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| Registros recuperados: 10 | |
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| Díaz-Andrade,María Constanza; Lopez-Cazorla,Andrea; Galíndez,Elena Juana. |
| Chondrichthyes constitute a conserve and vulnerable clade of increasing importance. However, there is scarce knowledge about the morphological aspects of the reproduction, so that only one work exists about the structure of the gravid uterus of an oviparous species. The work presented here describes the morphological, histological and histochemical remarks of the uterus of two Rajids of the Sympterygia genus along the life cycle. Both species presented paired uteri that lead independently to a common urogenital sinus. The uteri of immature females are filiform, translucent and unspecialized tubes. When sexual development starts, all the genital system displays a transitional and progressive change. In all studied females, independently of the maturing... |
| Tipo: Journal article |
Palavras-chave: Chondrichthyes; Rajidae; Uterus; Sympterygia. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000300014 |
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| Viana,Alessandra F.; Valentin,Jean L.; Vianna,Marcelo. |
| ABSTRACT The feeding ecology of five elasmobranch species was studied on the southern coast of Rio de Janeiro, southwestern Atlantic Ocean. The specimens were caught with a trawl or bottom longline between January 2006 and August 2007. The diets of Psammobatis rutrum and Psammobatis extenta appeared to be basically carcino-benthophagous, with a very small niche width. Rioraja agassizii was basically carcino/ichthyo-benthophagous, also with a narrow niche, including teleost fish and shrimp, but in different proportions according to age and sex. Rhizoprionodon lalandii was ichthyophagous, not influenced by age or sex. The analyses of these species and Atlantoraja cyclophora indicated two trophic groups: one composed of the smaller rays, P. extenta and P.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alimentary index; Carcharhinidae; Demersal fishes; Rajidae. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252017000200220 |
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| Scenna, L.B.. |
| Se estudia la biología y ecología reproductiva de las ocho especies de Bathyraja presentes en la plataforma continental argentina (Atlántico S.O.), a través del análisis del tamaño corporal, las cápsulas de huevos, el desarrollo de los embriones, la talla de madurez sexual, las variaciones en las condiciones reproductivas, las áreas de puesta y la segregación espacial de los individuos. El material examinado provino de campañas de investigación llevadas a cabo por el Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) entre 34º40'S y 54º30'S, desde septiembre 2003 hasta octubre 2007. La información presentada en el trabajo demuestra que las especies del Género Bathyraja en la plataforma argentina maduran a una talla alta en relación a la Lt... |
| Tipo: Theses and Dissertations |
Palavras-chave: Reproduction; Biogeography; Morphometry; Fish eggs; Sexual maturity; Spawning grounds; Marine fish; Rajidae; Marine environment. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4776 |
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| Reis,Marcelo; Figueira,Will F.. |
| ABSTRACT Bottom-dwelling elasmobranchs, such as guitarfishes, skates and stingrays are highly susceptible species to bycatch due to the overlap between their distribution and area of fishing operations. Catch data for this group is also often merged in generic categories preventing species-specific assessments. Along the east coast of Australia, the Eastern Fiddler Ray, Trygonorrhina fasciata (Muller & Henle, 1841), and the Sydney Skate, Dentiraja australis (Macleay, 1884), are common components of bycatch yet there is little information about their age, growth and reproductive timing, making impact assessment difficult. In this study the age and growth (from vertebral bands) as well as reproductive parameters of these two species are estimated and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Age and growth; Rajidae; Rhinobatidae; Sexual maturity. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702020000100323 |
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| Viana,Alessandra da Fonseca; Vianna,Marcelo. |
| The stomach contents of the eyespot skate, Atlantoraja cyclophora (Regan, 1903), were examined with the goal to provide information about the diet of the species. Samples were collected off the southern coast of Rio de Janeiro, Brazil, near Ilha Grande, between January 2006 and August 2007, at a depth of about 60 m. The diet was analyzed by sex, maturity stages and quarterly to verify differences in the importance of food items. The latter were analyzed by: frequency of occurrence, percentage of weight and in the Alimentary Index. The trophic niche width was determined to assess the degree of specialization in the diet. Additionally, the degree of dietary overlap between males and females; juveniles and adults and periods of the year were defined. A total... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diet; Elasmobranch; Trophic niche; Rajidae; Rio de Janeiro. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702014000200003 |
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| BRACCINI,JUAN M.; CHIARAMONTE,GUSTAVO E.. |
| Psammobatis extenta es un miembro común de la fauna de rayas de las costas de Sudamérica y su biología ha sido poco estudiada. Se investigaron aspectos de la biología de P. extenta a partir de datos obtenidos del descarte de arrastres comerciales de la flota pesquera de Puerto Quequén, Argentina, en febrero de 2000. La talla máxima alcanzada por las hembras fue 313 mm L T y 295 mm L T, por los machos. Las proporciones que presentaron menor variación y relación isométrica fueron: distancia narina-boca, distancia interorbital, longitud ojo+espiráculo, largo de disco y ancho de disco. La relación L T-Peso total presentó diferencias significativas (P < 0,05) entre hembras y machos, las primeras alcanzando un mayor peso para el mismo L T. Los machos alcanzan... |
| Tipo: Journal article |
Palavras-chave: Psammobatis; Rajidae; Puerto Quequén. |
| Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000100017 |
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| Gomes,Ulisses Leite; Picado,Simone da Silva. |
| The Caribbean skate Dipturus teevani (Bigelow & Schroeder, 1951) is recorded for the first time from Brazilian waters. The specimen was collected in the continental slope off Bahia State. With this record, four species of Dipturus Rafinesque, 1810 are known from Brazil: D. chilensis (Guichenot, 1848), D. leptocauda (Kreft & Stehmann, 1975), D. trachyderma (Krefft & Stehmann, 1975) and D. teevani (Bigelow & Schroeder, 1951). They are typical inhabitants of deep waters between the outer shelf edge (195-200m) and the slope (more than 500m). Although morphologically conservative, the species of Dipturus can be distinguished from each other by the number of dorsal and nuchal thorns, the number of caudal thorns, dorsal and ventral... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rajidae; Dipturus; Distribution; Brazil. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000100021 |
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| Soares,Lucy Satiko Hashimoto; Vazzoler,Anna Emilia Amato de Moraes; Correa,André Roberto. |
| The diet and diel feeding pattern of the skate Raja agassizii were investigated through analysis of stomach contents. A total of 280 stomachs were collected by a series of hauls during a daily cycle in three periods, 8-10 January 1987, 22-24 July and 2-4 December 1988, from the inner continental shelf of the coastal ecosystem of Ubatuba, São Paulo State, Brazil (25º35'S; 45º00'W). According to the results of the stomach fullness and of the number of fresh prey, it is suggested that this species presents continuity in the feeding activity during a day. The stomach contents were mainly composed of crustaceans. Nematodes, polychaetes and fishes also occurred. No changes were observed in dietary composition between day and night. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rajidae; Diel feeding; Food habits; Marine demersal fish; Southwestern Atlantic. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751999000100016 |
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| MUTO,E. Y.; SOARES,L. S. H.; GOITEIN,R.. |
| The feeding habits of Rioraja agassizii (syn. Raja agassizii) and Psammobatis extenta (syn. Psammobatis glansdissimilis) of the South-eastern Brazilian coast were studied by means of stomach content analysis. The samples were obtained on eight seasonal oceanographic cruises, carried out between October 1985 and July 1987. The importance of each food item was evaluated on the basis of the Index of Relative Importance and the feeding similarity by Percentage of Similarity. The results indicated that both species are benthic feeders, preying mainly on Crustacea, especially Amphipoda, Caridea and Brachyura. Teleostei were also important for R. agassizii. Seasonal variation of the diet seems to be associated with the availability of the prey, whose distribution... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rajidae; Stomach content; Feeding habits; South Atlantic; Brazil. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200005 |
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| Registros recuperados: 10 | |
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