Structure and cytology of the testes of Labeo victorianus (Pisces: Cyprinidae)

Rutaisire, Justice; Muwazi, Ruth T; Booth, Anthony J

Title: Structure and cytology of the testes of Labeo victorianus (Pisces: Cyprinidae)
Creator: Rutaisire, Justice
Creator: Muwazi, Ruth T
Creator: Booth, Anthony J
Subject: To be catalogued
Date Issued: 2003
Date: 2003
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/446798
Identifier: vital:74561
Identifier: https://doi.org/10.1080/15627020.2003.11657199
Description: Testes macromorphology and histomorphology together with sperm cytology are described for a potamodrometic cyprinid fish, Labeo victorianus, from Lake Victoria. Testes were found to be paired and elongate, suspended by a mesorchium on either side of the swim bladder. A sperm duct ran along the medial surface of each testis before fusing caudally to form the common sperm duct that terminated at the urogenital pore. Main sperm ducts were lined by simple columnar epithelium supported by a wall with elastic connective tissue and a few smooth muscle cells. The tunica albuginea divided the testes into lobules, which contained spermatogenetic cell types. The lobules, released spermatozoa into an anastomosing tubule network that emptied directly into the main sperm duct. Valve like structures were present along the length of the sperm duct and are proposed to regulate milt flow. Three types of somatic cells were observed at the onset of gonadal recrudescence; plasma and intralobular somatic cells were within the lobules, while Leydig cells were close to the blood vessels in the interstitium. Maturing testes were characterized by the dominance of spermatocytes and spermatids, both contained in cysts. Spermatozoa, arising from the spermatids, filled the lobular lumen in mature testes after spermatocyst rupture. In post spawned testes, Type A spermatogonia dominated. Testicular regression was not characterized by spermatozoa phagocytosis, rather via apoptosis.
Format: 8 pages
Format: pdf
Language: English
Relation: African Zoology
Relation: Rutaisire, J., Muwazi, R.T. and Booth, A.J., 2003. Structure and cytology of the testes of Labeo victorianus (Pisces: Cyprinidae). African Zoology, 38(1), pp.119-126
Relation: African Zoology volume 38 number 1 119 126 2003 2224-073X
Rights: Publisher
Rights: Use of this resource is governed by the terms and conditions of the Taylor and Francis Online Terms and Conditions Statement (https://www.tandfonline.com/terms-and-conditions)

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