias wolterstorffi (Ahl, 1924). To clarify the thermal influence on the growth of the species, temperatures of 16, 20, 24 , and 28°C were tested in triplicate. The present study showed that a water temperature of 28°C is detrimental to the growth of the species. Among the other tested temperatures, it was found that the optimum temperature for growth decreases as an individual ages and is slightly lower for females. It was demonstrated here that males reach a higher weight and length, and grow faster than females, reaching sexual... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Endangered species; Length; Maturity; Weight. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000400837 |
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| Pereira Jr,Joaber; Fernandes,Berenice M.M; Robaldo,Ricardo Berteaux. |
| Micropogonias furnieri (Desmarest, 1823) from the coast of Rio Grande do Sul State were examined and six trematodes species were recovered: Aponurus laguncula Looss, 1907, A. pyriformis (Linton, 1910), Monascus filiformis (Rudolphi, 1819), Opecoeloides catarinensis Amato, 1983, O. stenosomae Amato, 1983, and Pachycreadium gastrocotylum (Manter, 1940). All species are registered for the first time in Rio Grande do Sul State and M. furnieri represents a new host record for A. laguncula, A. pyriformis and M. filiformis. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Trematoda; Digenea; Micropogonias furnieri; Rio Grande do Sul State. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000300013 |
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| Volcan,Matheus Vieira; Fonseca,Alinca Peres da; Figueiredo,Mário Roberto Chim; Sampaio,Luís André; Robaldo,Ricardo Berteaux. |
| This study evaluated the effect of temperature on growth of Austrolebias nigrofasciatus, an endemic and threatened annual killifish species of the Patos-Mirim lagoon system in Southern Brazil. In order to verify the effect of temperature on initial growth of A. nigrofasciatus, eggs stored in the laboratory were hatched and juveniles reared for eight weeks at 16 and 22 ºC. The standard length of newly hatched fishes was 4.67 ± 0.25 mm and after eight weeks they reached 23.68 ± 3.73 and 22.68 ± 5.36 mm, respectively at 16 and 22 ºC. However, initial growth of fish reared at 22 ºC was faster and they reached sexual dimorphism at an earlier age compared to those reared at 16 ºC. Final length of females reared at 22 ºC was 23.00 ± 2.83 mm, they were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annual fish; Laboratory conditions; Cyprinodontiformes; Rivulidae. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032012000400007 |
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| Corrêa,Bruna Ferraz; Stohl,Franciele Elisa; Robaldo,Ricardo Berteaux; Pereira,Daniela Isabel Brayer. |
| Com o aumento da produtividade na piscicultura, os peixes são expostos a altas densidades de estocagem que podem levar ao estresse e imunossupressão. Essa condição favorece a ocorrência de infecções, entre elas a saprolegniose que afeta os peixes e seus ovos, causando sérios prejuízos econômicos aos piscicultores. Dessa forma, compostos químicos eficazes e "ambientalmente amigáveis" são almejados para o controle da doença. O objetivo do presente estudo foi avaliar a suscetibilidade in vitro de 12 isolados de Saprolegnia spp., provenientes dos peixes-rei dulceaquícolas Odontesthes bonariensis e O. humensis. Para isso, testes de suscetibilidade, avaliando a inibição do crescimento micelial de Saprolegnia spp., foram realizados frente a seis químicos (cloreto... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oomicetos; Odontesthes; Saprolegniose; Agentes químicos; Suscetibilidade. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000600012 |
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| Martins,Gabriel Bernardes; Piedras,Sérgio Renato Noguez; Pouey,Juvêncio Luís Osório Fernandes; Bongalhardo,Denise Calisto; Robaldo,Ricardo Berteaux. |
| Attempting to improve reproduction performance and ichthyo prophylaxis, this study evaluated the effects of maintaining silver catfish (Rhamdia quelen) broodstock in different saline concentrations (0, 2, 4, 6 and 8‰) on gametes quality and reproductive viability. The results showed that sperm percent motility did not change between 0 and 4‰, but it was reduced at 6‰, and sperm became immotile at 8‰ salinity. Sperm motility time was increased (almost five fold) at 6‰. Salinities up to 4‰ prevented fertilization and hatching, proving their deleterious effects on oocytes and embryos. Therefore, media up to 4‰ salinity may be an alternative for icthyo prophylaxis, although fertilization and incubation must be done in freshwater medium |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Semen; Motility; Eggs; Fertilization; Salt. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000300458 |
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