Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters

Specimens of Atlantoraja castelnaui were obtained from seven commercial fishing vessels operating in southeastern Brazilian waters, from March 2005 to April 2006. A total of 53 males, ranging from 17.9 to 111.0 cm in total length (TL), were examined. Based on analyses of the clasper gland and claspe...

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Autores principales:	Oddone,María C, Amorim,Alberto F, Mancini,Patricia L
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2008
Materias:	Egg-bearing females elasmobranchs size at maturity vitellogenic follicle clasper
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000200010
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spelling	oai:scielo:S0718-195720080002000102009-01-27Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian watersOddone,María CAmorim,Alberto FMancini,Patricia L Egg-bearing females elasmobranchs size at maturity vitellogenic follicle clasper Specimens of Atlantoraja castelnaui were obtained from seven commercial fishing vessels operating in southeastern Brazilian waters, from March 2005 to April 2006. A total of 53 males, ranging from 17.9 to 111.0 cm in total length (TL), were examined. Based on analyses of the clasper gland and clasper length, testes weight, testicular lobes diameter and alar thorns, size at maturity was estimated to be 91.0 cm TL. Fifty-four females were examined ranging from 17.4 to 116.0 cm TL. According to observations of uterus width, oviducal gland width, ovary weight and diameter of the largest vitellogenic follicle, size at maturity was estimated as 105.0 cm TL. Vitellogenesis would start when follicles attain a diameter of 1.0 cm, and ovulation when attaining 3.0 cm of diameter. The maximum number of vitellogenic follicles of this species was 20. In spite of the fact that A. castelnaui is an oviparous species, and therefore, with a relatively high fecundity when compared with other elasmobranchs, its big size makes it an extremely vulnerable species to fishery pressure, being even already considered as an endangered one. Because of that, the knowledge of its reproductive parameters will lead to an adequate management of the stocks.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.43 n.2 20082008-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000200010en10.4067/S0718-19572008000200010
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Egg-bearing females elasmobranchs size at maturity vitellogenic follicle clasper
spellingShingle	Egg-bearing females elasmobranchs size at maturity vitellogenic follicle clasper Oddone,María C Amorim,Alberto F Mancini,Patricia L Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters
description	Specimens of Atlantoraja castelnaui were obtained from seven commercial fishing vessels operating in southeastern Brazilian waters, from March 2005 to April 2006. A total of 53 males, ranging from 17.9 to 111.0 cm in total length (TL), were examined. Based on analyses of the clasper gland and clasper length, testes weight, testicular lobes diameter and alar thorns, size at maturity was estimated to be 91.0 cm TL. Fifty-four females were examined ranging from 17.4 to 116.0 cm TL. According to observations of uterus width, oviducal gland width, ovary weight and diameter of the largest vitellogenic follicle, size at maturity was estimated as 105.0 cm TL. Vitellogenesis would start when follicles attain a diameter of 1.0 cm, and ovulation when attaining 3.0 cm of diameter. The maximum number of vitellogenic follicles of this species was 20. In spite of the fact that A. castelnaui is an oviparous species, and therefore, with a relatively high fecundity when compared with other elasmobranchs, its big size makes it an extremely vulnerable species to fishery pressure, being even already considered as an endangered one. Because of that, the knowledge of its reproductive parameters will lead to an adequate management of the stocks.
author	Oddone,María C Amorim,Alberto F Mancini,Patricia L
author_facet	Oddone,María C Amorim,Alberto F Mancini,Patricia L
author_sort	Oddone,María C
title	Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters
title_short	Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters
title_full	Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters
title_fullStr	Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters
title_full_unstemmed	Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters
title_sort	reproductive biology of the spotback skate, atlantoraja castelnaui (ribeiro, 1907) (chondrichthyes, rajidae), in southeastern brazilian waters
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572008000200010
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Reproductive biology of the spotback skate, Atlantoraja castelnaui (Ribeiro, 1907) (Chondrichthyes, Rajidae), in southeastern Brazilian waters

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