Dictionaries of wet/dry flies contain thousands of different patterns and dressings. To fish for sea trout successfully, it is necessary to have a range of wet and dry fly patterns. But which ones? A casual observance of angling reports and fishing records tends to show that certain flies are mentioned more often than others and obviously these are the flies that caught the fish. However, one expert may claim that particular fly is a killer. That may be so, fished by him and his way.
But for others, it may fail. The problem is that angling is not an exact science. In reaching conclusions in science, experiments must be conducted and repeated in absolutely identical conditions. This is almost impossible in fishing because conditions are always variable and this will affect the behaviour of fish. All that we can be sure of are some general rules that long experience has to work in average situations.