Bieniarz, K. and Epler, P. and Malczewski, B. and Passkas, T. (1981) Development of European eel (Anguilla anguilla L.) gonads in artificial conditions. Aquaculture, pp. 53-66
| Species | Development state | Trait | Primary Data | Secondary Data |
| Anguilla anguilla | Female | Length at sexual maturity | Gonadal sex differentiation in the >European eel is ot age dependent but seems to be partly correlated with body length and begins when the eels reach 14-35 cm in length | 24.5 cm |