Updating control of puberty in male European sea bass: A holistic approach

Carrillo, Manuel; Espigares, F.; Felip, Alicia; Escobar, Sebastián; Molés, Gregorio; Rodríguez, Rafael Moreno; Alvarado, M. V.; Gómez, Ana; Zanuy, Silvia

doi:10.1016/j.ygcen.2015.06.019

Cited by 32 publications

(34 citation statements)

References 49 publications

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“…In fact, in male sea bass fish size and/or energy level are very likely a permissive condition to attain the threshold of hormone synthesis and release needed to achieve its reproductive function (Carrillo et al, 2015).…”

Section: Neuroanatomical Localization Of Sblepr Expressing Cells In Smentioning

confidence: 99%

“…In the current study we report the cloning and the exhaustive characterization of the lepr in the European sea bass (Dicentrarchus labrax). This teleost is a marine perciform of great economic interest that shows a clear interaction between growth, feeding and reproduction (Carrillo et al 2015). But much remains to be done to understand the possible neuroendocrine role of leptin in this species.…”

Section: Introductionmentioning

confidence: 99%

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Leptin receptor gene in the European sea bass (Dicentrarchus labrax): Cloning, phylogeny, tissue distribution and neuroanatomical organization

Escobar

Rocha

Felip

et al. 2016

General and Comparative Endocrinology

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In this study, we report the cloning of three transcripts for leptin receptor in the European sea bass, a marine teleost of economic interest. The two shortest variants, generated by different splice sites, encode all functional extracellular and intracellular domains but missed the transmembrane domain. The resulting proteins are therefore potential soluble binding proteins for leptin. The longest transcript (3605bp), termed sblepr, includes all the essential domains for binding and transduction of the signal. Thus, it is proposed as the ortholog for the human LEPR gene, the main responsible for leptin signaling. Phylogenetic analysis shows the sblepr clustered within the teleost leptin receptor group in 100% of the bootstrap replicates. The neuroanatomical localization of sblepr expressing cells has been assessed by in situ hybridization in brains of sea bass of both sexes during their first sexual maturation. At histological level, the distribution pattern of sblepr expressing cells in the brain shows no clear differences regarding sex or reproductive season. Transcripts of the sblepr have a widespread distribution throughout the forebrain and midbrain until the caudal portion of the hypothalamus. A high hybridization signal is detected in the telencephalon, preoptic area, medial basal and caudal hypothalamus and in the pituitary gland. In a more caudal region, sblepr expressing cells are identified in the longitudinal torus. The expression pattern observed for sblepr suggests that in sea bass, leptin is very likely to be involved in the control of food intake, energy reserves and reproduction.

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Section: Neuroanatomical Localization Of Sblepr Expressing Cells In Smentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Leptin receptor gene in the European sea bass (Dicentrarchus labrax): Cloning, phylogeny, tissue distribution and neuroanatomical organization

Escobar

Rocha

Felip

et al. 2016

General and Comparative Endocrinology

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“…In the same way, in European sea bass ( Dicentrarchus labrax ), the fertilization and hatching rates were improved using repeated injections of GnRHa (Forniés et al, ). This species, which also shows a group‐synchronous type of ovarian development, needs high levels of gonadotrophins in a short period of time to induce oocyte maturation and spawning (Asturiano et al, ; Carrillo et al, ). On the other hand, the quality of eggs, in terms of fertilization, hatching and survival rates, obtained with hormonal induction may be often lower than from spontaneously spawning broodstocks in species as southern flounder ( Paralichthys lethostigma ) (Watanabe, Carroll, & Daniels, ) or red snapper ( Lutjanus campechanus ) (Papanikos, Phelps, Williams, Ferry, & Maus, ; Phelps et al, ).…”

Section: Introductionmentioning

confidence: 99%

High-quality spontaneous spawning in greater amberjack (Seriola dumerili, Risso 1810) and its comparison with GnRHa implants or injections

et al. 2018

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Production of sufficient high-quality eggs of greater amberjack (Seriola dumerili) still constitutes the main bottleneck for commercial production of this species. The main objective of this study was to compare the quality of spontaneous spawn of greater amberjack with those obtained by either GnRHa injection or GnRHa implant protocols. Captive amberjack broodstock were distributed in three circular tanks of 40 m 3 . Broodstock from Tank 1 were not hormonally induced and spawned spontaneously, whereas those of Tank 2 were intramuscularly injected with GnRHa (20 µg/ kg body weight) and those of Tank 3 were given EV-500 µg GnRHa implants. The number of eggs per spawn obtained in the broodstock without hormonal treatment was larger than in those obtained with injections or implants. Egg quality was best in broodstock with spontaneous spawn, followed by GnRHa-injected fish and then GnRHa implants. Besides, size of larvae from control and injected broodstock was similar between them and significantly higher (p < 0.01) than those from GnRHa implant spawn. Overall, this study showed that it is possible to obtain very highquality spontaneous spawn in greater amberjack, providing the adequate conditions. Furthermore, GnRHa weekly injections lead to similar egg viability and hatching rates than spontaneous spawn and higher fertilization rates than GnRHa hormonal implants, which is better than in previous studies. K E Y W O R D Segg quality, gonadotrophin-releasing hormone synthetic analogue, induction, Seriola dumerili, spawning

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“…The shorter treatment may have the added advantage of reducing the stress provoked by long-term exposure to LL. In contrast, LL does not prevent maturation at year two, supporting the existence of an endogenous rhythm for reproduction in sea bass [25]. Furthermore, the administration of LP in year two delays maturation (i.e., shifts the peaks for GSI and the percentage of spermiating males from March to April, regardless of the photoperiod treatment used in year one), modifies the annual rhythms of some key hormones [7] and enhances the potential growth of fish [17, this study].…”

Section: Discussionmentioning

confidence: 84%

Effect of Combining Different Photoperiod Regimes on the Sexual Maturation of Male Sea Bass (Dicentrarchus labrax L.) During the First Two Years of Life

Felip¹

2017

JAMB

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This study assesses the effect of combining different photoperiod regimes on the sexual maturation and growth of male sea bass during the first two years of life. In two different trials, regimes of continuous light (LL) lasting 24 consecutive months (Trial 1) or shorter periods within the summer-early autumn months during the first and second annual cycles (Trial 2) were compared to control groups under a natural photoperiod (NP). In a third trial (Trial 3), fish kept under either NP or LL conditions during the first year were subsequently assigned a treatment involving exposure to NP or a constant long photoperiod (LP) throughout the second year. The rates of spermiating males, gonadal size (GSI) and growth under all these photoperiod regimes were analyzed. Exposure to LL reduced the rates of precocity in all trials (<3%) at the end of year one as compared to NP (13-22%), but full spermiation was still observed in year two (Trials 1 and 2), indicating that LL is not efficient for blocking gametogenesis at this time. Fish exposed to LP in Trial 3 displayed high GSI values (April) and a significant delay in gonadal maturation (62.50-100%; May) with respect to those exposed to NP (12.5%), which enhances the potential growth of the fish. In summary, exposure to LL reduces precocity in underyearling fish, while LP delays maturation during the second year, thus providing a promising approach for controlling male sea bass reproduction and growth.

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Updating control of puberty in male European sea bass: A holistic approach

Cited by 32 publications

References 49 publications

Leptin receptor gene in the European sea bass (Dicentrarchus labrax): Cloning, phylogeny, tissue distribution and neuroanatomical organization

Leptin receptor gene in the European sea bass (Dicentrarchus labrax): Cloning, phylogeny, tissue distribution and neuroanatomical organization

High-quality spontaneous spawning in greater amberjack (Seriola dumerili, Risso 1810) and its comparison with GnRHa implants or injections

Effect of Combining Different Photoperiod Regimes on the Sexual Maturation of Male Sea Bass (Dicentrarchus labrax L.) During the First Two Years of Life

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