Profiles of plasma sex steroids and gonadotropin in coho salmon, Oncorhynchus kisutch, during final maturation

Fitzpatrick, Martin S.; Kraak, Glen Van Der; Schreck, Carl B.

doi:10.1016/0016-6480(86)90054-7

Cited by 171 publications

(92 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The changes in plasma sex steroids and gonadotropins during maturation of the spring chinook salmon females observed in this study are similar to that reported for Willamette River spring chinook salmon females (Slater et al 1994), as well as many other salmonid fish (Sower and Schreck 1982, Fitzpatrick et al 1986, Truscott et al 1986, Sumpter and Scott 1989. The classic shift from E to 17,20β-P production that occurs at the end of vitellogenesis and during the onset of final oocyte maturation was observed in both Rapid River and captive Lemhi River females.…”

Section: Sex Steroidssupporting

confidence: 86%

Research on Captive Broodstock Programs for Pacific Salmon; Assessment of Captive Broodstock Technologies, Annual Report 2002-2003.

Berejikian¹

2004

View full text Add to dashboard Cite

Section: Sex Steroidssupporting

confidence: 86%

Research on Captive Broodstock Programs for Pacific Salmon; Assessment of Captive Broodstock Technologies, Annual Report 2002-2003.

Berejikian¹

2004

View full text Add to dashboard Cite

“…In the last stages of ovarian maturation, just before ovulation, the rapid estradiol level drop is followed by the diminution of dopamine production. Thanks to this phenomenon there is a potentiation of GnRH action and appearance of LH ovulatory surge and ovulation as observed in coho salmon (Fitzpatrick et al, 1986) or rainbow trout (Saligaut et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

“…In the last stages of ovarian maturity, just before ovulation, the drop of dopamine production follows a rapid drop of estradiol levels. Thanks to this phenomenon the potentiation of GnRH action and the appearance of LH ovulatory surge and ovulation may occur (Fitzpatrick et al, 1986;Saligaut et al, 1999). The aim of this study was to provoke the LH ovulatory wave in carp and goldfish by the use of an aromatase inhibitor -fadrozole.…”

mentioning

confidence: 99%

LH secretion and 17ββ-estradiol concentration in the blood plasma and hypothalamus of goldfish (Carassius auratus gibelio B.) and common carp (Cyprinus carpio L.) treated with fadrozole (aromatase inhibitor) and GnRH analogues

Mikołajczyk¹,

Sokolowska-Mikolajczyk²,

Chyb³

et al. 2007

CZECH J ANIM SCI

View full text Add to dashboard Cite

Fadrozole -a non-steroidal aromatase inhibitor was applied to common carp and goldfish to examine its ability to potentiate the stimulatory action of GnRH analogues on LH secretion in vivo. The goal of the project was to find a substitute for antidopaminergic drugs used with GnRH analogues in fisheries practice to stimulate ovulation in fish bred in captivity. The first trials on goldfish showed a moderate ability of fadrozole to potentiate salmon GnRH analogue stimulation, weaker than that obtained with pimozide (dopamine antagonist). No ovulation in fadrozole-treated fish was observed. Several experiments performed in two consecutive reproductive seasons (different treatment regimes and doses of fadrozole) neither improved nor confirmed the results obtained in the first year. The analysis of 17β-estradiol levels in the blood plasma and in hypothalami showed no changes in the concentration of this steroid in fadrozole-treated fish in comparison with the controls. This shows that fadrozole is not able to replace the antidopaminergic drugs used in fisheries practice and cannot be considered as a potential ovulation inducer in cyprinids.

show abstract

“…Antisera were validated for use in salmonid species (Young et al 1983;Fitzpatrick et al 1986). Plasma IGF-I was measured by RIA methods described by Moriyama et al (1994) as modified by Shimizu et al (2000) and using recombinant trout IGF-I and anti-barramundi IGF-I antiserum (GroPep, South Australia, Australia).…”

Section: Methodsmentioning

confidence: 99%

Changes in Sex Steroids, Growth Hormone, and Insulin‐Like Growth Factor‐I during Ovarian Development in Rainbow Trout Cultured in a Water Recirculating System with Continuous Light

et al. 2015

View full text Add to dashboard Cite

Female Rainbow Trout Oncorhynchus mykiss were cultured within a freshwater recirculating aquaculture system under 24‐h constant lighting in 13°C water and fed every 6 h to near satiation. An opaque roof allowed surface light intensity to vary between <200 and about 1,500 lx. During months 14–26 posthatch we examined changes in plasma concentrations of testosterone (T), estradiol‐17β (E2), the maturation inducing steroid (MIS) 17α,20β‐dihydroxy‐4‐pregnen‐3‐one (17,20βP), growth hormone (GH), and insulin‐like growth factor‐I (IGF‐I). Oocyte diameter was variable at the start of the study, most averaging <1 mm; diameter increased to above 3.2 mm in the final 2 months, with migrating germinal vesicles indicating they were postvitellogenic. Some ovaries exhibited atresia, and no fish ovulated, suggesting some reproductive dysfunction. Testosterone and E2 began increasing between months 16 and 18, and although T continued to increase throughout the study, E2 changed little after month 20. The MIS 17,20βP, remained near or below detection. Plasma GH remained relatively unchanged although values trended slightly higher during the final 4 months, GH being significantly greater at months 22, 24 and 26 than at month 16. Plasma IGF‐I was higher at the first time point, month 14 posthatch than at months 20, 24, 25, and 26. In summary, gradual changes in growth and fillet quality attributes during gonadal development were accompanied by gradual changes in hormone levels, but no clear changes in hormones were associated with rapid changes in product quality traits observed around months 24–26.

show abstract

Profiles of plasma sex steroids and gonadotropin in coho salmon, Oncorhynchus kisutch, during final maturation

Cited by 171 publications

References 50 publications

Research on Captive Broodstock Programs for Pacific Salmon; Assessment of Captive Broodstock Technologies, Annual Report 2002-2003.

Research on Captive Broodstock Programs for Pacific Salmon; Assessment of Captive Broodstock Technologies, Annual Report 2002-2003.

LH secretion and 17ββ-estradiol concentration in the blood plasma and hypothalamus of goldfish (Carassius auratus gibelio B.) and common carp (Cyprinus carpio L.) treated with fadrozole (aromatase inhibitor) and GnRH analogues

Changes in Sex Steroids, Growth Hormone, and Insulin‐Like Growth Factor‐I during Ovarian Development in Rainbow Trout Cultured in a Water Recirculating System with Continuous Light

Contact Info

Product

Resources

About