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| Honji,Renato Massaaki; Caneppele,Danilo; Moreira,Renata Guimarães. |
| O objetivo deste trabalho foi descrever a morfologia das gônadas do surubim-do-paraíba (F1) durante a reprodução induzida em cativeiro. Trinta fêmeas foram induzidas, tendo-se utilizado extrato hipofisário de carpa e gonadotrofina coriônica humana. Vinte e oito fêmeas responderam à indução, tendo liberado 238,80 g de ovócitos (taxa de fertilização: 24,33±8,35%). Após a extrusão dos gametas, os animais foram eutanasiados para análise morfológica das gônadas. Os testículos não apresentaram alterações morfológicas após a indução. Entre os ovários, 63,31% apresentaram má formação (desenvolvimento ímpar, não uniforme ou "afunilamento"), e o número de ovócitos liberados foi abaixo do obtido em reprodutores selvagens desta espécie. |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Steindachneridion parahybae; Ovários; Rio Paraíba do Sul; Testículos. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000800045 |
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| Moreira,Renata Guimarães; Mimura,Olga Martins; Lima,Rossana L.V. Andrade; Bernardino,Geraldo. |
| Body fluid ionic content of fishes varies with ambient. Variations in the plasmatic ionic concentration have also been related with sex or maturation cycle, once that reproduction modifies metabolic processes. In fishes, the gallbladder is an important osmoregulatory organ. So, the present work has been focused on the relation of plasmatic and biliar electrolytes with sex and maturation cycle, of the teleost fish Prochilodus scrofa at the resting and mature stages of gonadal cycle. The animals (28 males and 30 females) were collected at Cachoeira de Emas (Pirassununga, São Paulo) and they were fasted for three days before the experiments. Deteminations of Na+, K+, Mg++, and Ca++ were made by spectophotometry and Cl- by microtitulation. Comparisons of ionic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Osteichthyes; Characiformes; Prochilodus scrofa; Bile; Plasma; Ionic content. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751998000100019 |
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| Vaini,Jussara Oliveira; Mota,Kenneth Gabriel; Ojeda,Alejandra Paola; Barreiros,João Pedro; Moreira,Renata Guimarães; Hilsdorf,Alexandre Wagner Silva. |
| Abstract The dusky grouper, Epinephelus marginatus, is a well-known and widespread marine fish assessed as endangered by the International Union for the Conservation of Nature. Analyzing the genetic diversity of this species is, therefore, of utmost importance and necessary for conservation purposes. Microsatellites are molecular tools with advantages that are ideal for population analyses. This study provides the first set of species-specific microsatellite loci for E. marginatus that can be applied when assessing both intra- and interpopulation genetic variation. Twenty microsatellite loci were isolated and characterized for the dusky grouper by genotyping 20 individuals obtained from the North Eastern Atlantic Ocean (n = 4) and from the South Western... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Short tandem repeat; Population genetics; Conservation; Fishery; Marine resources. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000100074 |
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| Hainfellner,Patrick; Souza,Thiago Gonçalves de; Moreira,Renata Guimarães; Nakaghi,Laura Satiko Okada; Batlouni,Sergio Ricardo. |
| The objective of this study was to obtain information about the possible mechanisms related to poor reproductive performance in tropical rheophilic fish. To that effect, cages (Cs) and earthen ponds (EPs) were used as experimental systems to provide unsuitable and suitable conditions, respectively, for curimbatá (Prochilodus lineatus) breeders. Fish were maintained under experimental conditions for 18 months, and during this period females were randomly sampled every two months for biometric analysis (n=30), blood (n=5/sampling) and ovary (n=5/sampling). After this period EPs females (EPFs) and Cs females (CFs) were submitted to the induced breeding experiments. The results showed that rearing curimbatá for such long time in a cage at this stocking... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reproductive cycle; Spawning performance; Steroid levels; Tropical rheophilic fish. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252012000300014 |
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| Alonso,Felipe; Cánepa,Maximiliano; Moreira,Renata Guimarães; Pandolfi,Matías. |
| In this work we describe for the first time the social and reproductive behavior of the Neotropical fish Cichlasoma dimerus (Heckel, 1840) [Perciformes: Cichlidae], endemic to the Paraná River basin, using a comprehensive-integral approach, including morphological and physiological features. This substrate breeding fish has biparental care of the fry and presents a dominance hierarchy that determines access to breeding territories among males, and to males with territories among females. Gregarious behavior associated with a pale body color, was observed before reproductive behaviors started. Afterwards, a dominance hierarchy was established through aggressive interactions. Territorial individuals had bright body color patterns and non territorial an... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cichlidae; Cortisol; Gonadosomatic index; Gonadotropins; Somatolactin. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300009 |
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