Would a trout be better off if we didn’t take its picture? Sure it would. Moreover, wouldn’t a trout be better off if we didn’t set a hook in its mouth and drag it through the water? Yup. So I think we have to be a little careful how self-righteous we get. Point is, we all draw the line somewhere, and I firmly believe that a quick picture, taken responsibly (I’ll get to that), won’t hurt a trout.
Most of the fishermen I know who’ve spent a great deal of time with their boots in the water have caught on to catch and release. The bare facts stare you in the face pretty quickly if you start keeping your limit on every trip. You soon realize that a good fisherman can thin out a stretch of water in short order, and a group of good fishermen can probably take down an entire watershed.
So we take pictures instead . . .