Testis and sperm morphology in two deep‐water squaloid sharks, <i>Centroscymnus coelolepis</i> and <i>Centrophorus squamosus</i>

Girard, M.; Rivalan, P.; Sinquin, G.

doi:10.1111/j.1095-8649.2000.tb02233.x

Cited by 26 publications

(13 citation statements)

References 15 publications

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“…This strategy gives emphasis to the importance of sperm storage for reproduction because sperm is held since early development stages until males' become structurally capable for fertilization. Once males are mature, sperm becomes continuously available (Girard, Rivalan & Sinquin, 2000). It is possible that the secretory activity detected in the seminal vesicle might be used to preserve sperm, or be involved in the final stages of sperm maturation, including motility acquisition (Minamikawa & Morisawa, 1996).…”

Section: Discussionmentioning

confidence: 99%

Sperm storage in males and females of the deepwater shark Portuguese dogfish with notes on oviducal gland microscopic organization

et al. 2011

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Sperm storage in males and females was studied for the deepwater shark Portuguese dogfish Centroscymnus coelolepis. In males, sperm is stored in the seminal vesicle from early maturity stages until mating. The epithelium of the seminal vesicle secretes an acid mucopolysaccharide that might preserve sperm until it is released. The oviducal gland (OG) presents the four distinct zones described for other elasmobranchs: club, papillary, baffle and terminal. Mature, pregnant, resting and regenerating females are able to store sperm in the terminal zone. Sperm was found within sperm storage tubules (SSTs), involved by a secretory matrix. The localization of SSTs deeper in the OG suggests long-term sperm storage, which is in agreement with the long reproductive cycle described for this species. Sperm storage is an advantage for this deepwater species that presents sexual segregation and lives in a food-constrained environment, increasing the efficiency in reproduction.

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Section: Discussionmentioning

confidence: 99%

Sperm storage in males and females of the deepwater shark Portuguese dogfish with notes on oviducal gland microscopic organization

et al. 2011

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“…In the shark families Carcharhinidae (requiem sharks), Sphyrnidae (hammerhead sharks), Somniosidae (sleeper sharks), Centrophoridae (gulper sharks), and Triakidae (hound sharks), testes develop diametrically, from the ventral to dorsal surface of the epigonal organ (Pratt, ; Girard et al, ; Rogers, 2013). In diametric development, spermatogenesis proceeds from one wall across the diameter of the testis to the opposite wall, where efferent ducts collect the spermatozoa (Park et al, ).…”

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confidence: 99%

“…In the ventral peripheric area of the germinal zone, only spermatogonias cysts are present. The development of the seminiferous follicles proceeds from the germinal zone towards the opposite wall, where the spermatozoids cysts are located (Pratt, ; Girard et al, ; Carrier et al, ; Rogers, 2013). However, although testicular structure and development have been described in several shark species with diametric testes (REF), a robust description of ontological changes in testes histomorphometry and comparisons of testes structures among species is not yet available.…”

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confidence: 99%

Comparison of the Morphology and Histomorphometry of Spermatogenic Cyst of Three Sharks Species With Diametric Testes

Rêgo

Fitzpatrick

Hazin

et al. 2016

The Anatomical Record

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Characterization of the reproductive anatomy of elasmobranchs (sharks, skates, rays, and sawfish) offers unique insights into the evolution of reproductive traits in animals due to their phylogenetic position at the base of the vertebrate tree of life. Yet, despite advances in our understanding of male elasmobranch reproductive physiology and testes histology, very little is known about how testes histomorphometrics varies with male maturation. In this study, we characterize and contrast testes morphology and histomorphology of males at different maturation stages in three shark species with diametric testes development: Prionaceglauca, Rhizoprionodon lalandii, and Mustelus canis. All stages of spermatogenesis were observed in P. glauca and R. lalandii, while for M. canis, only males at early stages of maturation were examined and therefore all the spermatogenesis cells lineage were not present. The number of Sertoli cells increased with cell development by six times in R. lalandii and roughly four times in P. glauca, and were statistically different among stages of spermatogenesis cysts in both species. Statistical differences in cyst diameter and Sertoli cell numbers were observed between P. glauca and R. lalandii. The increase of spermatocyte II cell diameter described for R. Lalandii in this study was not usual to elasmobranch species as compared, for example, to P. glauca. This information proves the importance of studying the testicular development and the process of spermatogenesis is necessary for understanding the reproductive biology of the species, including life cycles and history, variation of reproductive morphology. Anat Rec,

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“…Previous studies into the biology of deepwater squaloid sharks have mainly focussed on the essentially mid-slope species of Centroscyllium, Centroscymnus, Deania and Etmopterus from the North Atlantic Ocean (Yano 1995;Jakobsdóttir 2001;Clarke et al 2002), Japan (Yano andTanaka 1984, 1988) and New Zealand (Wetherbee 1996), while most studies into the biology of Centrophorus dealt with C. squamosus from the north-west Atlantic, for example Girard and Du Buit (1999), Girard et al (2000), Clarke et al (2001), Bañón et al (2008), Figueiredo et al (2008) and Severino et al (2009). Of the shallower upper-slope species, Bass et al (1976) gave brief details of size at maturity for 'C.…”

Section: Introductionmentioning

confidence: 99%

Distribution, reproduction and population structure of three gulper sharks (Centrophorus, Centrophoridae) in south-east Australian waters

Graham

Daley

2011

Mar. Freshwater Res.

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Abstract. Gulper sharks (Centrophorus spp.) are commercially fished in all oceans but the taxonomy and biology of many species are not clearly defined, and stocks are extremely vulnerable to over-exploitation. We present distributional, size-frequency and reproductive data for three species (Centrophorus harrissoni, C. moluccensis and C. zeehaani) that fishing has largely extirpated from the south-east Australian upper continental slope. Trawl-survey catches in 1976-77 from lightly exploited stocks comprised mostly mature males with few mature females or juveniles; a 2009 long-line survey caught higher proportions of mature females and, for C. harrissoni, more juveniles. Females of the three species grew larger and reached maturity at a greater size than males and, for both sexes, maturity sizes were more than 80% of their maximum observed lengths. Reproduction was continuous but data were insufficient to determine seasonality. Ovarian and uterine fecundity were singular for C. zeehaani whereas C. harrissoni and C. moluccensis developed two oocytes and produced one or two embryos; evidence suggests that the left-side uterus is less functional than the right-side. In response to these species' inherent low productivity and continuing reduced numbers, managers have introduced landing restrictions and area closures to enhance Centrophorus stocks in southern Australian waters.

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Testis and sperm morphology in two deep‐water squaloid sharks, Centroscymnus coelolepis and Centrophorus squamosus

Cited by 26 publications

References 15 publications

Sperm storage in males and females of the deepwater shark Portuguese dogfish with notes on oviducal gland microscopic organization

Sperm storage in males and females of the deepwater shark Portuguese dogfish with notes on oviducal gland microscopic organization

Comparison of the Morphology and Histomorphometry of Spermatogenic Cyst of Three Sharks Species With Diametric Testes

Distribution, reproduction and population structure of three gulper sharks (Centrophorus, Centrophoridae) in south-east Australian waters

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