Examples of this use include in Gudbrandsdalslågen, Numedalslågen, and Suldalslågen.
Numedalslågen is known for being a good location for salmon fishing, although a parasite known as Gyrodactylus salaris has recently been found in Numedalslågen that may pose a threat to its salmon stock.
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Among the other fish species of Numedalslågen are trout, eel, and pike.