&lt;b&gt;Morphological aspects related to feeding of two marine skates &lt;em&gt;Narcine brasiliensis Olfers&lt;/em&gt; and &lt;em&gt;Rhinobatos horkelli&lt;/em&gt; Müller &amp; Henle&lt;/b&gt; - DOI: 10.4025/actascibiolsci.v20i0.4468

Goitein, Roberto; Torres, Fernando S.; Sgnirini, Carlos Eduardo

doi:10.4025/actascibiolsci.v20i0.4468

Cited by 9 publications

(12 citation statements)

References 8 publications

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“…They also exhibit a high degree of interspecific variation in jaw and teeth morphology, showing different feeding performance and thereby allowing a widely varied diet (Goiten et al, 1998;Wilga & Motta, 1998;Dean et al, 2007). In fact, besides the anti-predatory tactics, abundance of prey in the environment, and interspecific competition, food ingestion is highly dependent on the morphology and behaviour of the predator (Moyle & Cech Jr, 1982;Heithaus 2004).…”

Section: Discussionmentioning

confidence: 97%

Feeding comparisons of four batoids (Elasmobranchii) in coastal waters of southern Brazil

et al. 2014

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Food partitioning between species is a common strategy for avoiding resource competition which allows the coexistence of two or more species in the same place. In order to evaluate the feeding of four species of batoids regularly caught by artisanal fisheries in southern Brazil, the present study aimed to analyse and compare the diet of the four batoid species. The Chola guitarfish, Rhinobatos percellens, had a specialized diet, consisting predominantly of blue crabs Callinectes sp., followed by teleost fish. The Lesser guitarfish Zapteryx brevirostris also had a very specialized diet, consuming mainly on Polychaeta, followed by Caridea shrimp. The Cownose ray, Rhinoptera bonasus, fed mainly on Ophiuroidea, followed by Gastropoda and Bivalvia. Finally, the Rio skate Rioraja agassizi, fed on teleost fish, Gammaridae, Caridea shrimp and Dendrobranchiata shrimp. An analysis of similarity showed significant differences among species in their diet. The trophic levels of the batoids in this study are ,4.0, placing them in intermediate trophic levels. The analysis of the diets indicates that feeding differs substantially among the four species, suggesting a partitioning of food resources available in the environment.

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Section: Discussionmentioning

confidence: 97%

Feeding comparisons of four batoids (Elasmobranchii) in coastal waters of southern Brazil

et al. 2014

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“…Guitarfishes (Rhinobatidae) have evolved special morphological features ( e.g . large mouth opening, flat and slender body with a proportionally lesser width and height than other rays), which allow them to feed on a wide variety of fast‐moving organisms, as well as slower benthic prey (Goitein et al , 1998; Dean et al , 2007). The present results indicate that the feeding habits of Z. xyster are very diverse, with a diet dominated by shrimps, several demersal teleosts, crabs and cephalopods; other prey taxa such as stomatopods and polychaete were less important.…”

Section: Discussionmentioning

confidence: 99%

Diet composition and diel feeding behaviour of the banded guitarfish Zapteryx xyster along the Pacific coast of Costa Rica, Central America

Espinoza

Clarke

Villalobos-Rojas

et al. 2012

Journal of Fish Biology

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The diet and diel feeding behaviour of the banded guitarfish Zapteryx xyster were examined along the Pacific coast of Costa Rica. A sample of 235 stomachs was collected between March 2010 and December 2011 as part of an ongoing shrimp-trawl by-catch monitoring programme. Samples from multiple day and night periods allowed testing the hypothesis that Z. xyster is more active at night, thus increasing the amount of food intake during night-time. Overall, shrimps (52·3% prey-specific index of relative importance, P(SIRIi) ) and teleosts (27·2% P(SIRIi) ) were the most important prey categories. Juveniles fed primarily on smaller shrimps (Solenocera spp.), while adults shifted to larger prey. The amount of food consumed (as % of bodymass) by juvenile and adult Z. xyster increased significantly between 0400 and 1200 hours, while the proportion of empty stomachs decreased during the same time interval. These findings contradict the hypothesis that Z. xyster is more active and feeds at night. The study also revealed that Z. xyster, particularly juveniles, forage on several shrimp species and overlap spatially with the Costa Rican bottom-trawl fisheries. This has important management and conservation implications as Z. xyster may be experiencing high by-catch rates, and because of their life history is presumed to be vulnerable to intense levels of exploitation.

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“…Esta especie es especialista en su dieta consumiendo mayoritariamente camarones, en especial de la familia Penaeidae y del género Trachypenaeus. Estos resultados concuerdan con lo reportado para otras especies del género en África, el Mediterráneo, California y Brasil (Caverivieré & Rabarison-Andriamirado, 1997;Goitein et al, 1998;Shibuya et al, 2005;Basusta et al, 2007;Ismen et al, 2007). Aparentemente R. leucorhynchus, al igual que las otras especies de su género, no está adaptada para perseguir activamente peces de media agua (Talent, 1982).…”

Section: Discussionunclassified

Biologia de la raya guitarra Rhinobatos leucorhynchus (Günther, 1867) (Rajiformes: Rhinobatidae) en el Pacifico colombiano

Payán¹,

Navia²,

Rubio³

et al. 2011

lajar

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RESUMEN.La raya guitarra Rhinobatos leucorhynchus es comúnmente capturada como fauna acompañante en la pesca del camarón de aguas someras del Pacífico colombiano, tanto a nivel industrial como artesanal. A partir de 286 ejemplares capturados incidentalmente entre 2001 y 2007, se estudiaron diferentes aspectos biológicos de esta especie. Las hembras fueron proporcionalmente más grandes que los machos, aunque el crecimiento fue similar en ambos sexos (alométrico). Los embriones no presentaron diferencias sexuales significativas ni en talla ni en peso. La proporción sexual en adultos fue 2,4:1 (hembras-machos), mientras que en embriones esta proporción fue de 1:1. El 51,5% de machos presentó claspers desarrollados y calcificados y el 56,5% de las hembras estaban grávidas, presentando fecundidades entre 1 y 6 embriones, con tallas entre 3 y 19,5 cm, sugiriendo una talla de nacimiento entre 19 y 19,5 cm LT. La talla mediana de madurez de las hembras fue menor que la de machos (48,48 cm y 51,18 cm LT, respectivamente), y las hembras presentaron crías a partir de 44 cm LT. Los hábitos alimentarios de esta especie mostraron 30 ítems presa, con camarones de la familia Penaeidae, y especialmente Trachypenaeus sp. como alimento principal. La raya guitarra presentó diferencias significativas en la dieta de machos y hembras, y la amplitud de nicho indicó que es especialista en su dieta. Los resultados de este estudio aportan información útil para plantear medidas de manejo de R. leucorhynchus, especie que requiere atención, dado sus características biológicas y su importancia comercial y de consumo. Palabras clave: batoideos, reproducción, crecimiento, dieta, ecología alimentaria. Biology of the guitar ray Rhinobatos leucorhynchus (Günther, 1867) (Rajiformes: Rhinobatidae) in the Colombian PacificABSTRACT. The guitar ray Rhinobatos leucorhynchus is commonly caught as by-catch of industrial and artisanal shrimp trawling in the shallow waters of the Colombian Pacific. The biological aspects of this species were studied using 286 animals caught as by-catch between 2001 and 2007. The females were proportionally larger than males, although growth was similar (allometric) for both sexes. The embryos showed no significant differences by sex in either size or weight. The adult sex ratio was 2.4:1 (females-males), whereas in embryos this ratio was 1:1. 51.5% of males, 51.5% had developed, calcified claspers, and 56.5% of females were pregnant, carrying between 1 and 6 embryos of 3 to 19.5 cm, suggesting a size at birth of 19 to 19.5 cm TL. The median size at maturity for females was lower than that of males (48.48 cm and 51.18 cm TL, respectively), and the females had embryos starting at 44 cm TL. The feeding habits of this species showed 30 prey items, with shrimp from the Penaeidae family and especially Trachypenaeus sp. as main food. The diets of male and female guitar rays differed significantly, and the niche breadth indicated that this species has a specialist diet. The results of this study provide useful information for propos...

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<b>Morphological aspects related to feeding of two marine skates <em>Narcine brasiliensis Olfers</em> and <em>Rhinobatos horkelli</em> Müller & Henle</b> - DOI: 10.4025/actascibiolsci.v20i0.4468

Cited by 9 publications

References 8 publications

Feeding comparisons of four batoids (Elasmobranchii) in coastal waters of southern Brazil

Feeding comparisons of four batoids (Elasmobranchii) in coastal waters of southern Brazil

Diet composition and diel feeding behaviour of the banded guitarfish Zapteryx xyster along the Pacific coast of Costa Rica, Central America

Biologia de la raya guitarra Rhinobatos leucorhynchus (Günther, 1867) (Rajiformes: Rhinobatidae) en el Pacifico colombiano

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