A Post-hatching Sub-gravel Stage in the Life History of the Arctic Grayling, Thymallus arcticus

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Abstract
Arctic grayling fry were not seen along shore or collected in traps set upstream and downstream of spawning areas until 4-5 days after fry were first observed in substrate samples. Fry were first captured in emergence traps 6 days after the first eggs had hatched in nearby substrate. Artificially incubated fry remained on the bottom of an incubating apparatus for 3 days before swimming to the surface. The yolk sac was absorbed during this interval. These observations indicate that Arctic grayling fry normally spend 3-4 days in the gravel substrate prior to emerging.

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