Acou, A. and Lefebvre, F. and Contournet, P. and Poizat, G. and Panfili, A. and Crivelli, A.J. (2003) Silvering of female eels (Anguilla anguilla) in two sub-populations of the Rhone Delta. Bulletin francais de la peche et de la pisciculture [Bull. Fr. Peche Piscic.]., pp. 55-68
| Species | Development state | Trait | Primary Data | Secondary Data |
| Anguilla anguilla | Female | Length at sexual maturity | Metamorphosis occurred between 40-75 cm | 57.5 cm |
| Anguilla anguilla | Female | Resting period | About 0.6 ± 0.28 for the yellow stage and 1.78 ± for the silver stage | 0.6 months |