You can't base it on the anal fin if the anal fin isn't visible.
All the channels we catch are a dark grey.
Regardless the adipose gives it away and its visible for your viewing pleasure. Wh don't you just compare it to a picture of one of the 50+ fish you caught? Its anglers like this that drive me nuts talk a big game about their catch but can't even properly ID it. I can only imagine what a trout or lmb looks like to you. That's where I'm leaving this at.