Mature sex Anguilla

Added: Stephaine Ungar - Date: 25.12.2021 05:00 - Views: 20792 - Clicks: 4248

This study was aimed to investigate whether sexual maturation of immature male eels could be stimulated indirectly by placing them in contact with either male Minj or female Finj eels in which sexual maturation had been stimulated directly by weekly injections of human chorionic gonadotropin hCG or salmon pituitary extract SPErespectively.

Untreated males were placed either in the same tank or in a separate tank that was linked to the injected fish via a recirculation system. The hormonal treatments stimulated spermatogenesis and spermiation in Minj, and ovulation in Finj as well as an increase of the ocular Io and gonadosomatic GSI indices in both sexes. A small peak of plasma 17,20beta-dihydroxypregnenone 17,20betaP occurred during ovulation, while the plasma levels of 17alpha-hydroxypregnene-3,dione 17P were undetectable in both males and females. The water conditioned by Minj and Finj induced ificant, though relatively minor, increases in Io and GSI in uninjected males.

In addition, uninjected fish showed small changes in plasma T and KT levels, apparently related to the timing of spermiation and ovulation of Minj and Finj, respectively, as well as an activation of spermatogenesis but not spermiation. Injected fish released free and conjugated T, KT and E2 into the water, although immature eels were unable to smell by electro-olfactogram any of these steroids or prostaglandin F2alpha.

However, immature males were highly sensitive to water extracts conditioned by spermiating Minj and pre-ovulatory and ovulated Finj. Please enable it to take advantage of the complete set of features! Clipboard, Search History, and several other advanced features are temporarily unavailable. Search: Search. Advanced Clipboard. Display options Display options. Create file Cancel. citation Subject: 1 selected item: - PubMed. Format: Summary Summary text Abstract Abstract text.

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Similar articles Effects of high hydrostatic pressure on the pituitary-gonad axis in the European eel, Anguilla anguilla L. Gen Comp Endocrinol. Epub Jan PMID: Stimulation of spermatogenesis or of sex reversal according to the dose of exogenous estradiol beta in juvenile males of protandrous black porgy, Acanthopagrus schlegeli.

Chang CF, et al. Plasma gonadotropin II, sex steroids, and thyroid hormones in wild striped bass Morone saxatilis during spermiation and final oocyte maturation. Mylonas CC, et al. Broodstock management and hormonal manipulations of fish reproduction.

Epub Mar PMID: Review. Ovarian steroidogenesis and the role of sex steroid hormones on ovarian growth and maturation of the Japanese eel. Kazeto Y, et al. J Steroid Biochem Mol Biol. See all similar articles.

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Cited by 4 articles Changes in the gene expression profiles of the brains of male European eels Anguilla anguilla during sexual maturation. Churcher AM, et al. BMC Genomics. Noninvasive measurement of steroid hormones in zebrafish holding-water. Epub Feb Swimming physiology of European silver eels Anguilla anguilla L. Palstra AP, et al. Fish Physiol Biochem. Structural and functional divergence of two fish aquaporin-1 water channels following teleost-specific gene duplication. Tingaud-Sequeira A, et al. BMC Evol Biol. Publication types Research Support, Non-U.

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Gov't Actions. Animals Actions. Female Actions. Male Actions. Substances Gonadal Steroid Hormones Actions. Sex Attractants Actions.

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Mature sex Anguilla

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Sexually mature European eels (Anguilla anguilla L.) stimulate gonadal development of neighbouring males: possible involvement of chemical communication