Penaz and Prihoda, 1981



Citation


Penaz, M. and Prihoda, J. (1981) Reproduction and early ontogeny of Hucho hucho. Acta Sci. Nat. Acad. Sci. Bohemoslov (Brno), pp. 1-33

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Hucho hucho Spawning conditions Spawning temperature When the water temperature, at least during the day, exceeds 8°C 8.0 °C
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 Female Relative fecundity Relative fertility of 1095 to 3330 pieces 1095.0 thousand eggs/kg
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 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 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
Oncorhynchus keta Egg Egg size after water-hardening 7.3-7.5 [Not specified] 7.4 mm
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 4.875 mm
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 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 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 Female Age at sexual maturity Danubian salmon in pond culture achieve sexual maturity in the 6th-8th year of life 6.0 year