Hormones and Reproduction in Chondrichthyan Fishes

Maruska, Karen P.; Gelsleichter, James

doi:10.1016/b978-0-12-375009-9.10011-6

Cited by 6 publications

(5 citation statements)

References 176 publications

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“…While not dismissing this hypothesis, the authors agree with the suggestion by others that P 4 is also likely to regulate some other, more ephemeral actions during ovulation, such as final oocyte maturation and/or some other aspect of the ovulatory process itself ( e.g ., preparation of the reproductive tract for transit of ova, Koob & Callard, 1999). This argument is based on the high individual variability of P 4 levels observed in this as well as other studies, as well as the inconsistencies in P 4 patterns observed in various elasmobranchs (Gelsleichter & Evans, 2012; Maruska & Gelsleichter, 2011). It is also interesting to consider that P 4 may play some role in the completion of the sperm storage process, as it has been shown to be involved in the release of sperm from short‐ or long‐term sperm storage reservoirs in the reproductive tract of some avian (Ito et al ., 2011) and mammalian (Machado et al ., 2019; Ramal‐Sanchez et al ., 2020; Romero‐Aguirregomezcorta et al ., 2019) species.…”

Section: Discussionsupporting

confidence: 49%

“…Similar observations have been made for northern GOM S. tiburo (Manire et al ., 1995), as well as for other viviparous elasmobranchs including spiny dogfish Squalus acanthias L. (Tsang & Callard, 1987), Atlantic stingray Hypanus sabinus Lesueur 1824 (Snelson Jr. et al ., 1997; Tricas et al ., 2000), round stingray Urobatis halleri Cooper 1863 (Mull et al ., 2010) and Australian sharpnose shark Rhizoprionodon taylori Ogilby 1915 (Waltrick et al ., 2014). A long‐hypothesized role for P 4 during this period is to inhibit E 2 ‐stimulated production of vitellogenin, allowing for the transition from follicular development to gestation (Maruska & Gelsleichter, 2011). While not dismissing this hypothesis, the authors agree with the suggestion by others that P 4 is also likely to regulate some other, more ephemeral actions during ovulation, such as final oocyte maturation and/or some other aspect of the ovulatory process itself ( e.g ., preparation of the reproductive tract for transit of ova, Koob & Callard, 1999).…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 49%

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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“…importance of day of year is suggestive of consistent timing of annual northward migration. The ultimate cause of this consistent migration timing is likely a behavioral or physiological factor such as an annual cycle of hormones related to reproduction (Maruska and Gelschleichter 2011), though associations with the timing of prey availability have been suggested for at least one elasmobranch species (Barnett et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Environmental associations of cownose ray (Rhinoptera bonasus) seasonal presence along the U.S. Atlantic Coast

et al. 2021

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Identifying the mechanistic drivers of migration can be crucial in shaping conservation and management policies. The cownose ray (Rhinoptera bonasus) is a relatively poorly understood elasmobranch species that occurs along the U.S. Atlantic coast and undergoes large-scale seasonal migrations. To better understand the drivers and timing of cownose ray seasonal migration in order to inform potential management measures, we analyzed telemetry detections of 51 mature cownose rays (38 female, 13 male) tagged with acoustic transmitters in the Maryland and Virginia portions of Chesapeake Bay. Detections within their summer habitat in Chesapeake Bay and winter habitat in the vicinity of Cape Canaveral, Florida, were matched with publicly available sea surface temperature (SST) data recorded by data buoys near the areas of tag detections and with local photoperiod and day of year. These variables were used in boosted regression tree models of ray presence (all rays combined, females only, and males only) in each seasonal habitat. Models were developed for presence during the entire summer and winter season, and for the time periods of arrival and departure from both summer and winter habitats. Seasonal presence in both summer and winter habitats was associated with distinct temperature, photoperiod, and date ranges, with temperature as the most influential variable in seasonal models. In models of arrival and departure periods, southward migration (departure from Chesapeake Bay and arrival off Cape Canaveral) was strongly associated with SST for all rays and arrival in the Chesapeake Bay region after northward migration was most strongly associated with day of year. The most influential variable during the period of northward departure from Cape Canaveral differed between males (day of year) and females (SST). This suggests that mature female northward migration may be driven by temperature while male northward migration may be driven by endogenous cues. These findings provide detailed information on the timing of cownose ray arrival at, presence in, and departure from seasonal habitats and provide potential justification for including the species in cross-taxa comparative studies on migratory behavior.

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“…We also found that plasma E 2 and T levels coincide with oocyte development and maturation in L. japonicus . Sexual development in female teleosts is highly correlated with plasma E 2 , and major spikes in blood levels occur prior to ovulation ( Norberg et al., 1989 ; Maruska & Gelsleichter, 2011 ; Awruch, 2015 ). Estradiol synthesis is initiated during previtellogenesis and reaches a maximum during vitellogenesis, which is 0.5–1.5 months prior to spawning ( Wallace & Selman, 1981 ; Ng & Idler, 1983 ).…”

Section: Discussionmentioning

confidence: 99%

Reproduction and Maturation of Sea Bass, Lateolabrax japonicus, after Transportation from Net-Cages to Indoor Tanks

Dh¹,

Kim²,

Im³

2021

Dev. Reprod.

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To determine whether the reproductive processes of sea bass, Lateolabrax japonicus , proceed normally after transportation from an outdoor net-cage into indoor tanks, we examined changes in the gonadosomatic index (GSI), histological gonadal tissue, and plasma levels of sex hormones (testosterone and estradiol-17ß) during their annual reproductive cycle. We also measured maturation and spawning across two sea water salinity levels (full and low salinity). Fecundity was estimated by the relationship between egg number and body size in female sea bass. Monthly changes in the GSI, histological gonadal tissues, and oocyte size showed both male and female sea bass reach final maturation in January and February, respectively, indicating that the spermiation of males occurs earlier than the spawning of females. The histological results indicated that the sea bass is a multiple spawner, similar to many marine teleosts, exhibiting group-synchronous oocyte development. Female maturation and spawning were enhanced in lower salinity seawater (29.6–31.0 psu) compared to that of normal salinity (34.5–35.1 psu). These results confirm that sea bass reproduction can occur successfully in captivity and imply that fertilized eggs can be collected from February to March. Additionally, our results show that lower salinity enhances oocyte maturation and spawning of female sea bass.

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Hormones and Reproduction in Chondrichthyan Fishes

Cited by 6 publications

References 176 publications

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

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

Environmental associations of cownose ray (Rhinoptera bonasus) seasonal presence along the U.S. Atlantic Coast

Reproduction and Maturation of Sea Bass, Lateolabrax japonicus, after Transportation from Net-Cages to Indoor Tanks

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