The brain-pituitary-gonad axis and the gametogenesis

Borella, Maria Inês; Chehade, Chayrra; Costa, Fabiano Gonçalves; Jesus, Lázaro Wender Oliveira de; Cassel, Mônica; Batlouni, Sérgio Ricardo

doi:10.1016/b978-0-12-815872-2.00014-2

Cited by 8 publications

(7 citation statements)

References 166 publications

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“…We emphasize that the number of wild breeders authorized to be collected in this project by environmental agencies in São Paulo State, Brazil, did not include fish enough to perform control groups treated only with saline solution. Furthermore, because of the risk of loss of the scarce wild breeders during the hormonal induction procedure and because it is widely and for decades known that breeders of this and most rheophilic fish do not reproduce without hormonal induction (for review see Von Ihering and Azevedo, 1936;Nagahama and Yamashita, 2008;Bobe and Labbé, 2010;Mylonas et al, 2010;Borella et al, 2014Borella et al, , 2019, we opted to not use saline controls.…”

Section: Induced Reproductionmentioning

confidence: 99%

“…In this context, one of the bottlenecks for the consolidation of its production in captivity, for aquaculture and preservation purposes, is the attainment of viable embryos through hormonal induction. When kept in captivity, ovarian and testicular maturation takes place, reaching more advanced stages of maturation between November and February (rainy season in Brazil) and, as well as the majority of tropical reophilic fish, hormonal stimulation is required for spawning (Borella et al, 2019;Hainfellner et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Wild Leporinus friderici induced spawning with different dose of mGnRHa and metoclopramide or carp pituitary extract

Souza

Kuradomi

Rodrigues³

2020

Anim Reprod

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How to cite: Souza TG, Kuradomi RY, Rodrigues SM, Batlouni SR. Wild Leporinus friderici induced spawning with different dose of mGnRHa and metoclopramide or carp pituitary extract. Anim Reprod. 2020;17(1):e20190078. AbstractBreeding technology is of utmost importance for reproduction of wild fish in captivity for the reintroduction and selective breeding programs purposes. The main challenge is that when applied to wild undomesticated specimens, conventional protocols often cause breeders and/or embryo mortality and spawning failure. In this study, we evaluated the reproductive performance of wild Leporinus friderici, a great importance fish for subsistence fishing in South American rivers, applying conventional and lower-dose hormonal therapies by means of two consecutive experiments. In the first, a conventional (0.5 and 5.5 mg/kg) and a lower carp pituitary extract (CPE) dose (0.5 and 1.0 mg/kg) were applied. In the second, a conventional mammalian GnRH analogue associated with metoclopramide (mGnRHa + MET) (40 µg mGnRHa + 20 mg MET/kg) and a lower dose (4 μg mGnRHa + 2 mg MET/kg and 8 µg + 4 mg of mGnRHa + MET/kg) were applied. Ovulation was observed in all treatments, however, only lower CPE protocol provided viable embryos. High levels of 17α,20β-dihydroxy-4-pregnen-3-one (DHP) and 17β estradiol (E 2 ) detected in conventional, but not in lower CPE dose, at ovulation, might be associated to the mortality of the embryos. The use of lower CPE dose applied here was the best way to obtain L. friderici viable embryos. These results directly contribute to the knowledge about poorly explored effects of reproductive management and hormonal therapies in wild-type breeders, showing that the use of reduced doses may be an alternative to reproductive success.

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Section: Induced Reproductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wild Leporinus friderici induced spawning with different dose of mGnRHa and metoclopramide or carp pituitary extract

Souza

Kuradomi

Rodrigues³

2020

Anim Reprod

Self Cite

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“…The gonadal histomorphology and the hormonal profile of the pituitary-gonadal axis are useful tools to track the reproductive cycle of wild fish (Brown-Peterson et al 2011;Alix et al 2020;Borella et al 2020). The ovarian development of L. surinamensis in the southern Atlantic suggests that this species is a multiple-spawning species with asynchronous oocyte development due to the presence of different development phases of oocytes in the same animal.…”

Section: Discussionmentioning

confidence: 99%

Seasonal morphophysiological changes during the reproductive cycle of the tripletail fish Lobotes surinamensis (Perciformes: Lobotidae) in the western South Atlantic

et al. 2021

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and follicle-stimulating hormone (FSH) were evaluated in all seasons. The histological analysis of the gonads showed that L. surinamensis is a multiple spawner with an asynchronous oocyte development. The gene expression of fshβ did not change throughout the reproductive cycle in males and females, while the gene expression of lhβ in males was higher in the summer compared to the autumn/winter periods. Plasma E 2 was higher in females and 11-KT in males during spring. Gonadal development, plasma level of E 2 (females), and 11-KT (males) are indicators that L. surinamensis reproduce during the spring and summer in Paraty Bay, while the gene expression levels of gonadotropins in females and fshβ in males were not useful physiological tools to establish the reproductive season. The results suggest an active expression throughout the year, a profile expected in multiple spawning species, as proposed here for the L. surinamensis.

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“…The GnRH is a key player for reproductive activity (Chaube et al, 2015;Golan et al, 2015;Honji et al, 2019). When C. gariepinus broodstock spawn, the gonads are influenced by the hypothalamus, as it synthesizes and liberates the GnRH, stimulates the anterior pituitary to produce the gonadotropin hormone; gonadotropins stimulate steroidogenesis (Zohar et al, 2010;Borella et al, 2020).…”

Section: Clarias Gariepinusmentioning

confidence: 99%

Gonad-stimulating potential of laserpuncture induction on the male African Sharptooth catfish (Clarias gariepinus)

Hariani¹

2021

Egypt. J. of Aquatic Biolo. and Fish.

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The brain-pituitary-gonad axis and the gametogenesis

Cited by 8 publications

References 166 publications

Wild Leporinus friderici induced spawning with different dose of mGnRHa and metoclopramide or carp pituitary extract

Wild Leporinus friderici induced spawning with different dose of mGnRHa and metoclopramide or carp pituitary extract

Seasonal morphophysiological changes during the reproductive cycle of the tripletail fish Lobotes surinamensis (Perciformes: Lobotidae) in the western South Atlantic

Gonad-stimulating potential of laserpuncture induction on the male African Sharptooth catfish (Clarias gariepinus)

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