Beullens, K. and Eding, E.H. and Ollevier, F. and Komen, J. and Richter, C.J.J. (1997) Sex differentiation, changes in length, weight and eye size before and after metamorphosis of European eel (Anguilla anguilla L.) maintained in captivity. Aquaculture, pp. 151-162
| Species | Development state | Trait | Primary Data | Secondary Data |
| Anguilla anguilla | Female | Length at sexual maturity | Female silver: mean 63.10 ± 1.22, range 53.10-79.50 | 63.1 cm |
| Anguilla anguilla | Female | Weight at sexual maturity | Female silver: mean 0.58 ± 0.03, range 30.9-83.0 | 0.58 kg |
| Anguilla anguilla | Male | Length at sexual maturity | Male silver: mean 42.03 ± 0.29, range 35.10-58.20 | 42.03 cm |
| Anguilla anguilla | Male | Weight at sexual maturity | Male silver: mean 0.168 ± 0.004, range 0.077-0.409 | 0.17 kg |