Abstract
By utilizing a unique freshwater/seawater mixing zone in Iceland, it is shown that maturing salmon returning from the ocean will not enter a freshwater body unless salmon fry or smolts are present in that very same body of water. This confirms Nordeng's hypothesis regarding the importance of “smell” or pheromones for local orientation of salmon. The observations under consideration, at the same time, seem to contradict Nordeng's hypothesis regarding the impact of smolts on homeward migration of salmon.
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