Histochemical study of the oviducal gland and analysis of the sperm storage tubules of Mustelus schmitti Springer, 1939 (Chondrichthyes, Triakidae)

Elías, Fernanda Gabriela

doi:10.1590/s0100-736x2015000800006

Cited by 5 publications

(2 citation statements)

References 23 publications

(17 reference statements)

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“…The isthmus, which is a connecting segment between the oviducal gland and the uterus, has been shown in several chondrichthyan species [ 8 , 10 , 12 , 18 , 19 , 68 – 72 ], but it is not found in F. signifer , similar to G. poecilura [ 39 ]. Three types of the uterine epithelia in adults have been identified with interspecific variability: (1) a pseudostratified columnar epithelium, as seen in S. acuta and S. bonapartii [ 14 ] and F. signifer ; (2) a simple columnar epithelium in H. colliei [ 20 ], L. erinacea , Rhizoprionodon terraenovae [ 73 ] and Sphyrna tiburo [ 74 ]; and (3) a mixture of simple squamous and simple cuboidal epithelia in Carcharhinus plumbeus [ 75 ].…”

Section: Discussionmentioning

confidence: 99%

Microanatomy of the female reproductive system of the viviparous freshwater whipray Fluvitrygon signifer (Chondrichthyes: Myliobatiformes: Dasyatidae). II. The genital duct

Somsap¹,

Srakaew²,

Chatchavalvanich³

2021

BMC Zool

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Background Fundamental knowledge on microscopic structures of the whole female chondrichthyan genital ducts from a single species remains unavailable. The present study describes microanatomy of the entire female genital duct (anterior oviduct, oviducal gland, uterus and vagina) of the freshwater dasyatid Fluvitrygon signifer. Results The females have only the left genital duct. The genital ducts reveal histological variation among individuals in terms of tissue organization, histochemical profiles and secretory activities. The anterior oviducts of mature females possess branched mucosal folds and exhibit dynamic relationship between production and secretion of secretory substances, while those of immature/regenerating females have short, unbranched mucosal folds and inactive secretory activities. The oviducal gland comprises glandular tubules, which show histological and histochemical heterogeneity and, thus, can be classified into three types. The uterus is categorized into five patterns principally based on histological features of the trophonematal and uterine mucosa. The vagina displays different histochemical reactions, likely reflecting various degrees of glycosylation of secretory granules. Conclusions The genital ducts of the females of F. signifer show differential microscopic and histochemical characteristics, indicating their different reproductive statuses.

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Section: Discussionmentioning

confidence: 99%

Microanatomy of the female reproductive system of the viviparous freshwater whipray Fluvitrygon signifer (Chondrichthyes: Myliobatiformes: Dasyatidae). II. The genital duct

Somsap¹,

Srakaew²,

Chatchavalvanich³

2021

BMC Zool

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“…Therefore, these results suggest that the female sperm storage may occur in NWA S. tiburo populations for 6–7 months following copulatory activity, which was confirmed to occur in late September based on direct evidence of male‐induced mating wounds on females as well as the presence of spermatozoa in both the lumen and SSTs of the oviducal gland. Although similar evidence for short‐ to long‐term sperm storage in the oviducal gland has been reported for several elasmobranch species ( e.g ., gummy shark Mustelus antarcticus Günther 1870, Storrie et al ., 2008; Portuguese dogfish Centroscymnus coelolepis du Bocage and Capello 1864, Moura et al ., 2011; narrownose smoothhound Mustelus schmitti Springer 1939, Elías, 2015; common smoothhound Mustelus mustelus L., Maduna et al ., 2018), the physiological mechanisms that control this process and its fitness benefits remain largely unstudied. Because of their abundance in southeast U.S. waters and well‐described reproductive patterns, S. tiburo is a good candidate species for further study on this topic.…”

Section: Discussionmentioning

confidence: 99%

Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean

Acevedo

Frazier

Belcher

et al. 2020

Journal of Fish Biology

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The present study examined temporal changes in plasma sex hormone concentrations and the morphology and histology of reproductive organs in mature northwest Atlantic (NWA) bonnetheads Sphyrna tiburo L. to characterize reproductive cycle, breeding periodicity and fertility in this still poorly studied population. Progressive increases in testis width, epididymis head width, plasma testosterone (T) concentrations, and occurrence of mature spermatozoa were observed in male S. tiburo from June to September, demonstrating that spermatogenesis occurs during the summer. Nonetheless, increases in maximum follicle diameter, oviducal gland width, plasma 17β-estradiol and T concentrations, and occurrence of vitellogenic follicles were not observed in mature females until between October and April, demonstrating nonsynchronous patterns of gametogenesis in males and females. Fresh copulatory wounds were observed in females collected during late September along with histological evidence for sperm presence in the oviducal gland between September and April, confirming a 6-to 7 month period of female sperm storage. Ovulation occurred between mid-April and early May in concert with increases in female plasma progesterone concentrations. Gestation occurred during a 4.5-to 5 month period between May and early September, and 97% of mature females collected during this period were gravid, indicating a highly synchronized, annual reproductive periodicity. Brood size was significantly correlated with maternal size and ranged from 1 to 13 pups with a mean ± S.D. of 8.1 ± 2.2, which was significantly lower than reported in Gulf of Mexico (GOM) populations. The occurrence of non-fertile offspring was observed in 17% of broods with a range of 1-7 non-fertile eggs present in individual females. Thus, as previously reported in GOM S. tiburo, this unusual form of infertility also appears to be prevalent in the NWA population and requires further study. This study has demonstrated meaningful differences in reproductive biology of these populations, emphasizing the need for region-specific approaches for population management.

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Observations of sperm storage in some deep-sea elasmobranchs

Dutilloy

Dunn

2020

Deep Sea Research Part I: Oceanographic Research Papers

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Histochemical study of the oviducal gland and analysis of the sperm storage tubules of Mustelus schmitti Springer, 1939 (Chondrichthyes, Triakidae)

Cited by 5 publications

References 23 publications

Microanatomy of the female reproductive system of the viviparous freshwater whipray Fluvitrygon signifer (Chondrichthyes: Myliobatiformes: Dasyatidae). II. The genital duct

Microanatomy of the female reproductive system of the viviparous freshwater whipray Fluvitrygon signifer (Chondrichthyes: Myliobatiformes: Dasyatidae). II. The genital duct

Reproductive cycle and fecundity of the bonnethead Sphyrna tiburo L. from the northwest Atlantic Ocean

Observations of sperm storage in some deep-sea elasmobranchs

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