Publication: Fine structure of spermatozoa in the gilthead sea bream (Sparus aurata Linnaeus, 1758) (Perciformes, Sparidae)
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Date
2007
Authors
Maricchiolo, G. ; Genovese, L. ; Laurà, R. ; Micale, V. ; Muglia, U.
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Publisher
Murcia : F. Hernández
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DOI
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info:eu-repo/semantics/article
Description
Abstract
Scanning and transmission electron
microscopy were used to investigate the fine structure of
the sperm of the sparid fish Sparus aurata L. The mature
spermatozoon of gilthead sea bream belongs, like that of
the other sparid fish, to a “type I” as defined by Mattei
(1970). It has a spherical head which lacks an acrosome,
a short, irregularly-shaped midpiece and a long
cylindrical tail. The nucleus reveals a deep invagination
(nuclear fossa) in which the centriolar complex is
located. The two centrioles are approximately
perpendicular to each other and show a conventional
“9+0” pattern. The proximal centriole is associated with
a cross-striated cylindrical body lying inside a peculiar
satellite nuclear notch which appears as a narrow
invagination of the nuclear fossa. The distal centriole is
attached to the nuclear envelope by means of a lateral
plate and radial fibres made of an electron-dense
material. The short midpiece houses one mitochondrion.
The flagellum is inserted perpendicularly into the base of
the nucleus and contains the conventional 9+2 axoneme.
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