Zaytsev, 1986



Citation


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 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 occured at 16-17 days] 165.0 °C * day
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 ] 5.15 mm
Thymallus thymallus Egg Oocyte diameter Average 2.5, range 2.0-3.0 [Unfertilized eggs] 2.5 mm
Thymallus thymallus Larvae Temperature during larval development 9.0-10.5°C 9.75 °C
Thymallus thymallus Larvae Reaction to light They have negative phototaxis, and search for contact with the ground and the shelter Photopositive
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
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