If you find yourself in a situation where you need to start fishing, you may be in for a longer stay than anticipated. That being said....fishing gives you something to do. You may, or may NOT, catch anything-but, you are DOING something-it focuses your mind on the task at hand. In a survival situation, waiting to be rescued, you are, literally, waiting. Largely doing nothing. So, fishing can take you away from that. It isnt always the physical value of an item in there-sometimes, the benefit comes from the activity-not the end results.