I assume that when you say blackmouth you are refering to immature chinook in the salt. There is a small group of salmon fanatics who troll files for winter chinook out of Campbell River. They simply troll bucktail salmon flies on an unweighted fly line. They do not have any big numbers days, but do hook a few and they get to fish in relative solitude.

There was a fistion piece that talked about this fishey in Sporting Classics a couple of year ago. It was called "Winter's End"