Kratt and Smith, 1977



Citation


No detailed citation.

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Thymallus arcticus Spawning conditions Spawning substrate Gravel: 5 mm to 76 mm in diameter Lithophils
Thymallus arcticus Spawning conditions Spawning site preparation The eggs are buried to a depth of 2-3 cm despite the absence of nest digging behavior Susbtrate chooser
Thymallus arcticus Spawning conditions Spawning period duration 3 [Spawning activity was observed on the east side outlet between May 19 and June 10, 1975 and peaked from May 23 to May 25. In 1976, spawning began on the east and west sides of the outlet on May 15 and May 18 respectively. Adult grayling were seen on the east spawing grounds until June 2 and on the west spawning grounds until June 8, 1976. The peak of spawning occured from May 25 to May 29 on the east side.] 3.0 weeks
Thymallus arcticus Egg Degree-days for incubation The eggs required 186.24 day-degrees to hatch. Also found that eggs reuqired 176.75 day-degrees to hatch at a mean daily temperature of 7.07°C 186.24 °C * day
Thymallus arcticus Egg Temperature for incubation Water temperatures ranged from 2.0 to 9.2°C during the incubation period in 1975. Temperature ranged from 1.0°C to 10.3°C on the west side and from 1.0°C to 11.5°C on the esat side in 1976. The mean daily temperature on the east side was 5.82°C 2.0 °C
Thymallus arcticus Spawning conditions Spawning season Spawning activity was observed on the east side outlet between May 19 and June 10, 1975 and peaked from May 23 to May 25. In 1976, spawning began on the east and west sides of the outlet on May 15 and May 18 respectively. Adult grayling were seen on the east spawing grounds until June 2 and on the west spawning grounds until June 8, 1976. The peak of spawning occured from May 25 to May 29 on the east side. ['May', 'June']
Thymallus arcticus Larvae Full yolk-sac resorption 60-70 [A post-hatching sub-gravel stage of 3 to 4 days'duration appears to be a normal feature of the life cycle of Arctic grayling in the Fond Lac River. The newly hatched fry possess large yolk sac wich are almost completely absorbed by the time they emerge. Also observed between 4-7 days at about 10°C] 65.0 °C * day
Thymallus arcticus Larvae Larvae behaviour A post-hatching sub-gravel stage of 3 to 4 days'duration appears to be a normal feature of the life cycle of Arctic grayling in the Fond Lac River Demersal