Chelkowski, Z. and Domagala, J. and Trzebiatowski, R. and Wozniak, Z. (1985) The effect of the size of sea trout (Salmo trutta L.) females from Rega river upon the size of eggs. Acta Ichthyologica et Piscatoria [ACTA ICHTHYOL. PISC.], pp. 37-71
| Species | Development state | Trait | Primary Data | Secondary Data |
| Salmo trutta fario | Egg | Egg size after water-hardening | Range of diameters of swollen eggs of sea trout from Rega river at 4.5-5.45 mm. In this study the values found were 4.3-5.7 mm | 4.97 mm |