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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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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]
Total Authors: 5
[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
Total Affiliations: 3
Document type: Journal article
Source: Journal of Applied Ichthyology; v. 28, n. 6, SI, p. 878-882, DEC 2012.
Web of Science Citations: 0

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)

FAPESP's process: 09/02891-4 - Reproductive cycle and ultraestructural study of spermatogenesis in Cichla kelberi (Teleostei, Perciformes, Cichlidae)
Grantee:Diógenes Henrique de Siqueira Silva
Support type: Scholarships in Brazil - Master
FAPESP's process: 10/00988-8 - Use of the pituitary of Geophagus proximus, proceeding from fisheries professional, in the induced reproduction of Prochilodus lineatus
Grantee:Rosicleire Veríssimo Silveira
Support type: Regular Research Grants