Winnicki, A. and Stankowska-Radzium, M. and Radzium, K. (1970) Structural and mechanical changes in the egg membranes of Salmo gairdneri Rich. during the period of hatching of the larvas. Acta Ichthyologica et Piscatoria [ACTA ICHTHYOL. PISC.], pp. 7-20
| Species | Development state | Trait | Primary Data | Secondary Data |
| Oncorhynchus mykiss | Egg | Egg size after water-hardening | Diameter of egg in the day of hatching ranged from 5.26 to 5.54 | 5.26 mm |