Annual Cycles of Steroid Hormone Production, Gonad Development, and Reproductive Behavior in the Atlantic Stingray

Tricas, Timothy C.; Maruska, Karen P.; Rasmussen, L.E.L.

doi:10.1006/gcen.2000.7466

Cited by 107 publications

(130 citation statements)

References 37 publications

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“…Results presented here show that the resumption of the developmental progression of mature spermatogonial cysts in the fall coincides in time and space with a corresponding increase in the number of mature spermatid cysts, findings which are also noted in other elasmobranchs (Garnier et al 1999, Tricas et al 2000. These findings in Squalus, to some extent, complement those of previous in vitro experiments on isolated spermatocysts.…”

Section: Discussionsupporting

confidence: 87%

See 1 more Smart Citation

Stage and season effects on cell cycle and apoptotic activities of germ cells and Sertoli cells during spermatogenesis in the spiny dogfish (Squalus acanthias)

McClusky¹

2005

Reproduction

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To understand the processes involved in the spatial and temporal maturation of testicular cells in Squalus acanthias, we used standard morphometry, proliferating-cell nuclear antigen (PCNA) and terminal deoxynucleotidyl transferase-mediated dUTP nick end-labelling (TUNEL) immunohistochemistry. Except for immature spermatocysts (germinal zone, GZ; early-stage premeiotic, E-PrM), the number of cysts in all subsequent stages and the total number of cysts in the spermatogenic progression varied seasonally. The spermatogenic cycle spans about 2 years and is interrupted by germcell clone deletion via apoptosis at the mitosis-meiosis transition in April/May, manifesting as a zone of degeneration (ZD). Rate of displacement of the ZD across the testis diameter indicates that late-stage premeiotic (L-PrM) generations 12-13 require 9 -10 months to reach the mature-spermatid stage. Also, the number of cysts completing spermatogenesis is approximately 4-5-fold less than the number that entered spermatogenesis proper 2 years earlier. Pronounced gonocytogenesis in the germinal ridge was coincident with ZD formation in April/May, but it was absent in the fall when mature spermatogonial and meiotic activities had resumed. Whereas strong Sertoli cell PCNA immunoreactivity dominated the GZ cyst cell-cycle activities throughout the year, except during the spring/summer months, the spermatogonial-and Sertoli-cell PCNA indices in E-PrM cysts were inversely related. PCNA immunoreactivity in spermatocytes was seasonal and dependent on the stage of meiosis. TUNEL labelling was limited to spermatogonia and increased stage-dependently in the PrM region (L-PrM 5 mid-stage PrM @ E-PrM @ GZ), correlating with ZD formation, in a season-dependent manner. Results imply that effects of normal regulatory factors in Squalus are stage-and process-specific.

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Section: Discussionsupporting

confidence: 87%

“…Since sea temperature is clearly implicated in the waxing and waning of testicular activities of other elasmobranchs (Garnier et al 1999, Tricas et al 2000, further studies are required to establish whether environmental cues also have a role in cell-proliferative and cell-death activities during spermatogenesis in the spiny dogfish shark.…”

mentioning

confidence: 99%

Stage and season effects on cell cycle and apoptotic activities of germ cells and Sertoli cells during spermatogenesis in the spiny dogfish (Squalus acanthias)

McClusky¹

2005

Reproduction

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“…The organization of the spermatogenic lobules, which was histologically characterized in the cururu stingrays by their defined development zones, followed cell differentiation and changes in spermatocyst composition and diameter that were distributed in stages equivalent to the zones described for Himantura signifier (Chatchavalvanich et al, 2004) and Dasyatis sabina (Maruska et al, 1996;Tricas et al, 2000); and for other elasmobranchs such as Mustelus canis (Conrath & Musick, 2002), Centroscymnus coelolepis and Centrophorus squamosus (Girard et al, 2000) and Squalus acanthias (McClusky, 2005(McClusky, , 2006.…”

Section: Discussionmentioning

confidence: 99%

Testicular structure and spermatogenesis of Amazonian freshwater cururu stingray Potamotrygon cf. histrix

Zaiden

Brinn

Marcon³

et al. 2010

Zygote

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SummaryThe cururu stingray Potamotrygon cf. histrix, a new and endemic Amazonian freshwater species, presents appropriate characteristics for fish keeping and is exploited from its natural environment. The present study identified the testicular structure and spermatogenesis of this species. Gonads from adult male specimens were dissected, fixed and processed for histological analysis. The testes were of testicular/epigonial type. The presence of germinal papillae was observed in the upper portion of organ with primordial germ cells and Sertoli cell precursors. The testis was lobular with zonal organization and cystic gametogenesis, with the occurrence of spermatoblasts. The Sertoli cells underwent morphological modifications over the course of gamete formation. The spermatozoids had long heads and were spiraled on their own axis. Information on the reproductive biology will serve as basis for studies on the reproduction and phylogeny of this peculiar group of cartilaginous fish.

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“…Direct macroscopic measures of gonadal condition in sacrificed draughtboard sharks were correlated with plasma levels of the reproductive hormones testosterone (T), 17β-estradiol (E 2 ) and progesterone (P 4 ). T, E 2 and P 4 were chosen as likely indices of maturity based on the strong correlation between these hormones and reproductive activity in a number of chondrichthyan species (Manire et al 1995, Koob & Callard 1999, Tricas et al 2000.…”

Section: Introductionmentioning

confidence: 99%

Non-lethal assessment of reproductive characteristics for management and conservation of sharks

Awruch¹,

Frusher²,

Pankhurst³

et al. 2008

Mar. Ecol. Prog. Ser.

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Annual Cycles of Steroid Hormone Production, Gonad Development, and Reproductive Behavior in the Atlantic Stingray

Cited by 107 publications

References 37 publications

Stage and season effects on cell cycle and apoptotic activities of germ cells and Sertoli cells during spermatogenesis in the spiny dogfish (Squalus acanthias)

Stage and season effects on cell cycle and apoptotic activities of germ cells and Sertoli cells during spermatogenesis in the spiny dogfish (Squalus acanthias)

Testicular structure and spermatogenesis of Amazonian freshwater cururu stingray Potamotrygon cf. histrix

Non-lethal assessment of reproductive characteristics for management and conservation of sharks

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