I will be the dissenting voice here, and get back on my soapbox to say that, if you are angling by yourself, is generally inappropriate to take pictures of fish that you intend to release . Sure, there are exceptions...you have a large net or cradle and can suspend the fish boatside in the water, or you have a camera on the shore with a remote shutter and can lift the fish out of the water for a quick remote pic. And yes, some aware anglers can take their own hero shots with minimal fumbling and no harm to the fish
However, most selfies I see are of wild fish lying on the shore, or half in/half out of the water, while the angler artfully poses it with his rod, retreives the camera from his pocket gets the right angle, takes the pic, returns the camera to the pocket, then releases the fish.
For what? Bragging rights? Your ego?... Keep the fish in the water, and release it asap. Record the image in your memory, not a chip.