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Endocrine profiles during silvering of the European eel (Anguilla anguilla L.) living in saltwater

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The transformation of yellow eel into silver eel is called 'silvering', and takes place prior to migration. This is the first study to provide hormonal profiles of European eel (Anguilla anguilla L.) during silvering. This transformation occurs in association with hormonal surges of testosterone (T) and estradiol (E2) but not with thyroid hormones (TH) and growth hormone (GH) which have a maximum activity in spring and a minimum activity in summer and autumn. It is therefore suggested THs and GH are not important for eel gonadal development in the autumn. Based on PCA analysis with physiological, morphological and endocrinological parameters it is concluded that the transition is gradual and that eels go through several stages.

Affiliations: 1: Integrative Zoology, Institute Biology Leiden (IBL), van der Klaauw Laboratorium, P.O. Box 9511, 2300 RA Leiden, The Netherlands; 2: Institute of Marine Research, 5392, Storebø/Centre for Ecological and Evolutionary Synthesis, University of Oslo, P.O. Box 1066, Blindern 0316 Oslo, Norway; 3: Museum National Histoire Naturelle (MNHN), Paris, France; 4: Section Toxicology, Wageningen University, P.O. Box 8000, 6700 EA Wageningen, The Netherlands; Wageningen IMARES, Haringkade 1, 1976 CP Ijmuiden, The Netherlands


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