David: I think I know your Arctic char from a few high lakes in Idaho's Sawtooth Mountains. After a rich history, dating back to the 1920's, the Idaho Fish & Game Dept. spends taxpayer money flying baby fish into high mountain lakes, that for the most part, do not offer "sustainable fisheries." Which is to say, the lakes offer no place for the fish to spawn & produce future generations.
But it gets done to promote tourism & only a few Ludite whiners chose to "carp" about it.
We found Arctic Grayling, which look like Arctic Char, but have a slight genitic difference, in a somewhat scenic lake under this peak, back in 2009. We caught a few, but. per our "catch & release" ways, we let them go.
Me, playing a Char/grayling.