Synopsis
The time of initial feeding of Atlantic salmon,Salmo salar, alevins in ten geographically widespread Norwegian streams was estimated theoretically by combining data on spawning time and models describing the time from fertilization to hatching and from hatching to initial feeding at different temperatures. The point of initial feeding was correlated with water flow and water temperature regimes. Initial feeding was avoided in all rivers during spring peak flow, and before water temperature reached 8°C. Two different strategies were indicated: (1) initial feeding may take place before the culmination of the spring flow or (2) after the peak spring flow. The choice of strategy depends on temperature and flow regimes in each river.
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Jensen, A.J., Johnsen, B.O. & Heggberget, T.G. Initial feeding time of Atlantic salmon,Salmo salar, alevins compared to river flow and water temperature in Norwegian streams. Environ Biol Fish 30, 379–385 (1991). https://doi.org/10.1007/BF02027981
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DOI: https://doi.org/10.1007/BF02027981