They manage their time well. If a half an hour in one spot is not getting them anywhere they study the situation, learn something from it and move on to a new locale. In fact the successful fisher might move on up to five times before succeeding, The best fishers are also the most experienced fishers. They have learned from their experiences and they take these learned experiences and place them in context and the result is knowledge and eventually wisdom. All this leads to further successes.
Good fishers are well trained.
They may be self-trained or a mentor or a friend may have trained them. Or they may even have been formally trained in one of the many fishing schools such as the Orvis School over in Vermont or the LL Bean school in Maine. In their training they learn all about their environment. They know about water, how it flows, whether it is high or low, what's in it, what's its temperature. They watch the insects and the birds to see what they are up to and why.