Incubation of Eggs of Atlantic Salmon (Salmo Salar) from Different Norwegian Streams at Temperatures below 1 °C

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Abstract
Atlantic salmon (Salmo salar) eggs obtained from fish from five widely separated localities were incubated from fertilization until hatching at mean temperatures of 1.0 and 0.17 °C. The results indicate that an existing model used to predict time of hatching in Atlantic salmon at temperatures greater than 2 °C can also be applied for lower temperatures. The eggs hatched 250–260 d after fertilization at mean temperatures of 0.15–0.17 °C (38–44 day-degrees) and after 206–221 d at temperatures of 0.97–1.03 °C (205–214 day-degrees). There was no evidence of stock adaptation or of within stock adaptation to temperature at any of the different localities during the period from fertilization to hatching.