The silvering process of Anguilla anguilla: a new classification from the yellow resident to the silver migrating stage

International audience The identification of five stages for female and two stages for male eels Anguilla anguilla using multivariate analysis was carried out on a large sample of individuals collected at six different locations in France. Stages corresponded to a growth phase (stages I and II), a p...

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Bibliographic Details
Main Authors: Durif, Caroline, Dufour, S., Elie, Pierre
Other Authors: Ecosystèmes estuariens et poissons migrateurs amphihalins (UR EPBX), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), Muséum national d'Histoire naturelle (MNHN)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2005
Subjects:
ARGENTAGE
GONADOTROPIN
[SDE]Environmental Sciences
Anguilla anguilla
Online Access:https://hal.inrae.fr/hal-02584161
https://doi.org/10.1111/j.1095-8649.2005.00662.x
Description
Summary:International audience The identification of five stages for female and two stages for male eels Anguilla anguilla using multivariate analysis was carried out on a large sample of individuals collected at six different locations in France. Stages corresponded to a growth phase (stages I and II), a pre-migrant phase (III) and two migrating phases (IV and V). It is likely that an important period of growth triggered silvering through the production of growth hormone (GH) in stage III eels. In migrating eels gonad development, gonadotropin hormone (GTH-II) production and increase of eye surface were similar at all sites. Differences among locations were found in gut regression and pectoral fin length. As variability for these increased with the size of the watershed and values were highest for the most downstream locations, fin length and gut regression may indicate the time since an eel started its migration.

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