Penaz, M. and Prihoda, J. (1981) Reproduction and early ontogeny of Hucho hucho. Acta Sci. Nat. Acad. Sci. Bohemoslov (Brno), pp. 1-33
| Species | Development state | Trait | Primary Data | Secondary Data |
| Hucho hucho | Egg | Oocyte diameter | Their equatorial diameter was on average 3.95. In fish farm, found mean size of unswollen eggs 4.4-5.35 mm | 4.88 mm |
| Hucho hucho | Egg | Egg size after water-hardening | In our case swelling of the eggs began c. 30 min. after activation and went on intensively for 2 hrs., when the average egg size reached 4.32 mm, though slower swelling and an increase in egg size continued for the first three days of incubation up to a size of 4.55 mm | 4.32 mm |
| Hucho hucho | Egg | Egg adhesiveness | The stickiness of the chorion is very low and disappears in washing | Adhesive |
| Hucho hucho | Egg | Incubation time | The beginning was on the 31st day, mass hatching begining on the 32nd day, and hathcing finishing on the 34th day at an average temperature of 9.25°C | 31.0 days |
| Hucho hucho | Egg | Temperature for incubation | The temperature during the 32-day incubation period fluctuated in the range 4.8-15.5°C | 10.15 °C |
| Hucho hucho | Egg | Temperature for incubation | Average water temperature of 9.25°C | 9.25 °C |
| Hucho hucho | Egg | Degree-days for incubation | The beginning was on 285.5 DD, mass hatching begining on the 301DD, and hathcing finishing on the 331DD at an average temperature of 9.25°C | 285.5 °C * day |
| Hucho hucho | Larvae | Initial larval size | The average length of freshly-hatched embryos was 14.1 mm | 14.1 mm |
| Hucho hucho | Larvae | Larvae behaviour | After hatching they mostly remain motionless at the bottom of the trough, lying sideways on the yolk sac | Demersal |
| Hucho hucho | Larvae | Temperature during larval development | Incubated at 15°C | 15.0 °C |
| Hucho hucho | Larvae | Sibling intracohort cannibalism | The year's cultivation is removed at the end of August or the beginning of september, since cannibalism considerably increases at this time, which can account for half the population in a month | Present |
| Hucho hucho | Larvae | Full yolk-sac resorption | 545 (less than 287.6-339.1 for incubation) yolk sac has disappeared, exlusively external nutrition | 313.35 °C * day |
| Hucho hucho | Larvae | Onset of exogeneous feeding | 457-545 DD (less than 287.6-339.1 for incubation) mixed nutrition | 501.0 °C * day |
| Hucho hucho | Female | Age at sexual maturity | Danubian salmon in pond culture achieve sexual maturity in the 6th-8th year of life | 6.0 year |
| Hucho hucho | Female | Relative fecundity | Relative fertility of 1095 to 3330 pieces | 1095.0 thousand eggs/kg |
| Hucho hucho | Female | Absolute fecundity | Useful fertility 12500-22500 pieces | 17500.0 thousand eggs |
| Hucho hucho | Spawning conditions | Spawning season | The ripening of the sexual products of Danubian salmon takes place in the spring months, especially in the second half of April and first half of May | ['April', 'May', 'June'] |
| Hucho hucho | Spawning conditions | Spawning temperature | When the water temperature, at least during the day, exceeds 8°C | 8.0 °C |
| Oncorhynchus keta | Egg | Egg size after water-hardening | 7.3-7.5 [Not specified] | 7.4 mm |