Controlled reproduction in the wild European eel (Anguilla anguilla): two populations compared

Mordenti, Oliviero; Biase, Andrea Di; Bastone, Giuseppe; Sirri, Rubina; Zaccaroni, Annalisa; Parmeggiani, Albamaria

doi:10.1007/s10499-012-9611-8

Cited by 38 publications

(49 citation statements)

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“…, where the MV stage was reached after a mean accumulation of 987 ºD or 1172 ºD , Vílchez et al 2013, while the LV stage was the dominant stage after an accumulation of 1680 ºD, although not observed after 1220 ºD. Also, Mordenti et al (2013) observed LV stages in CPE-treated European eels after an accumulation of 1628 ºD (our own calculations, Table 4), but not after 1085 ºD.…”

Section: Temperature Modulates the Progression Of Vitellogenesissupporting

confidence: 52%

“…Vílchez et al (2013) were calculated from our original data. Mordenti et al (2013) was estimated from the data provided in Mordenti et al (2013). , where the MV stage was reached after a mean accumulation of 987 ºD or 1172 ºD , Vílchez et al 2013, while the LV stage was the dominant stage after an accumulation of 1680 ºD, although not observed after 1220 ºD.…”

Section: Temperature Modulates the Progression Of Vitellogenesismentioning

confidence: 99%

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Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels

Mazzeo¹

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RESUMENLa población de anguilla europea (Anguilla anguilla L., 1758) está sufriendo una drástica reducción. A su vez se trata de una especie muy apreciada por el mercado y su ciclo reproductivo no se ha podido cerrar puesto que esta especie no madura en cautividad. Por estas razones, hasta el momento, la producción global de anguila recae sobre las poblaciones naturales. Todos estos factores hacen urgente el cierre del ciclo productivo y para ello es necesario comprender la fisiología reproductiva y las razones de su imposibilidad de madurar en cautividad.Con la presente tesis, se pretende aportar mayores conocimientos sobre la fisiología reproductiva en hembras de anguila europea maduradas hormonalmente Para alcanzar este objetivo, se analizó la expresión de los genes: cyp19a1, ara, arb, gnrhr1a, gnrhr1b, gnrhr2, zpb and zpc, en animales bajo el regimen térmico comunemente utilizado. Por último se quiso evaluar el efecto de la temperatura sobre la vitelogenesis tanto sobre la expresión génica como en el perfil de esteroides (T,. De hecho, la anguila europea cuando migra al mar de los Sargazos para reproducirse experimenta un regimen térmico desde temperaturas más bajas a más altas.Tradicionalmente en acuicultura las anguilas se han madurado a temperatura constante y relativamente alta lo que podría afectar a la vitelogenesis y la calidad final de los oocitos.Para este estudio fue necesario la clonación y caracterización de nuevos genes. Su expresion genica fue estudiada por qPCR tras el diseño de los primers. El perfil esteroidogénico fue analizado por immunoensayos y los estados de desarrollo gonadal se calsificaron histológicamente.Como primer resultado se obtuvieron la secuencia para 6 genes en anguila europea. El análisis de la expresión génica permitió comprender la función de algunos de los genes estudiados a lo largo de la vitelogénesis (arb, gnrhr1b and gnrhr2) en diferentes regiones del cerebro.La temperatura se confirmó como un factor crucial durante la vitelogénesis. Por un lado, las anguilas sometidas a bajas temperaturas al inicio de la vitelogenésis mostraron mejores parámetros reproductivos, los cuales podrían tener un efecto en la calidad final de los oocitos. Por otra parte, temperaturas más altas son indispensables para alcanzar los estadios más avanzados de la vitelogenesis. ABSTRACTEuropean eel (Anguilla anguilla, L., 1758) is suffering a strong population decrease and at the same time it is a very appreciated species and by now it has not been possible closing its cycle life. In fact, this species does not mature in captivity unless hormonally induced. So all the production is up to the natural population. All these factors together make urgent achieving the closing of the productive cycle and for this aim it is important to understand the reproductive physiology and the reasons of this development blockage.The present thesis wants to be a new contribution to the knowledge of reproductive physiology in female European eel submitted at hormonal treatment. To achieve this goal, expressio...

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Section: Temperature Modulates the Progression Of Vitellogenesissupporting

confidence: 52%

Section: Temperature Modulates the Progression Of Vitellogenesismentioning

confidence: 99%

Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels

Mazzeo¹

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“…After week 12, a much larger GSI increase was observed in females kept at higher temperatures. Moreover, Mordenti et al, (2013) showed that temperatures below 20°C are more suitable for the stimulation of eel females. The findings of this study are similar.…”

Section: Discussionmentioning

confidence: 99%

“…Of the two temperatures applied in the experiment, 15°C seems the most suitable if the thermal protocol of reproduction is to maintain a constant temperature. However, it seems that during the final gamete maturation, water temperature should be raised by 2 -3°C (Pérez et al, 2011;Mordenti et al, 2013). Also, the simple markers for oocyte quality, such as percentage of transparent eggs or percentage of floating eggs showed that the lowest tested temperature (15°C) resulted the highest egg quality.…”

Section: Discussionmentioning

confidence: 99%

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Kucharczyk¹,

Czarkowski²,

Nowosad³

et al. 2016

Turk. J. Fish. Aquat. Sci.

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This study determined the optimum thermal conditions to induce gonad maturity in female The aim of the study was to verify which of the three studied water temperatures: 15ºC, 18ºC or 21°C is the most suitable for inducing gonad maturation and reaching maturity by the female European eel. The thermal regime during the period of female eel maturation should be established nearly individually, depending on the degree of maturation of spawners and it should be lower than that proposed until recently. The study found that 15°C is the best temperature to bring females of European eel to maturity. Excessively high temperatures were found to cause accelerated gonad maturation and to result in a lower oocyte quality. Moreover, the fish kept at higher temperatures (18ºC, 21°C) consume their energy resources (for example, for formation of gonads) faster than those kept in water at 15°C. The highest quality was noted for eggs obtained from females kept at lowest tested temperature.

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Chapter 14 Improvements on the Reproductive Control of the European Eel

Asturiano

2020

Reproduction in Aquatic Animals

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Controlled reproduction in the wild European eel (Anguilla anguilla): two populations compared

Cited by 38 publications

References 50 publications

Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels

Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels

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Chapter 14 Improvements on the Reproductive Control of the European Eel

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