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Histological analysis of gonadal development in Patagonotothen tessellata (Richardson 1845) (Nototheniidae: Pisces) from the Beagle Channel, Argentina

Histological analysis of gonadal development in Patagonotothen tessellata (Richardson 1845)... Histological analysis of gonadal development in Patagonotothen tessellata (Richardson 1845) was carried out over a 3‐year period (1987–1989) on samples from the Beagle Channel, Tierra del Fuego, Argentina. Testicular structure is defined as of the ‘unrestricted spermatogonial type’. Maturation processes of cysts are synchronized in the various tubules. This degree of synchronization, as well as the characteristic of the different cellular types, permits definition of four spermatogenetic stages. Patagonotothen tessellata is defined as a total spawner according to ovocitary development and oocyte diameter frequency distribution analyses. Oocyte reabsorption and the likely consequences thereof on reproductive potential are also analysed. Patagonotothen tessellata is the first species of Nototheniids for which annual double spawning (winter and summer) and nonbiennial gonadal maturation processes are described. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Histological analysis of gonadal development in Patagonotothen tessellata (Richardson 1845) (Nototheniidae: Pisces) from the Beagle Channel, Argentina

Journal of Applied Ichthyology , Volume 12 (1) – May 1, 1996

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Publisher
Wiley
Copyright
Copyright © 1996 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1111/j.1439-0426.1996.tb00056.x
Publisher site
See Article on Publisher Site

Abstract

Histological analysis of gonadal development in Patagonotothen tessellata (Richardson 1845) was carried out over a 3‐year period (1987–1989) on samples from the Beagle Channel, Tierra del Fuego, Argentina. Testicular structure is defined as of the ‘unrestricted spermatogonial type’. Maturation processes of cysts are synchronized in the various tubules. This degree of synchronization, as well as the characteristic of the different cellular types, permits definition of four spermatogenetic stages. Patagonotothen tessellata is defined as a total spawner according to ovocitary development and oocyte diameter frequency distribution analyses. Oocyte reabsorption and the likely consequences thereof on reproductive potential are also analysed. Patagonotothen tessellata is the first species of Nototheniids for which annual double spawning (winter and summer) and nonbiennial gonadal maturation processes are described.

Journal

Journal of Applied IchthyologyWiley

Published: May 1, 1996

References