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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Ultrastructural analysis of spermiogenesis in the neotropical cichlid Cichla kelberi Kullander & Ferreira, 2006 (Perciformes: Cichlidae)

Texto completo
Autor(es):
de Siqueira-Silva, D. H. [1, 2] ; da Silva Costa, R. [1, 2] ; Ninhaus-Silveira, A. [1] ; Vicentini, C. A. [3] ; Verissimo-Silveira, R. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Estadual Paulista, UNESP, Dept Biol & Zootecnia, Lab Ictiol Neotrop, LINEO, BR-15385000 Sao Paulo - Brazil
[2] Univ Estadual Paulista, UNESP, Programa Posgrad Biol Anim, BR-15385000 Sao Paulo - Brazil
[3] Univ Estadual Paulista, UNESP, Dept Ciencias Biol, LAMOA, Lab Morfol Organismos Aquat, BR-15385000 Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Journal of Applied Ichthyology; v. 28, n. 6, SI, p. 878-882, DEC 2012.
Citações Web of Science: 0
Resumo

In the Neotropical cichlid Cichla kelberi the spermiogenesis appears to be of the cystic type and is characterized by gradual chromatin condensation in juxtaposed clusters, nuclear rotation (with the flagellum perpendicularly to the nucleus), and consequent nuclear fossa formation. Besides, there is cytoplasma migration to the nuclear base while eliminating the cytoplasmic residual mass. The heads of the spermatozoa are round, with approximately 1.87 mu m in diameter; the nucleus has clusters juxtaposed of condensed chromatin. The nuclear fossa in single arc shape is moderate and slightly eccentric to the nuclear base. The midpiece is short and presents a cytoplasmic sheath, which dilated in its extremes. The mitochondria are spherical or slightly elongated. The flagellum presents the classical axoneme 9 + 2 and one pair of fins. The Type I C. kelberi spermatozoon has its flagellum perpendicularly positioned in relation to the nucleus base. The presence of only one flagellum characterize it as the basic spermatozoon in teleost, known as single anacrosomal aquasperm spermatozoon. Besides the patterns of previously cited characteristics between its representatives, the cytoplasmic sheath and flagellum fins presence can be consider as characteristics of the Cichla genus. (AU)

Processo FAPESP: 09/02891-4 - Ciclo reprodutivo e análise ultraestrutural da espermatogênese de Cichla kelberi (Teleostei, Perciformes, Cichlidae)
Beneficiário:Diógenes Henrique de Siqueira Silva
Linha de fomento: Bolsas no Brasil - Mestrado
Processo FAPESP: 10/00988-8 - Utilização da hipófise de Geophagus proximus, proveniente da pesca profissional, na reprodução induzida de Prochilodus lineatus
Beneficiário:Rosicleire Veríssimo Silveira
Linha de fomento: Auxílio à Pesquisa - Regular