Reproductive strategy of the Pacific cownose ray Rhinoptera steindachneri in the southern Gulf of California

Burgos-Vázquez, María Itzigueri; Chávez-García, Valeria E.; Cruz-Escalona, Víctor Hugo; Navia, Andrés F.; Mejía‐Falla, Paola A.

doi:10.1071/mf18096

Cited by 17 publications

(22 citation statements)

References 31 publications

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“…Myliobatiformes males, in general, have both testes functional, with little difference in size or mass, as observed for Rhinoptera steindachneri (Burgos-Vázquez et al, 2018), M. ridens and M. goodei (Araújo et al, 2016), Rhinoptera bonasus (Poulakis, 2013) and H. guttatus (Melo, 2016).…”

Section: Histology Of the Oviducal Glandmentioning

confidence: 63%

“…The males in this study showed no significant difference between the paired structures (testes and clasper glands). Both sides of the reproductive tract of A. narinari males were functional, with the greatest observed value for L C being 184 mm, for L CG 69 mm and for M TE 155 g. Myliobatiformes males, in general, have both testes functional, with little difference in size or mass, as observed for Rhinoptera steindachneri (Burgos‐Vázquez et al ., 2018), M. ridens and M. goodei (Araújo et al ., 2016), Rhinoptera bonasus (Poulakis, 2013) and H. guttatus (Melo, 2016).…”

Section: Discussionmentioning

confidence: 99%

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Reproductive biology of the whitespotted eagle ray Aetobatus narinari (Myliobatiformes) captured in the coast of Paraíba and Pernambuco, Brazil

Araújo

Oddone

Evêncio-Neto

et al. 2022

Journal of Fish Biology

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The present study analysed aspects of reproductive biology based on macroscopic and microscopic structures of whitespotted eagle ray Aetobatus narinari captured by artisanal fishing off the coast of Paraíba and Pernambuco (7° 30′ S, 34° 49′ W; 7° 47′ S, 34° 51′ W), northeast Brazil. Of the 71 individuals in the sample, 55% were female (disc width – WD: 532–1698 mm) and 45% were male (WD: 442–1410 mm). The body size at which 50% of the individuals are mature (WD50) for males was 1155.8 mm; the clasper length varied between 24 and 184 mm. The WD50 for females was 1293.9 mm; the diameter of the largest vitellogenic follicle varied between 11 and 31 mm; and only the left ovary and uterus were functional. The microanatomy of the reproductive tract of males and females agrees with that of other elasmobranch species. In males, the highest hepato‐somatic index (IH) average and gonado‐somatic index (IG) average occurred in the third bimester of the year, whereas in females the highest values (average IH and IG, respectively) were in the second bimester of the year. Based on the information on reproduction of A. narinari from this study, it will be possible to contribute to the correct management and protection of this species.

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Section: Histology Of the Oviducal Glandmentioning

confidence: 63%

Section: Discussionmentioning

confidence: 99%

Reproductive biology of the whitespotted eagle ray Aetobatus narinari (Myliobatiformes) captured in the coast of Paraíba and Pernambuco, Brazil

Araújo

Oddone

Evêncio-Neto

et al. 2022

Journal of Fish Biology

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“…However, this free‐living report should be considered doubtful. Recent biological information available for this species off the northwestern coast of Mexico confirms a birth size range between 381 to 420 mm DW (Burgos‐Vázquez et al., 2019; Ehemann et al., 2019) compared with the ≈200 mm DW abnormal specimen, meaning that the latter corresponded to a fully developed embryo. Although capture‐induced parturition has not yet been confirmed for this species (Adams et al., 2018), this scenario is also plausible to be considered for the abnormal Mexican cownose ray.…”

Section: Discussionmentioning

confidence: 88%

Morphological abnormalities in seven American round ray specimens: A review of America's batomorph anomalies

Ehemann¹,

García‐Rodríguez²,

Cruz‐Agüero³

2021

Journal of Fish Diseases

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Although morphological abnormalities in several rays and skate species around the American continents have frequently mentioned, their numbers are unknown. The present work record morphological abnormalities in four Urotrygonidae species. Two anophthalmic specimens were detected (Urotrygon microphthalmum and Urobatis halleri). Two individuals lacked caudal fins (Urobatis maculatus and Urotrygon chilensis). Two round rays showed incomplete fusion of the pectoral fin to the head (U. microphthalmum and U. chilensis). Vertebral compression and fusion were found in a 6‐year‐old female Urotrygon rogersi. In addition, 118 abnormal batomorph specimens were gathered from the available bibliography, spanning the last six decades (1959–2021). Amblyraja doellojuradoi was the species with the highest number of abnormalities (18). The most common anomaly was an incomplete fusion of the pectoral fin with the head. Since 2010, at least 30 anomalous batomorphs have been recorded every 5 years. Sixty‐nine abnormal specimens occurred in the Northern Hemisphere (1.00–60.00 N). The Cortezian (Pacific) and Southeastern Brazil (Atlantic) marine ecoregions stood out with the highest number of these specimens. Mexico recorded 58 anomalous specimens, followed by Brazil (n = 36). Biological, abiotic and anthropogenic factors are probably the leading causes. However, additional studies are necessary to elucidate these speculations.

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“…The OG has the same basic organization in most studied elasmobranchs, but the reproductive relevance of each glandular region varies (Hamlett et al ., 1998, 2005). Only the Narcinidae (electric rays, Torpediniformes) lack the OG (Prasad, 1945), and some species of Myliobatiformes have a vestigial OG (Burgos‐Vázquez et al ., 2018; Colonello et al ., 2013). Conversely, oviparous species have the largest OGs among chondrichthyans, since they produce not only the jellies that envelop the egg, but also an external capsule and all its ornamentations (Hamlett et al ., 2005; Serra‐Pereira et al ., 2010).…”

Section: Discussionmentioning

confidence: 99%

Glycan expression as a tool for a deeper understanding of a reproductive gland in a skate of economic importance

Moya

Acuña

Andrade

et al. 2020

Journal of Fish Biology

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Atlantoraja platana is an oviparous skate endemic to the south‐west Atlantic Ocean, and is one of the skate species most exploited by local industrial bottom trawl fisheries. Oviparous elasmobranchs encapsulate their eggs in complex egg cases produced by the oviductal gland (OG). This organ is exclusively present in these fishes and comprises four distinct zones: club, baffle, papillary and terminal. The relative size and structural complexity of these zones correlate with mode of reproduction. Glycans are known to play major roles in reproduction so their distribution in each zone of the OG could explain the functional multiplicity of the gland in skates, but this topic has not been previously investigated. In this study, morphological, histochemical and lectin‐histochemical analysis revealed various novel aspects of A. platana's OG. The club, papillary and terminal zones positively stained for periodic acid Schiff's reagent (PAS) and Alcian Blue (AB), indicating the presence of neutral and acid mucopolysaccharides. However, the buffle zone was negative for PAS and AB stains, but was positive for all the lectins used. Each zone of the OG had a characteristic pattern of glycan expression. Finally, we confirmed the presence of sperm but not sperm storage. This is the first lectin‐histochemical study of the OG in chondrichtyan fish and it has proven to be an important tool to understand some of the mechanisms of fertility and reproductive success in economic important species such as A. platana.

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Reproductive strategy of the Pacific cownose ray Rhinoptera steindachneri in the southern Gulf of California

Cited by 17 publications

References 31 publications

Reproductive biology of the whitespotted eagle ray Aetobatus narinari (Myliobatiformes) captured in the coast of Paraíba and Pernambuco, Brazil

Reproductive biology of the whitespotted eagle ray Aetobatus narinari (Myliobatiformes) captured in the coast of Paraíba and Pernambuco, Brazil

Morphological abnormalities in seven American round ray specimens: A review of America's batomorph anomalies

Glycan expression as a tool for a deeper understanding of a reproductive gland in a skate of economic importance

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