Morphological analysis and description of the ovaries of female silky sharks, Carcharhinus falciformis (Müller & Henle, 1839)

Rego, Mariana G.; Hazin, Fábio H. V.; Evencio Neto, Joaquim; Oliveira, P. G. V.; Soares, Maria Goretti; Torres, Keilla Regina L. S.; Lana, Fernanda O.; Roque, Pollyana C. G.; Santos, Natalia L.; Coelho, Rui

Publication

Morphological analysis and description of the ovaries of female silky sharks, Carcharhinus falciformis (Müller & Henle, 1839)

2013Journal article

dc.contributor.author	Rego, Mariana G.
dc.contributor.author	Hazin, Fábio H. V.
dc.contributor.author	Evencio Neto, Joaquim
dc.contributor.author	Oliveira, P. G. V.
dc.contributor.author	Soares, Maria Goretti
dc.contributor.author	Torres, Keilla Regina L. S.
dc.contributor.author	Lana, Fernanda O.
dc.contributor.author	Roque, Pollyana C. G.
dc.contributor.author	Santos, Natalia L.
dc.contributor.author	Coelho, Rui
dc.date.accessioned	2017-03-14T10:40:26Z
dc.date.available	2017-03-14T10:40:26Z
dc.date.issued	2013
dc.description.abstract	This work aims to study the female reproductive tract of silky sharks, Carcharhinus falciformis, captured in the South and Equatorial Atlantic Ocean. Samples were collected between January 2008 and March 2010 through oceanic commercial vessels that targeted tuna and swordfish, with a total of 17 females collected. The methodologies followed for analyzing the ovaries of those females included both macroscopic and histological analysis. Macroscopically, it was possible to determine that the ovaries on these sharks is suspended by mesenteries in the anterior section of the body cavity, heavily irrigated by blood vessels, and contains a wide range of oocytes. Ovaries were found in three distinct maturational stages: Stage I (Immature), Stage II (Maturing) and Stage III (Mature). Immature ovaries were small, with widths ranging from 1.0 to 3.1 cm, and had a gelatinous or granulose internal structure; maturing ovaries were slightly larger, ranging in width between 5.2 and 6.0 cm; mature ovaries ranged in width between 6.5 and 7.8 cm, and had a more rounded shape and the presence of large and well developed oocytes. Under microscopic examination, it was observed that the ovaries were covered with simple epithelial tissue during the early development stages and a simple cubic epithelium in the final stages of maturation. During the initial maturation stages the epigonal organ was not differentiated from the ovary. In mature specimens, the ovary showed a simple cubic epithelium and just below this epithelium there was a layer of dense connective tissue and muscle with the presence of vitellogenic oocytes and fat cells. A thin yolk membrane enclosing the oocytes was also evident. Finally, it was possible to distinguish a zona pellucida, separating the oocytes from the follicle wall and a basal lamina between the granular layers and the teak layer.	pt_PT
dc.description.version	info:eu-repo/semantics/publishedVersion	pt_PT
dc.identifier.doi	10.1590/S1679-62252013000400009	pt_PT
dc.identifier.issn	1679-6225
dc.identifier.other	AUT: RMS01092;
dc.identifier.uri	http://hdl.handle.net/10400.1/9044
dc.language.iso	eng	pt_PT
dc.peerreviewed	yes	pt_PT
dc.publisher	Sociedade Brasileira de Ictiologia	pt_PT
dc.rights.uri	http://creativecommons.org/licenses/by/4.0/	pt_PT
dc.subject	Elasmobranchs	pt_PT
dc.subject	Histology	pt_PT
dc.subject	Maturity	pt_PT
dc.subject	Ovary	pt_PT
dc.subject	Reproduction	pt_PT
dc.title	Morphological analysis and description of the ovaries of female silky sharks, Carcharhinus falciformis (Müller & Henle, 1839)	pt_PT
dc.type	journal article
dspace.entity.type	Publication
oaire.citation.endPage	819	pt_PT
oaire.citation.issue	4	pt_PT
oaire.citation.startPage	815	pt_PT
oaire.citation.title	Neotropical Ichthyology	pt_PT
oaire.citation.volume	11	pt_PT
person.familyName	Coelho
person.givenName	Rui
person.identifier	134638
person.identifier.ciencia-id	DC1A-20B7-EAC0
person.identifier.orcid	0000-0003-3813-5157
person.identifier.rid	C-1163-2008
person.identifier.scopus-author-id	56257111100
rcaap.rights	openAccess	pt_PT
rcaap.type	article	pt_PT
relation.isAuthorOfPublication	6366aa1b-1301-43a3-b2b0-1280311ac95f
relation.isAuthorOfPublication.latestForDiscovery	6366aa1b-1301-43a3-b2b0-1280311ac95f