Stock assessment and exploitation of Atlantic salmon Salmo salar L. in the river Drammenselv
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Abstract
In 1985 the total salmon run and the exploitation rate in the river Drammenselv were estimated by combining catch statistics, counts of ascending salmon in a salmon ladder at Hellefoss, and a tagging-recapture experiment of the spawning stock below the ladder. The total run was estimated to 3028 individuals. The exploitation rate above the ladder was 0.04, which is a minimum estimate. Below the ladder the estimated exploitation rate was 0.33. The relatively low exploitation of the salmon stock in the river Drammenselv is probably one of the main factors responsible for the rapid increase in this salmon population.
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