GnRHa-mediated stimulation of the reproductive endocrine axis in captive Atlantic bluefin tuna, Thunnus thynnus

Rosenfeld, Hanna; Mylonas, Constantinos C.; Bridges, C.R.; Heinisch, Gilad; Corriero, Aldo; Vassallo-Aguis, R.; Medina, Antonio; Belmonte, Antonio; Garcı́a, Antonio G.; Gándara, Fernando de la; Fauvel, Christian; Metrio, G. De; Meiri-Ashkenazi, I.; Gordin, H.; Zohar, Yonathan

doi:10.1016/j.ygcen.2011.09.013

Cited by 40 publications

(33 citation statements)

References 50 publications

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“…In addition, different from most South American rheophilic species, viable embryos and successful ovulation can be unusually obtained with very low doses of CPE (0.5mg kg -1 (with successive doses every six hours, if necessary)) in Schizodon fasciatus (Lopes and Leal, 2010). Taken together, these findings indicate that L. elongatus, as well as other South American migratory species, do not respond properly (due to completely unknown reasons) to hormonal induction, especially with GnRH, which provides inconstant and very heterogeneous results of difficult reproducibility, especially if we consider that the doses applied in this study (3.5 or 5.0 μg mGnRH kg -1 + 10 mg kg -1 metoclopramide) and for the congener L. macrocephalus (7 μg mGnRH kg -1 + 10 mg kg -1 metoclopramide) which did not provide viable embryos either (Pereira et al, 2017) were much lower than the GnRHa-implant doses reported as a cause for overstimulation in other fish species (50-100 kg -1 ) (Mañanos et al, 2002;Rosenfeld et al, 2012).…”

Section: Discussionmentioning

confidence: 86%

Leporinus elongatus induced spawning using carp pituitary extract or mammalian GnRH analogue combined with dopamine receptor antagonists

Pereira¹,

Boscolo²,

Moreira³

et al. 2017

Anim Reprod

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Several studies have been developed to support the replacement of the crude carp pituitary extract (CPE) by synthetic products for induced reproduction of South American rheophilic species. However, results have been quite heterogeneous and there is no consensus or a routine use of synthetic products in these species. Thus, the aim of this study was to evaluate the ovulatory process in L. elongatus using different protocols of hormonal induction. Thus, fifteen wild mature females maintained at the Experimental Fish Station, Salto Grande, SP, Brazil were submitted to three different hormonal treatments: CPE (fractioned dose: 0.5 and 5.0 mg kg -1 ); mGnRHa (single dose: 3.5 µg kg -1 ) and mGnRHa (single dose: 5.0 µg kg -1 ). The spawning rate and absolute fecundity were similar among the treatments, but fertility rates were higher for CPE treatment (23.60 ± 9.40) then for mGnRHa treatments (close to or zero zero). Although females ovulated in all treatments, none of them provided viable embryos, showing hatching rates close to zero or zero. Both mGnRHa treatments were more potent for inducing the ovulatory process then CPE treatment, which was evidenced by the fact that the formers showed higher volume density of postovulatory follicles (POF). Accordingly, E 2 and 17α-OHP plasma levels were higher for the mGnRHa treated females compared to the CPE one at the time of ovulation. In this study we confirmed previous scientific evidence that, regardless of whether promoting ovulation, the use of conventional CPE and GnRH doses are not appropriate for some South American migratory species, due to the nonattainment of viable embryos. Moreover, we have brought new information about the relationship between reproductive performance and gonadal steroids concentrations using different hormonal therapies, contributing to understand the reasons for Leporinus elongatus embryo loss in induced spawning.

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Section: Discussionmentioning

confidence: 86%

Leporinus elongatus induced spawning using carp pituitary extract or mammalian GnRH analogue combined with dopamine receptor antagonists

Pereira¹,

Boscolo²,

Moreira³

et al. 2017

Anim Reprod

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“…Production of low amount of expressible semen in males [103], as well as reduction of germ cell proliferation and increase of apoptosis [20, 104] has been reported in captive-reared male fish. Atresia of vitellogenic oocyte and failure to undergo oocyte maturation have been attributed to an insufficient pituitary luteinizing hormone (LH) release, and to the consequent steroid withdrawal, occurring in captive conditions [105, 106]. These dysfunctions have been associated to a combination of factors, such as captivity-induced stress, lack of appropriate spawning environment and nutritional deficiencies (an exhaustive review on reproductive dysfunctions, their causes and therapeutic treatments is provided by Zohar and Mylonas [103] and Mylonas et al [96]).…”

Section: Discussionmentioning

confidence: 99%

Comparative Study of Reproductive Development in Wild and Captive-Reared Greater Amberjack Seriola dumerili (Risso, 1810)

et al. 2017

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The greater amberjack Seriola dumerili is a large teleost fish with rapid growth and excellent flesh quality, whose domestication represents an ambitious challenge for aquaculture. The occurrence of reproductive dysfunctions in greater amberjack reared in captivity was investigated by comparing reproductive development of wild and captive-reared individuals. Wild and captive-reared breeders were sampled in the Mediterranean Sea during three different phases of the reproductive cycle: early gametogenesis (EARLY, late April-early May), advanced gametogenesis (ADVANCED, late May-early June) and spawning (SPAWNING, late June-July). Fish reproductive state was evaluated using the gonado-somatic index (GSI), histological analysis of the gonads and determination of sex steroid levels in the plasma, and correlated with leptin expression in the liver and gonad biochemical composition. The GSI and sex steroid levels were lower in captive-reared than in wild fish. During the ADVANCED period, when the wild greater amberjack breeders were already in spawning condition, ovaries of captive-reared breeders showed extensive atresia of late vitellogenic oocytes and spermatogenic activity ceased in the testes of half of the examined males. During the SPAWNING period, all captive-reared fish had regressed gonads, while wild breeders still displayed reproductive activity. Liver leptin expression and gonad proximate composition of wild and captive greater amberjack were similar. However, the gonads of captive-reared fish showed different total polar lipid contents, as well as specific lipid classes and fatty acid profiles with respect to wild individuals. This study underlines the need for an improvement in rearing technology for this species, which should include minimum handling during the reproductive season and the formulation of a specific diet to overcome the observed gonadal decrements of phospholipids, DHA (22:6n-3) and ARA (20:4n-6), compared to wild breeders.

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“…Since the implementation of the moratorium on directed fishing for ABFT in the GMX, federal fisheries observers have sampled ABFT caught as bycatch in the yellowfin tuna and swordfish longline fisheries ( Thunnus albacares and Xiphias gladius , respectively). Such restrictions prevent comprehensive size sampling of spawning ABFT in the GMX and hinder the determination of the spatial and temporal extent of western spawning [31].…”

Section: Discussionmentioning

confidence: 99%

Comparative Assessment of the Reproductive Status of Female Atlantic Bluefin Tuna from the Gulf of Mexico and the Mediterranean Sea

et al. 2014

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Despite attention focused on the population status and rebuilding trajectory of Atlantic bluefin tuna (Thunnus thynnus), the reproduction and spawning biology remains poorly understood, especially in the NW Atlantic. At present, the eastern and western spawning populations are believed to exhibit different reproductive characteristics and, consequently, stock productivity. However, our study suggests that the two spawning populations, the Gulf of Mexico and the Mediterranean Sea, could show similar reproductive features and spawning strategies. Between 2007 and 2009, gonad samples from female Atlantic bluefin tuna were collected in the northern Gulf of Mexico (n = 147) and in the western Mediterranean Sea (n = 40). The histological and stereological analysis confirmed that sampled eastern and western bluefin tuna exhibit the same spawning duration (three months) but the spawning in the Gulf of Mexico begins one month earlier than in the Mediterranean Sea. Western bluefin tuna caught in the peak of the spawning season (May) showed a similar spawning frequency (60%) to the spawning peak observed in the Mediterranean Sea (June). Fecundity for the Gulf of Mexico fish () was lower but not significantly different than for fish sampled in the Mediterranean Sea (). Our study represents the first comparative histological analysis of the eastern and western spawning stocks whose findings, combined with new determinations of size/age at maturity and possible alternative spawning areas, might suggest basic life history attributes warrant further scientific and management attention.

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GnRHa-mediated stimulation of the reproductive endocrine axis in captive Atlantic bluefin tuna, Thunnus thynnus

Cited by 40 publications

References 50 publications

Leporinus elongatus induced spawning using carp pituitary extract or mammalian GnRH analogue combined with dopamine receptor antagonists

Leporinus elongatus induced spawning using carp pituitary extract or mammalian GnRH analogue combined with dopamine receptor antagonists

Comparative Study of Reproductive Development in Wild and Captive-Reared Greater Amberjack Seriola dumerili (Risso, 1810)

Comparative Assessment of the Reproductive Status of Female Atlantic Bluefin Tuna from the Gulf of Mexico and the Mediterranean Sea

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