Try 01738 451111 for Perth office.
Alternatively you could enquire at the Inverlodge Hotel (not sure if they do permits for non-residents).
There is also salmon and sea trout fishing on lochs and other sections of river. Go to places to Fish section and select salmon and sea trout from the Angling Groups drop down.
http://www.assyntanglinginfo.org.uk/?q=location%2Fviews&tid=10&tid_1=All&tid_2=All
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