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Influence of temperature regime on endocrine parameters and vitellogenesis during experimental maturation of European eel (Anguilla anguilla) females |
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| Authors: | Pérez L Peñaranda D S Dufour S Baloche S Palstra A P Van Den Thillart G E E J M Asturiano J F |
| Institution: | a Grupo de Acuicultura y Biodiversidad, Instituto de Ciencia y Tecnología Animal, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain b Laboratoire de Biologie des Organismes et Ecosystèmes Aquatiques, UMR CNRS 7208, IRD 207, UPMC, Muséum National d’Histoire Naturelle, 75231 Paris Cedex 05, France c Molecular Cell Biology, Institute of Biology, Leiden University (IBL), Sylvius Laboratory, Wassenaarseweg 72, 2333 AL Leiden, The Netherlands |
| Abstract: | We examined the effect of temperature in European silver eels during their maturation induced by injections of carp pituitary extract on endocrine parameters: pituitary fshβ and lhβ expression, plasma 17β-estradiol (E2) and vitellogenin, estrogen receptor 1 (esr1), and vitellogenin 2 (vtg2) expression in liver. A variable thermal regime (T10) that increased from 10° to 14° and 17 °C was compared with a constant 20 °C regime (T20) during 12 weeks. T10 caused a faster development until week 8, higher fshβ, lhβ, esr1 expression, and higher E2 levels. The results strongly suggest that T10 is inducing a higher endogenous FSH level which increases the E2 circulating level during vitellogenesis. A variable thermal regime induced an fshβ expression and E2 profile in vitellogenic hormonally matured eel females that were more similar to the profile observed in other naturally maturing fish. |
| Keywords: | Eel Temperature Vitellogenesis fshβ lhβ E2 esr1 vtg2 mRNA |
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