Effects of dietary estradiol-17β in juvenile shortnose sturgeon, Acipenser brevirostrum, Lesueur

Flynn, Shawn R.; Benfey, Tillmann J.

doi:10.1016/j.aquaculture.2007.04.073

Cited by 18 publications

(14 citation statements)

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“…Preliminary studies on Acipenser naccarii have also suggested that the feminizing effect of 17b-estradiol is already evident at a late stage of embryogenesis (Grandi et al 2007). However, although it is probable that steroids are the physiological inducers of sex differentiation in sturgeon (Fedorov et al 1990;Flynn and Benfey 2007b;Omoto et al 2002), the mechanisms by which exogenous steroids induce sex differentiation are not yet clear.…”

Section: Discussionmentioning

confidence: 97%

Whole-body concentrations of cortisol and sex steroids in white sturgeon (Acipenser transmontanus, Richardson 1836) during early development and stress response

et al. 2008

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In general little is known about hormones and the ontogeny of the stress response in the early developmental stages of chondrostean fishes and in particular of white sturgeon (Acipenser transmontanus, Richardson 1836). In this study, we measured for the first time cortisol and sex steroids (testosterone and estradiol) in eggs, larvae, post-larvae,\ud and fry of white sturgeon by radioimmunoassay (RIA), to elucidate some endocrine aspects of its development. The cortisol, testosterone, and 17b-estradiol of maternal origin found in unfertilized eggs of white sturgeon probably regulate both growth and development of the\ud embryo. Cortisol decreased after fertilization, whereas testosterone and 17b-estradiol did not significantly change. During the late stages of embryo development and immediately after hatching, endogenous production of cortisol and sexual steroids, respectively, occurred. Sex steroids may be physiological inducers of gonad sex differentiation in sturgeon. All steroids showed an increase 10 days post-hatch (dph), near the transition\ud from an endogenous to an exogenous energy source. Cortisol maintained the same basal levels even after metamorphosis, whereas testosterone and 17b-estradiol declined significantly in post-larvae at 35 and 45 days post-hatch. In addition, to evaluate the ontogeny of\ud a functional hypothalamic-pituitary-interrenal (HPI) axis, larvae and fry were submitted to acute stress. The HPI axis did not seem to be functional on the first day post-hatch, but\ud became so from the third day post-hatch onward

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Section: Discussionmentioning

confidence: 97%

Whole-body concentrations of cortisol and sex steroids in white sturgeon (Acipenser transmontanus, Richardson 1836) during early development and stress response

et al. 2008

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“…Sturgeon gonad differentiation would take place for 6 months to 2 years of age depended on species, geographical and environmental conditions (Akhundov, ). Anatomical differentiation was observed in sterlet ( Acipenser ruthenus Linnaeus, 1758) at 8 month old, bester (female Huso huso https://en.wikipedia.org/wiki/Carl_Linnaeus, https://en.wikipedia.org/wiki/10th_edition_of_Systema_Naturae × male Acipenser ruthenus Linnaeus, 1758), shortnose sturgeon ( Acipenser brevirostrum Lesueur, 1818), Adriatic sturgeon ( Acipenser naccarii Bonaparte, 1836) at 6 month old and Russian sturgeon ( Acipenser guldenstaedti Brandt & Ratzeburg, 1833) at 3 month old (Akhundov & Fedorov, ; Flynn & Benfey, ; Grandi et al, ; Omoto et al, ; Wrobel, Geseres, & Schimmel, ). In this study, hormone therapy was initiated on juvenile gynogen of ship sturgeon at 5 months old.…”

Section: Discussionmentioning

confidence: 99%

“…The survival rate in two experimental groups of 10 and 50 mg MT/kg feed compared with gynogen control (no hormone) and it exhibited that increasing of MT dose from 10 to 50 declined survival rate to 60%. Higher doses (>50 mg MT/kg feed) were not used in this study because of higher mortality as Flynn and Benfey () announced the range of doses administered has negative effects of E 2 on feeding behaviour and subsequent growth increased with dose. These higher doses were also caused high mortality in some experiments.…”

Section: Discussionmentioning

confidence: 99%

“…Gynogenetic fish with mean length 16.8 (1.4 SD ) cm and mean weight 66.4 (4.5 SD ) g (5 months old) were used for sex reversal using 17α‐methyl testosterone (MT) (Molecula, Dorset, UK). Two treatments included 10 mg MT/kg feed and 50 mg MT/kg feed were applied according to the method of Flynn and Benfey () with some modifications. A treatment of gynogen control was considered without hormonal induction.…”

Section: Methodsmentioning

confidence: 99%

“…The effects of 17β estradiol (E 2 ) and methyl testosterone (MT) were examined on sexual differentiation in the bester, a hybrid between female beluga ( Huso huso https://en.wikipedia.org/wiki/Carl_Linnaeus, https://en.wikipedia.org/wiki/10th_edition_of_Systema_Naturae) and male sterlet (Omoto et al, ). Feminization successfully performed in shortnose sturgeon ( Acipenser brevirostrum Lesueur, 1818) (Flynn & Benfey, ) and Adriatic sturgeon ( Acipenser naccarii Bonaparte, 1836) (Grandi, Giovannini, & Chicca, ). They suggested E 2 ‐immersion treatment was more effective than administration through food and E 2 ‐immersion could be a good approach to control sex differentiation and caviar production.…”

Section: Introductionmentioning

confidence: 99%

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Masculinization of the gynogenetic juvenile ship sturgeon (Acipenser nudiventrisLovetsky, 1828) using 17α‐methyl testosterone

et al. 2019

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In sturgeons, the induction of gynogenesis and sex reversal could be important for potential production of neomale sturgeon and all‐female progeny for caviar production. The aim of this study was sex reversal of ship sturgeon (Acipenser nudiventris Lovetsky, 1828) gynogen into male sex. Five‐month‐old gynogens were sex reversed into male by including 17α‐methyl testosterone in their food for 7 months. Three treatments were considered as follows: (a) without treated (gynogen control), (b) 10 mg MT/kg diet, and (c) 50 mg MT/kg diet. All treatments (60 individuals) were sampled both the 30 and 36 months old and their sex was determined using classical histology method of gonad. The sex ratio of the progenies in the gynogen control were 73.3% female and 26.7% male. In treatment of 10 mg MT/kg feed, 18 specimens were studied that half of them (50%) showed pseudo‐testicular structure in the female gonad. That is 50% of the specimens were intersex, 27.7% were male and 22.3% were female. All of the fish fed by 50 mg MT/kg feed had been sex reversed to male. Sexual maturation of these fish had been recognized in stage III at 36 months old. In conclusion, 50 mg MT/kg feed found as effective dose for successful sex reversal in gynogenetic ship sturgeon.

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Sex Determination in Sturgeon

Wuertz

Güralp²,

Pšenička³

et al. 2018

Sex Control in Aquaculture

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Effects of dietary estradiol-17β in juvenile shortnose sturgeon, Acipenser brevirostrum, Lesueur

Cited by 18 publications

References 14 publications

Whole-body concentrations of cortisol and sex steroids in white sturgeon (Acipenser transmontanus, Richardson 1836) during early development and stress response

Whole-body concentrations of cortisol and sex steroids in white sturgeon (Acipenser transmontanus, Richardson 1836) during early development and stress response

Masculinization of the gynogenetic juvenile ship sturgeon (Acipenser nudiventrisLovetsky, 1828) using 17α‐methyl testosterone

Sex Determination in Sturgeon

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