A review on the morphology of ovarian follicles in elasmobranchs: A case study in<i>Rhizoprionodon taylori</i>

Waltrick, Daniela; Simpfendorfer, Colin A.; Awruch, Cynthia A.

doi:10.1002/jmor.20644

Cited by 10 publications

(8 citation statements)

References 51 publications

(153 reference statements)

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“…Atresia has been described at all developmental stages of ovarian follicles in cyclostomes, in the ovaries of oviparous, ovoviviparous and viviparous elasmobranchs, as well as in unyolked and yolked ovarian follicles of Teleostei and Chondrostei (Linares‐Casenave et al., 2002 ; Mccully Phillips & Ellis, 2015 ; Saidapur, 1978 ; Waltrick et al., 2017 ). Follicular atresia of teleost fishes has been described as a complex process comprising apoptosis, autophagy—a catabolic process involved in the turnover of long‐lived proteins and organelles—and heterophagy, that is phagocytosis of egg components by granulosa cells acting as macrophages (Cassel et al., 2017 ; Santos et al, 2008 ; Thomé et al., 2009 ).…”

Section: Introductionmentioning

confidence: 99%

Atresia of ovarian follicles in fishes, and implications and uses in aquaculture and fisheries

Corriero

Zupa

Mylonas

et al. 2021

Journal of Fish Diseases

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Atresia of ovarian follicles, that is the degenerative process of germ cells and their associated somatic cells, is a complex process involving apoptosis, autophagy and heterophagy. Follicular atresia is a normal component of fish oogenesis and it is observed throughout the ovarian cycle, although it is more frequent in regressing ovaries during the postspawning period. An increased occurrence of follicular atresia above physiological rates reduces fish fecundity and even causes reproductive failure in both wild and captive‐reared fish stocks, and hence, this phenomenon has a wide range of implications in applied sciences such as fisheries and aquaculture. The present article reviews the available literature on both basic and applied traits of oocyte loss by atresia, including its morpho‐physiological aspects and factors that cause a supraphysiological increase of follicular atresia. Finally, the review presents the use of early follicular atresia identification in the selection process of induced spawning in aquaculture and the implications of follicular atresia in fisheries management.

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Section: Introductionmentioning

confidence: 99%

Atresia of ovarian follicles in fishes, and implications and uses in aquaculture and fisheries

Corriero

Zupa

Mylonas

et al. 2021

Journal of Fish Diseases

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“…Observation of elevated P4 for preovulatory and ovulatory sharks supports a maturational role for this hormone but the source of P4 for pre-ovulatory aquarium sharks requires further investigation and consideration. It is possible for elasmobranch pre-ovulatory follicles to undergo atresia and become steroidogenic (Waltrick et al, 2017). Sand tiger sharks females have voluminous uteri and some aquarium females may have commenced ovulation but the few uterine egg cases present elluded detection during examination.…”

Section: Discussionmentioning

confidence: 99%

Reproductive Cycle and Periodicity of In Situ and Aquarium Female Sand Tiger Sharks Carcharias taurus from the Western North Atlantic

et al. 2022

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Fundamental characteristics of the reproductive biology of female sand tiger sharks Carcharias taurus are needed to understand the periodicity, seasonality and environmental factors essential for reproduction in this iconic species. Animals in managed care, such as aquariums, provide the unique opportunity for longitudinal study in contrast to in situ sharks that are examined opportunistically, and at a single point in time. Additionally, comparison of reproductive observations from successfully reproducing in situ sharks and aquarium sharks may help elucidate reasons for lack of reproduction among aquarium sharks and aid the development of assisted reproductive techniques for managed populations. Reproductive status of in situ and aquarium female sharks was assessed using ultrasonography and plasma hormone (17β-estradiol, testosterone, and progesterone) monitoring. The reproductive cycle was divided into eight stages based on ovarian activity and uterine contents. In situ sharks were sampled from Delaware Bay (n = 29), North Carolina (n = 39) and South Carolina (n = 11) during April-November from 2015–2020. Nineteen aquarium females from five aquaria were examined longitudinally for two or more consecutive years. Reproductive regionalization was observed among in situ females with the majority (83%) of North Carolina females in an active state of reproduction and all Delaware females in a resting reproductive state. All aquarium females had a pattern of reproductive cycling that was consistent with alternating years of activity and rest with confirmed biennial (n = 7) or triennial (n = 3) reproductive cycles with spring seasonality. In contrast to in situ females, aquarium females often retained uterine eggs for 9-20 months after ovulation in the absence of a developing embryo(s). Pre-ovulatory aquarium females had significantly higher concentrations of 17β-estradiol, testosterone and progesterone than other reproductive stages. For females in the ovulatory stage, in situ females had higher testosterone than aquarium females. Endocrine differences between successfully reproducing in situ females and aquarium females likely contribute to the limited reproductive success observed for this species in managed care and may be a reflection of diminished seasonal cues and environmental differences.

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“…Histological structures were observed with an optical microscope and images were captured with Olympus software DP2-BSW 2.2 (www.olympus.com). A total of 12 right testes were analysed and spermatogenesis was described based on Maruska et al (1996) (2014) and Waltrick et al (2017)…”

Section: Methodsmentioning

confidence: 99%

Reproductive characteristics and reproductive tract anatomy of the California butterfly ray Gymnura marmorata (Myliobatiformes: Gymnuridae)

Burgos-Vázquez

Galván‐Magaña

Carrera‐Fernández

et al. 2019

Journal of Fish Biology

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The California butterfly ray Gymnura marmorata is frequently caught by artisanal fisheries in north‐western Mexico (Baja California Sur; BCS). The aim of this study was to estimate reproductive characteristics and describe the micro and macroscopic reproductive structures of female and male G. marmorata. Sampling was carried out at two fisheries landing sites located on the west coast BCS, from 2008 to 2012. The largest disc width (WD) ever recorded for this species was 131.0 cm and females were larger than males. The male sample was composed exclusively of adult specimens, with a median size at 50% maturity (WD50) estimated at 44.9 cm WD. For females, size at onset of maturity was estimated at 63.0 cm WD; WD50, at 64.7 cm WD; and size at pregnancy at 80.1 cm WD. Gonadal asymmetry was observed for the first time in this species. Indeed, in males only the left testis was functional (testicular asymmetry), while in females, only the left ovary was functional (ovarian asymmetry).

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A review on the morphology of ovarian follicles in elasmobranchs: A case study inRhizoprionodon taylori

Cited by 10 publications

References 51 publications

Atresia of ovarian follicles in fishes, and implications and uses in aquaculture and fisheries

Atresia of ovarian follicles in fishes, and implications and uses in aquaculture and fisheries

Reproductive Cycle and Periodicity of In Situ and Aquarium Female Sand Tiger Sharks Carcharias taurus from the Western North Atlantic

Reproductive characteristics and reproductive tract anatomy of the California butterfly ray Gymnura marmorata (Myliobatiformes: Gymnuridae)

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