A picture is truly worth a thousand words. Pictures will provide memories of the experience and data about your catch. Since all mobile phones contain a camera these days, there isn't any reason not to take plenty of pictures as long as you can do so safely. If you can, include the lure/rig that you were using in the picture. The date is automatically stamped on the picture file when stored in your phone and some phones will even stamp the location if you allow it to do so. If you ever loose your fishing log, you can go back to the pictures to gather valuable information. One word of caution, most phones or cameras don't do well if accidentally dropped into the water so make sure they are kept dry and secure.