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| Rangel,Bianca S.; Bruno,Carlos E. Malavasi; Salmon,Thierry; Ciena,Adriano P.; Miglino,Maria A.; Amorim,Alberto F.; Rici,Rose E. G.. |
| ABSTRACT Oviducal gland present in elasmobranchs is correlated to the organism's reproductive strategy, and its functions are to produce mucus, to form the egg's tertiary envelope and to store sperm. The gland contains four zones: club, papillary,baffle and terminal. The structures of the oviduct, oviducal gland and isthmus of blue shark Prionace glauca were described using macroscopic, light microscopy and scanning electron microscopy techniques. The epithelium of the oviduct and isthmus is folded and is a simple, columnar, ciliated lining epithelium with glandular cells. In the oviducal gland, the lining tissues in the four zones are similar to the oviduct and isthmus lining. The terminal zone shows the presence of sperm in the lumen of the secretory... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cartilaginous fish; Electron microscopy; Nidamental gland; Reproduction; Shell gland. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252015000400663 |
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| Rangel,Bianca S.; Rodrigues,Alexandre; Moreira,Renata G.. |
| ABSTRACT Using non-lethal methods for data collection of individuals and participatory monitoring by fishermen, we provide the first empirical evidence of the use of a nursery area by neonate and young-of-the-year cownose rays Rhinoptera bonasus and R. brasiliensis in southeastern Brazil. Two methods were used to collect data: (1) information provided by fishermen (reports, pictures, and videos) and (2) field sampling by researchers. A total of 746 cownose rays were captured; 113 have been identified as R. bonasus, 15 as R. brasiliensis, and 618 were reported by fishermen and could not be identified to the species. Records of newborns were made only in late spring and summer in 2015, 2016, and 2017, which suggests an annual reproductive cycle, with birth... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Early life-history; Neonates; Newborn; Non-lethal; Young of the year. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100213 |
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