Vol. 41 No. 4, 2002
Gonadal Structure and Gametogenesis of Trigla lyra (Pisces: Triglidae)
Marta Muņoz*, Maria Sābat, Sandra Mallol and Margarida Casadevall
Biologia Animal, Departament Cičncies Ambientals, Universitat de Girona, Campus de Montilivi, Girona 17071, Spain
Marta Muņoz, Maria Sābat, Sandra Mallol and Margarida Casadevall (2002) The gonadal structure and development stages of germ cells of Trigla lyra
are described for both sexes. The ovigerous lamellae of the saccular
cystovarian ovaries spread from the periphery to the center of the
gonad where the lumen is located. In addition to the postovulatory
follicles and atretic oocytes, seven stages of development are
described based on the histological and ultrastructural characteristics
of the oocytes. Gonadal development is of the “synchronous group” type.
This kind of development and the presence of postovulatory follicles in
ovaries which still contain developing vitellogenic oocytes suggest
that T. lyra spawns on
multiple occasions over a relatively prolonged period of time. Drops of
oil in the mature oocyte indicate that spawning is pelagic. The testes
are lobular and of the “unrestricted spermatogonial” type. Male germ
cells are divided into 8 stages that were principally analyzed by means
of transmission electron microscopy. The morphological characteristics
of the spermatozoon, as a short head and a barely differentiated middle
piece with few mitochondria, indicate external fertilization.
Key words: Reproduction, Gametogenesis, Morphology, Ultrastructure, Triglidae.
*Correspondence: Tel: 972-418498. Fax: 972-418150. E-mail: marta. firstname.lastname@example.org