Zaytsev, 1986


Zaytsev, A.M. (1986) Embryonic-larval development of grayling, Thymallus thymallus, from Lake Ladoga. J. Ichthyol., pp. 123-32

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Thymallus thymallus Egg Oocyte diameter Average 2.5, range 2.0-3.0 [Unfertilized eggs] 2.5 mm
Thymallus thymallus Egg Egg size after water-hardening 2-8.3.0 is the diameter of the egg itself, but the diameter of the swollen eggs with the perivetlline space is 3.25-4.66 mm ] 3.96 mm
Thymallus thymallus Egg Incubation time 16-21 [9.0-10.5°C] 18.5 days
Thymallus thymallus Egg Degree-days for incubation 160-170 [Under the usual incubation conditions (9.0-10.5°C), mass hatching of lake grayling occurred at 16-17 days] 165.0 °C * day
Thymallus thymallus Larvae Initial larval size 10.9-11.1 11.0 mm
Thymallus thymallus Larvae Larvae behaviour Prolarvae concentrated in groups at the bottom in the corners on the trough, rarely mouving around Demersal
Thymallus thymallus Larvae Reaction to light They have negative phototaxis, and search for contact with the ground and the shelter Photopositive
Thymallus thymallus Larvae Temperature during larval development 9.0-10.5°C 9.75 °C
Thymallus thymallus Larvae Full yolk-sac resorption 130-150 [13-14 at 9.0-10.5°C] 140.0 °C * day
Thymallus thymallus Larvae Onset of exogeneous feeding 100-110 [10-11 days at 9.0-10.5°C] 105.0 °C * day