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Histological analysis of gonadal development in Patagonotothen tessellata (Richardson 1845) (Nototheniidae: Pisces) from the Beagle Channel, Argentina
Author(s) -
Rae G. A.,
Calvo J.
Publication year - 1996
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.1996.tb00056.x
Subject(s) - biology , beagle , oocyte , zoology , development of the gonads , ecology , anatomy , fishery , gonad , embryo
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.