Relationship between reproductive biology and age composition and growth in Urolophus lobatus (Batoidea: Urolophidae)

White, William T.; Platell, M. E.; Potter, I. C.

doi:10.1007/s002270000436

Cited by 75 publications

(91 citation statements)

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“…Embryos of U. venezuelae were registered in both uteri as was mentioned for U. rogersi (Mejía-Falla et al 2012). In contrast embryos of Urolophus lobatus (White et al 2001) and Gymnura micrura (Kobelkwosky 2004), were only present in left uterus. Most of the females were categorized as immature (I), as was previously described for Salguero beach (Téllez et al 2006); however, mature males (III) were the most important during the present study differing from the mentioned authors who described higher abundance of immature males.…”

Section: Resultsmentioning

confidence: 64%

“…Size maturity was calculated choosing mature females (stages IIIa, IIIb, and IV); in the case of males only the mature ones were included (stage III) (White et al 2001). Because the assumption of homogeneity of variances was not fulfilled, the non-parametric Wilcoxon test was improved to establish statistically significant differences between right and left ovary weights (White et al 2001).…”

Section: Mature IIImentioning

confidence: 99%

“…Because the assumption of homogeneity of variances was not fulfilled, the non-parametric Wilcoxon test was improved to establish statistically significant differences between right and left ovary weights (White et al 2001). Relationships between total length (TL) and number of embryos (NE) were evaluated using linear regression (Conrath 2005).…”

Section: Mature IIImentioning

confidence: 99%

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REPRODUCTIVE BIOLOGY OF THE VENEZUELA ROUND STINGRAY Urotrygon venezuelae SCHULTZ FROM THE COLOMBIAN CARIBBEAN

et al. 2015

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As for most batoid species, little is known about the basic biology of the Venezuela round stingray Urotrygon venezuelae (Urotrygonidae). This study presents information about the reproductive biology of the species, including fecundity, embryonic development stage, relationship between maternal size and fecundity, gonadosomatic (GSI) and hepatosomatic (HSI) indices, sex ratios, maturity size and size at birth. With all this information, a preliminary reproductive cycle is proposed. A total of 269 specimens were caught with beach seine in Salguero beach, Colombian Caribbean Sea, between August 2005 and October 2006. We propose for U. venezuelae a biological cycle with three reproductive peaks: November-December, March-April and August. Size at sexual maturity was calculated in 176 mm (total length) for females and 227 mm for males; fecundity ranged between one and six embryos per female. We found that cloacal diameter and liver weight were better predictors for fecundity than total length for U. venezuelae.

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Section: Resultsmentioning

confidence: 64%

Section: Mature IIImentioning

confidence: 99%

Section: Mature IIImentioning

confidence: 99%

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REPRODUCTIVE BIOLOGY OF THE VENEZUELA ROUND STINGRAY Urotrygon venezuelae SCHULTZ FROM THE COLOMBIAN CARIBBEAN

et al. 2015

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“…reproductiove symetry observed in the common eagle ray Myliobatis aquila (Capapé et al 2007)], is very widespread in Myliobatiformes. Most species show reproductive asymmetry related to development and functionality of ovaries and uteri (Hamlett et al 1985;Smith & Merriner 1986;Johnson & Snelson 1996;White et al 2001;Neer & Thompson 2005). Although both ovaries and uteri are functional in some species, asymmetric fertility and fecundity has been observed (Babel 1967;Charvet-Almeida et al 2005;Fahy et al 2007) and even the bat ray Myliobatis californica has a nearly non-functional right ovary but fully functioning right and left uterus (Martin & Cailliet 1988).…”

Section: Discussionmentioning

confidence: 99%

“…After yolk depletion, embryos became entirely dependent on histotrophe, which is ingested orally because external filaments are completely absorbed. Furthermore, in some species, enlarged trophonemata have been observed entering into the gill slits, mouth (Babel 1967;Smith & Merriner 1986) and even spiracles (White et al 2001). This pattern was also corroborated in other Myliobatids such as Urolophus halleri (Babel 1967) and Rhinoptera bonasus (Smith & Merriner 1986).…”

Section: Discussionmentioning

confidence: 99%

Uterine dynamics of the southern eagle rayMyliobatis goodei(Chondrichthyes: Myliobatidae) from the southwest Atlantic Ocean

Colonello

Christiansen

Cousseau

et al. 2013

Italian Journal of Zoology

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Uterine layer changes and their relationship with the reproductive cycle were analyzed for the southern eagle ray Myliobatis goodei (Chondrichthyes: Myliobatidae), based on histological and histometric studies. The specimens were collected from bottom-trawl surveys conducted in the coastal southwest Atlantic ecosystem between latitude 34 and 42 • S. Oviduct samples were removed and fixed in 10% buffered formalin until processing for histological analysis. Both oviducts are developed in mature females, but only the left is functional. After ovulation, the size of the right posterior oviduct decreases and the left develops into a complex uterus that occupies almost the entire coelomic cavity. This uterus undergoes successive morphological and functional changes related to reproductive stages. Mucosa was characterized by temporal villous extensions or trophonemata with high variability depending on reproductive events. Invaginations or crypts associated with presumably lipid secretion (histotrophe) were observed between the trophonematum bases. The muscular layer develops into a complex muscular-vascular-conjunctive structure. The nutrition of early-gestation embryos is lecithotrophic and later they receive nutrients from the yolk sac and histotrophe. After yolk depletion, embryos become entirely dependent on histotrophe. Uterolactation, presumptive water imbibition of the muscular layer, and uterine hypertrophy observed in this study reinforce the "similarities" between Myliobatiformes and mammals.

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Gestational morphogenesis of the uterine epithelium of the gummy shark (Mustelus antarcticus)

Storrie

Walker

Laurenson

et al. 2008

Journal of Morphology

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Developing embryos of the non-placental, viviparous gummy shark (Mustelus antarcticus) are supplied with yolk from external and internal yolk sacs throughout the initial stages of gestation. Yolk supplies are exhausted by the 7th month of an 11-12 month gestation. During embryonic development, there is an approximate 800% gain in dry mass. These factors suggest nutrients are transferred from the mother to the young. The results of the present study provide some insights into how this is occurring. The uteri are paired and both are functional. Using both light and transmission electron microscopy, regions of the uterus were examined throughout maturation and gestation. The layers of the uterine wall throughout the entire length are similar to the uteri of other chondrichthyans previously examined. The uterine epithelium of the body of the uterus is smooth contoured, does not form villi, and undergoes cyclical and secretory changes throughout maturity and gestation. In immature uteri, the epithelium is simple columnar with minimal periodic acid-Schiff-positive and Alcian blue-positive secretory vesicles. In mature uteri, the epithelium is highly stratified with cuboidal cells containing numerous Alcian blue-positive and periodic acid-Schiff-positive vesicles. With pregnancy, prominent changes include a reduction in the number of cell layers, a reduction in cell size, a reduction in the connective tissue intervening between epithelium and blood vessel endothelium, and an increase in blood vessel number and size, so that at term, the uterine compartment consists of a single layer of squamous cells immediately underlain by sinusoidal-like blood vessels. These features along with a small number of secretory vesicles, dilated intercellular spaces, and clear transport vesicles suggest the transepithelial transfer of water and minerals from the maternal to embryonic environment, supplemented by minimal uterine secretions. This is defined as minimal histotrophy and this article represents the first detailed description of this reproductive mode.

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Relationship between reproductive biology and age composition and growth in Urolophus lobatus (Batoidea: Urolophidae)

Cited by 75 publications

References 0 publications

REPRODUCTIVE BIOLOGY OF THE VENEZUELA ROUND STINGRAY Urotrygon venezuelae SCHULTZ FROM THE COLOMBIAN CARIBBEAN

REPRODUCTIVE BIOLOGY OF THE VENEZUELA ROUND STINGRAY Urotrygon venezuelae SCHULTZ FROM THE COLOMBIAN CARIBBEAN

Uterine dynamics of the southern eagle rayMyliobatis goodei(Chondrichthyes: Myliobatidae) from the southwest Atlantic Ocean

Gestational morphogenesis of the uterine epithelium of the gummy shark (Mustelus antarcticus)

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