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| Registros recuperados: 11 | |
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| Ludwig,Sandra; Patella,Raquel; Stoiev,Sérgio; Castilho-Westphal,Gisela; Girotto,Marcus V. F; Ostrensky,Antonio. |
| Among oysters, species of Crassostrea (Sacco, 1897) are the most attractive to aquaculture. In Brazil, the genus is represented by C. rhizophorae (Guilding, 1828) and C. brasiliana (Lamarck, 1819). Because the maturation and breeding technology is not well developed for these species, aquaculturists need a reliable method to decide the correct time to place spat collectors in the field, and to identify both species, which are morphologically similar. In this study a specific Multiplex PCR protocol was developed, using one pair of universal primers from 18S rDNA as a positive control and a pair of specific primers for each target species. The sensitivity and specificity of the protocol was evaluated. It detected C. rhizophorae DNA in low concentrations, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Multiplex PCR; Oysters; Plankton; Specific primers. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000400002 |
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| Costa,Paulo V.; Silva,Ubiratã A. T. da; Ventura,Robson; Ostrensky,Antonio; Angelo,Leandro. |
| Fish predation is thought to exert an important influence on the demographical dynamics of larvae and juveniles of estuarine brachyuran crabs but few studies have investigated this phenomenon in nature. In this study, fishes were captured during full moons (in January and February 2005), when many brachyuran species are known to release their larvae. Samples were carried out in the Pinheiros river, Guaratuba Bay, Paraná, Brazil. The stomach contents of collected fishes were surveyed to determine the species that are most likely to prey on brachyuran immature forms in this location. Two techniques were used to capture fishes: manual samplings, using a 5-mm mesh size net (1.8m depth), and bottom trawling with a 20-mm mesh size net. The collected specimens... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crab; Megalopae; Osteichthyes; Predator; Ucides cordatus; Zoeae. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000200005 |
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| Angelo,Leandro; Ventura,Robson; Ostrensky,Antonio; Perbiche-Neves,Gilmar; Boeger,Walter Antonio. |
| Objetivou-se com este estudo avaliar os impactos ambientais causados por um sistema de cultivo de camarões marinhos em tanque-rede sobre a qualidade da água e sobre a estrutura da comunidade zooplanctônica. O estudo foi realizado na Baía de Guaratuba, onde os cultivos eram realizados em 300 tanques-rede (3,6 m de comprimento, 3,6 m de largura e 2 m de profundidade) distribuídos em uma área de 4.200 m², em densidade de 720 camarões/m². As concentrações de amônia, nitrito e fosfato na água foram monitoradas e amostras de zooplâncton foram coletadas no local dos cultivos (ponto 1) e em outros três pontos localizados a aproximadamente 200 m para oeste, noroeste e sudeste dos tanques. O ponto 5, usado como controle, localizava-se a aproximadamente 1.000 m a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Guaratuba; Impacto ambiental; Isca-viva; Litopenaeus vannamei; Zooplâncton. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010001100001 |
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| Pestana,Debora; Ostrensky,Antonio; Tschá,Marcel Kruchelski; Boeger,Walter A.. |
| Foram realizadas coletas nos principais corpos hídricos do Paraná objetivando a prospecção de larvas do mexilhão dourado, Limnoperna fortunei (Dunker, 1857). Essa espécie de molusco vem colonizando diversos corpos hídricos na América do Sul desde sua introdução na Argentina, em 1991. Já atingiu os rios Paraná e Paraguai, tendo sua presença reportada nos estados do Mato Grosso do Sul, Paraná, São Paulo, Minas Gerais e Rio Grande do Sul. As coletas foram feitas no inverno e na primavera de 2007 e no verão e no outono de 2008, em 14 pontos amostrais ao longo dos rios Iguaçu, Piquiri, Ivaí (afluentes do rio Paraná) e Tibagi (afluente do rio Paranapanema). O presente estudo determinou a presença da espécie ao longo de todos os pontos do rio Iguaçu, em dois... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bioinvasões; Mexilhão dourado; Marcadores moleculares; Rios do Paraná. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492010003400001 |
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| Pestana,Débora; Pie,Marcio Roberto; Ostrensky,Antonio; Boeger,Walter Antonio; Andreoli,Cleverson; Franceschi,Francisco; Lagos,Patrícia. |
| The larval density of the invasive mussel Limnoperna fortunei (Bivalvia, Mytilidae) was monitored from January 2005 to February 2006 at two points along the Paraná and the Iguaçu Rivers, near Foz do Iguaçu, PR, Brazil. The results indicated two density peaks in the Paraná River: a lower peak between March and June and a higher peak in October. In the Iguaçu River, the values were much lower, yet they also showed a peak between September and October. A reduction in the reproductive activity was observed in both the rivers between July and August. The average larval density at the collection point in the Paraná reached 948.5 larvae/m³, with a peak of 2,999.5 larvae/m³ in October. The present study represented the first quantification of the larval density of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Invasive species; Golden mussel; Biofouling; Larval density. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300023 |
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| Ventura,Robson; Silva,Ubiratã A. T. da; Ostrensky,Antonio; Cottens,Kelly; Perbiche-Neves,Gilmar. |
| Target areas for Ucides cordatus (Linnaeus, 1763) restocking programs are often located far from the laboratory where larval rearing is developed. During translocation, the larvae are submitted to highly stressful conditions due to handling, packing, and transport activities. The aim of the present study was to assess the mortality rates of U. cordatus megalopae caused by different transportation procedures. Megalopae at loading densities of 50, 150, and 300 ind.L-1 were packed in double polyethylene 12 x 25 cm plastic bags with 200 ml of marine water at salinity 30. The bags were filled with oxygen at a proportion of 1:2 parts of water and sealed tightly. The trepidations during transport were simulated by the use of a shaker device (800... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cannibalism; Larvae; Mangrove crab; Stress; Transport. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600001 |
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| Pestana,Débora; Ostrensky,Antonio; Boeger,Walter Antonio Pereira; Pie,Marcio Roberto. |
| The golden mussel (Limnoperna fortunei, Mollusca: Bivalvia) is an invasive species that has been causing considerable environmental and economic problems in South America. In the present study, filtration rates of L. fortunei were determined in the laboratory under different temperatures (10, 15, 20, 25, 28, and 30 ºC) and two types of food (Algamac-2000® and the chlorophycean alga Scenedesmus sp.). There was a statistically significant relationship between time and filtration rates in the experiment using Scenedesmus sp., regardless of temperature. However, this pattern was absent in the experiment using Algamac, suggesting that the relationship between filtration rates and temperature might depend on the size of the filtered particles. In addition, there... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Invasive species; Condition index; Scenedesmus sp.; Algamac-2000®; Environmental impact. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100018 |
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| Registros recuperados: 11 | |
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