scholarly journals Early gonadogenesis in mammals: Significance of long and narrow gonadal structure

2012 ◽  
Vol 242 (4) ◽  
pp. 330-338 ◽  
Author(s):  
Kyoko Harikae ◽  
Kento Miura ◽  
Yoshiakira Kanai
Keyword(s):  
Gonadal Structure

scholarly journals Gonadal structure of the serial-sex changing gobiid fish Trimma okinawae

2005 ◽  
Vol 47 (1) ◽  
pp. 7-13 ◽  
Author(s):  
Yasuhisa Kobayashi ◽  
Tomoki Sunobe ◽  
Tohru Kobayashi ◽  
Yoshitaka Nagahama ◽  
Masaru Nakamura
Keyword(s):  
Gobiid Fish ◽  
Gonadal Structure

scholarly journals Ultrasound evaluation of the gonadal structure in sex-reversed rainbow trout females

2013 ◽  
Vol 22 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Piotr Hliwa ◽  
Mamadou Bah ◽  
Henryk Kuźmiński ◽  
Stefan Dobosz ◽  
Andrzej Ciereszko
Keyword(s):  
Rainbow Trout ◽  
Ultrasound Evaluation ◽  
Gonadal Structure

Reproductive characteristics of Calyptogena gallardoi (Bivalvia: Vesicomyidae) from a methane seep area off Concepción, Chile

2009 ◽  
Vol 89 (1) ◽  
pp. 161-169 ◽  
Author(s):  
Macarena Parra ◽  
Javier Sellanes ◽  
Enrique Dupré ◽  
Elena Krylova
Keyword(s):  
Seminal Receptacle ◽  
Average Length ◽  
Average Diameter ◽  
Mature Oocyte ◽  
Dorsal Margin ◽  
Methane Seep ◽  
Genital Opening ◽  
Males And Females ◽  
Available Information ◽  
Gonadal Structure

Calyptogena gallardoi is a vesicomyid bivalve inhabiting a methane seep area located at a depth of 740–870 m off the Bay of Concepción, Chile. Vesicomyids host chemoautotrophic sulphide-oxidizing endosymbiont bacteria and are always found associated to reducing environments. In this study, the gonadal structure and the gametes produced by C. gallardoi are described. Light microscopy is used to examine serial histological sections of the gonads, and scanning electron microscopy is used to visualize the external morphology of gametes. The gonads of both males and females are organized in ramified tubular acini. In males, mature sperm are stored near genital openings in acini lined with a secretor epithelium that resembles a seminal receptacle. Spermatozoids have bullet-like heads with an average length of 30.3±2.6 μm (mean±1 SD). In females, the mature oocytes are driven toward the genital opening through evacuator conduits lined by ‘paddle’ cilia. The average diameter of oogonias is 11.6±2.5 μm and that of mature oocytes is 273.8±23.1 μm, making the size of the mature oocyte among the largest reported for bivalves. In addition, C. gallardoi is shown to have external sexual dimorphism. Shells of males are significantly smaller and more elongated with sloping postero-dorsal margin compared with shells of females. The data are discussed in the context of available information on reproductive biology of vesicomyids.

scholarly journals TURNER SYNDROME (TS): ULTRASONOGRAPHY (US) DEFINES RENAL ANOMALIES AND GONADAL STRUCTURE

1984 ◽  
Vol 18 ◽  
pp. 171A-171A
Author(s):  
Barbara M Lippe ◽  
Hooshang Kangarloo ◽  
Soloman A Kaplan ◽  
Mitchell E Geffer
Keyword(s):  
Turner Syndrome ◽  
Renal Anomalies ◽  
Gonadal Structure

Gonadal structure and gametogenesis inScyllarus ardus(L.) (Crustacea, Decapoda)

1988 ◽  
Vol 55 (1-4) ◽  
pp. 299-306 ◽  
Author(s):  
Angelo Cau ◽  
Mario Alberto Davini ◽  
Anna Maria Deiana ◽  
Susanna Salvadori
Keyword(s):  
Gonadal Structure

Effects of estradiol-17β on survival, growth performance, sex reversal and gonadal structure of bluegill sunfish Lepomis macrochirus

Aquaculture ◽  
2008 ◽  
Vol 285 (1-4) ◽  
pp. 216-223 ◽  
Author(s):  
Han-Ping Wang ◽  
Zexia Gao ◽  
Beatrix Beres ◽  
Joseph Ottobre ◽  
Geoff Wallat ◽  
...  
Keyword(s):  
Growth Performance ◽  
Lepomis Macrochirus ◽  
Sex Reversal ◽  
Bluegill Sunfish ◽  
Estradiol 17Β ◽  
Gonadal Structure

Effects of 17α-Methyltestosterone and Aromatase Inhibitor Letrozole on Sex Reversal, Gonadal Structure, and Growth in Yellow CatfishPelteobagrus fulvidraco

2015 ◽  
Vol 228 (2) ◽  
pp. 108-117 ◽  
Author(s):  
Zhi-Gang Shen ◽  
Qi-Xue Fan ◽  
Wei Yang ◽  
Yun-Long Zhang ◽  
Han-Ping Wang
Keyword(s):  
Aromatase Inhibitor ◽  
Sex Reversal ◽  
Gonadal Structure
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