Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil
Main Author: | |
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Publication Date: | 2008 |
Other Authors: | , , |
Format: | Article |
Language: | eng |
Source: | Repositório Institucional da UNESP |
Download full: | http://hdl.handle.net/11449/195915 |
Summary: | Specimens of Atlantoraja cyclophora were collected monthly from commercial fishing landings at Guaruja, Sao Paulo State, Brazil, from March 2005 to April 2006 at depths between 10 and 146 m. Males ranged from 13.3 to 58.5 cm TL (n = 396). Both the smallest mature male and the largest immature male were 47.0 cm long. Males' size-at-50% maturity was calculated to be 463 cm. Females ranged from 11.5 to 68.0 cm (n = 401). The smallest mature and the largest immature female were 51.6 and 53. 0 cm long respectively. For the females, size-at-50% maturity was calculated to be 53.2 cm. In the males the hepatosomatic and gonadosomatic indices varied between 0. 48 (August) and 3.54 (November) and between 0. 15 (November) and 1. 45 (June) respectively, with no significant variation for the fourteen-month period. In the females the hepatosomatic and gonadosomatic indices varied from 1. 55 and 6 30 3.54 (both for April 2006) and from 0. 08 (December) to 4.41 (October) respectively, with no significant difference among months. Egg-bearing females were found in all months with proportions varying from 0. 03 (March) to 0. 67 (April). Both males and females undergo an annual cycle, with slight seasonal variations in reproductive activity and a peak in the proportion of egg bearing females between April and July. |
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Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazilclasperelasmobranchsfolliclesegg-bearinggonadsreproductionsexual resting periodSpecimens of Atlantoraja cyclophora were collected monthly from commercial fishing landings at Guaruja, Sao Paulo State, Brazil, from March 2005 to April 2006 at depths between 10 and 146 m. Males ranged from 13.3 to 58.5 cm TL (n = 396). Both the smallest mature male and the largest immature male were 47.0 cm long. Males' size-at-50% maturity was calculated to be 463 cm. Females ranged from 11.5 to 68.0 cm (n = 401). The smallest mature and the largest immature female were 51.6 and 53. 0 cm long respectively. For the females, size-at-50% maturity was calculated to be 53.2 cm. In the males the hepatosomatic and gonadosomatic indices varied between 0. 48 (August) and 3.54 (November) and between 0. 15 (November) and 1. 45 (June) respectively, with no significant variation for the fourteen-month period. In the females the hepatosomatic and gonadosomatic indices varied from 1. 55 and 6 30 3.54 (both for April 2006) and from 0. 08 (December) to 4.41 (October) respectively, with no significant difference among months. Egg-bearing females were found in all months with proportions varying from 0. 03 (March) to 0. 67 (April). Both males and females undergo an annual cycle, with slight seasonal variations in reproductive activity and a peak in the proportion of egg bearing females between April and July.Inst Pesca, BR-11030906 Santos, SP, BrazilUniv Estadual Paulista, Dept Ecol, BR-13506900 Rio Claro, SP, BrazilDireccion Nacl Rec Acuat, Dept Biol Pesquera, Montevideo 11200, UruguayCEPSUL, BR-88301700 Itajai, SC, BrazilUniv Estadual Paulista, Dept Ecol, BR-13506900 Rio Claro, SP, BrazilInst Oceanografiju I RibarstvoInst PescaUniversidade Estadual Paulista (Unesp)Direccion Nacl Rec AcuatCEPSULOddone, Maria Cristina [UNESP]Norbis, WalterMancini, Patricia L.Amorim, Alberto F.2020-12-10T18:09:04Z2020-12-10T18:09:04Z2008-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article73-87Acta Adriatica. Split: Inst Oceanografiju I Ribarstvo, v. 49, n. 1, p. 73-87, 2008.0001-5113http://hdl.handle.net/11449/195915WOS:000257944700009Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengActa Adriaticainfo:eu-repo/semantics/openAccess2021-10-22T12:58:32Zoai:repositorio.unesp.br:11449/195915Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:33:45.726165Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil |
title |
Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil |
spellingShingle |
Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil Oddone, Maria Cristina [UNESP] clasper elasmobranchs follicles egg-bearing gonads reproduction sexual resting period |
title_short |
Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil |
title_full |
Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil |
title_fullStr |
Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil |
title_full_unstemmed |
Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil |
title_sort |
Sexual development and reproductive cycle of the Eyespot skate Atlantoraja cyclophora (Regan, 1903) (Chondrichthyes : Rajidae : Arhynchobatinae), in southeastern Brazil |
author |
Oddone, Maria Cristina [UNESP] |
author_facet |
Oddone, Maria Cristina [UNESP] Norbis, Walter Mancini, Patricia L. Amorim, Alberto F. |
author_role |
author |
author2 |
Norbis, Walter Mancini, Patricia L. Amorim, Alberto F. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Inst Pesca Universidade Estadual Paulista (Unesp) Direccion Nacl Rec Acuat CEPSUL |
dc.contributor.author.fl_str_mv |
Oddone, Maria Cristina [UNESP] Norbis, Walter Mancini, Patricia L. Amorim, Alberto F. |
dc.subject.por.fl_str_mv |
clasper elasmobranchs follicles egg-bearing gonads reproduction sexual resting period |
topic |
clasper elasmobranchs follicles egg-bearing gonads reproduction sexual resting period |
description |
Specimens of Atlantoraja cyclophora were collected monthly from commercial fishing landings at Guaruja, Sao Paulo State, Brazil, from March 2005 to April 2006 at depths between 10 and 146 m. Males ranged from 13.3 to 58.5 cm TL (n = 396). Both the smallest mature male and the largest immature male were 47.0 cm long. Males' size-at-50% maturity was calculated to be 463 cm. Females ranged from 11.5 to 68.0 cm (n = 401). The smallest mature and the largest immature female were 51.6 and 53. 0 cm long respectively. For the females, size-at-50% maturity was calculated to be 53.2 cm. In the males the hepatosomatic and gonadosomatic indices varied between 0. 48 (August) and 3.54 (November) and between 0. 15 (November) and 1. 45 (June) respectively, with no significant variation for the fourteen-month period. In the females the hepatosomatic and gonadosomatic indices varied from 1. 55 and 6 30 3.54 (both for April 2006) and from 0. 08 (December) to 4.41 (October) respectively, with no significant difference among months. Egg-bearing females were found in all months with proportions varying from 0. 03 (March) to 0. 67 (April). Both males and females undergo an annual cycle, with slight seasonal variations in reproductive activity and a peak in the proportion of egg bearing females between April and July. |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-01-01 2020-12-10T18:09:04Z 2020-12-10T18:09:04Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
Acta Adriatica. Split: Inst Oceanografiju I Ribarstvo, v. 49, n. 1, p. 73-87, 2008. 0001-5113 http://hdl.handle.net/11449/195915 WOS:000257944700009 |
identifier_str_mv |
Acta Adriatica. Split: Inst Oceanografiju I Ribarstvo, v. 49, n. 1, p. 73-87, 2008. 0001-5113 WOS:000257944700009 |
url |
http://hdl.handle.net/11449/195915 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Acta Adriatica |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
73-87 |
dc.publisher.none.fl_str_mv |
Inst Oceanografiju I Ribarstvo |
publisher.none.fl_str_mv |
Inst Oceanografiju I Ribarstvo |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128233802039296 |