Diel feeding chronology of the skate raja Agassizii (Müller &amp; Henle) (Pisces, Elasmobranchii) on the continental shelf off Ubatuba, Southeastern Brazil

Soares, Lucy Satiko Hashimoto; Vazzoler, Anna Emilia Amato de Moraes; Correa, André Roberto

doi:10.1590/s0101-81751999000100016

Cited by 10 publications

(9 citation statements)

References 22 publications

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“…The authors also observed that their results are different from results obtained by Soares et al (1999) and Muto et al (2001) on the coast of Ubatuba (SP State, Brazil). The results obtained by Barbini and Lucifora (2011) were similar to those found in the 2012-2013 sampling, with fish showing IRI values slightly higher than those for the group of decapods.…”

Section: Discussioncontrasting

confidence: 67%

“…According to Muto et al (2001), R. agassizii feeds on benthic items, mainly crustaceans such as shrimp and crabs, corroborated by the results obtained in the sample collected between [2005][2006]. Food chronology of this skate was also studied by Soares et al (1999), which concluded that its diets was also based on crustaceans and small teleostei fish. Soares et al (1999) and Muto et al (2001) performed his works on the coast of Ubatuba (Sao Paulo-SP State, Brazil) from scientific cruises, in a different sampling scenario from that conducted by commercial fishing boats.…”

Section: Discussionmentioning

confidence: 59%

“…Food chronology of this skate was also studied by Soares et al (1999), which concluded that its diets was also based on crustaceans and small teleostei fish. Soares et al (1999) and Muto et al (2001) performed his works on the coast of Ubatuba (Sao Paulo-SP State, Brazil) from scientific cruises, in a different sampling scenario from that conducted by commercial fishing boats.…”

Section: Discussionmentioning

confidence: 99%

“…After removal, their stomachs were weighed on a 1-g precision balance and classified at five levels in terms of repletion degree (RD): empty stomach = RD 0; almost empty (up to 25%) = RD I; half full (25-50%) = RD II; almost full (51-75%) = RD III; and full stomach (>75%) = RD IV (Soares et al, 1999;Dolgov, 2005).…”

Section: Methodsmentioning

confidence: 99%

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Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil

et al. 2016

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Catches and exports of skate Rioraja agassizii place this species as "vulnerable to extinction" on the IUCN Red List; therefore, biological and ecological knowledge becomes an important instrument for its conservation control. This study described and quantified the diet composition of R. agassizii by means of stomach analysis contents in the periods 2005-2006 and 2012-2013. We analyzed and quantified stomach contents in terms of abundance (%N), weight (%M), frequency of occurrence (% FO), and index of relative importance (IRI). The results showed differences in the food rates between the periods. However, the groups of food items were the same: Teleostei fish, decapods, and mollusks. In 2005-2006, the diet consisted mainly of shrimp, however, in 2012-2013 it consisted of fish, followed by decapods, especially shrimps. The differences in diets may be attributed to shrimp abundance, which do not characterize a change in the eating habits in 2012-2013, because, in addition to fish, shrimps were also important food sources. The presence of a certain prey is more related to its availability rather than the feeding preference of skate. The amount of ingested items is associated to biological and environmental factors, so that further studies relating diet with capture area, seasonality, depth, and other factors should be conducted.Keywords: diet, feeding ecology, feeding preference, prey, stomach content. Análise quantitativa dos hábitos alimentares da raia Rioraja agassizii (Elasmobranchii, Rajidae) do Sudeste e Sul do Brasil ResumoA raia-santa, Rioraja agassizii é uma espécie endêmica da qual pouco se conhece sobre sua biologia e ecologia, o que a leva a ser classificada como "vulnerável a extinção". O objetivo foi identificar e quantificar a composição da dieta alimentar da R. agassizii através da análise do conteúdo estomacal de exemplares capturados nos períodos de 2005-2006 e 2012-2013. Foram analisados os conteúdos alimentares e quantificados em abundância (N%), peso (M%), frequência de ocorrência (FO%) e índice de importância relativa (IRI) de cada item. Os resultados mostraram que em 2012-13 a dieta foi composta por peixes, seguido de decápodes, especialmente camarões, entretanto em 2005-06 foi composta basicamente por camarões. A diferença nas dietas não quer dizer que os hábitos alimentares mudaram, pois em 2012-13 além dos peixes, os camarões também foram classificados como maior importância alimentar. Considerando que a quantidade e variedade dos itens ingeridos está relacionada, principalmente, a fatores ambientais são necessários mais estudos que relacionem áreas de captura, sazonalidade e profundidade.Palavras-chave: dieta, ecologia alimentar, preferencia alimentar, presa, conteúdo estomacal.

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Section: Discussioncontrasting

confidence: 67%

Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil

et al. 2016

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“…A carcinophagous diet, with a secondary importance of teleosts, was found in other studies of R. agassizi. In the studies of Soares et al (1992;1999) and Muto et al (2001) in São Paulo, crustaceans were the main food item and teleosts were secondary, in addition to polychaetes. The same behavior was observed for the species in Uruguay and Argentina by Barbini, Lucifora (2012).…”

Section: Discussionmentioning

confidence: 99%

Feeding ecology of elasmobranch species in southeastern Brazil

2017

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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. rutrum, which basically fed on small crustaceans, polychaetes and nematodes; and the other of R. lalandii and the larger rays R. agassizii and A. cyclophora, which preyed on teleost fish and brachyurans.Keywords: Alimentary index, Carcharhinidae, Demersal fishes, Rajidae.Devido à lacuna de conhecimento sobre os elasmobrânquios estudamos a ecologia alimentar de cinco espécies desse grupo, no litoral sul do Rio de Janeiro. Os exemplares foram capturados por rede de arrasto e espinhel de fundo, entre janeiro de 2006 e agosto de 2007. As dietas de Psammobatis rutrum e Psammobatis extenta se mostraram basicamente carcino-bentofagas, com uma largura de nicho estreito. Rioraja agassizii foi considerada carcino/ictio-bentófaga, também com uma largura de nicho estreita. A espécie se alimenta com peixe e camarão, mas em proporções diferentes de acordo com a idade e sexo. A dieta de Rhizoprionodon lalandii foi considerada ictiófaga e não é influenciada pela idade ou sexo. As análises destas espécies e Atlantoraja cyclophora indicaram a formação de dois grupos tróficos: um composto pelas raias menores, P. extenta e P. rutrum, que basicamente se alimentam de pequenos crustáceos, poliquetos e nematodas; e o outro de R. lalandii e as raias maiores R. agassizii e A. cyclophora, que predam peixes teleósteos e brachyuras.

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Dietary habits of the polkadot skate Dipturus chinensis in the East China Sea

2018

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Diel feeding chronology of the skate raja Agassizii (Müller & Henle) (Pisces, Elasmobranchii) on the continental shelf off Ubatuba, Southeastern Brazil

Abstract: ABSTRACT. The diet and diel feeding pattern of the skate Raja agassbi 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

Cited by 10 publications

References 22 publications

Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil

Analysis of food habits of skate Rioraja agassizii (Elasmobranchii, Rajidae) from southern Brazil

Feeding ecology of elasmobranch species in southeastern Brazil

Dietary habits of the polkadot skate Dipturus chinensis in the East China Sea

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