Of much more importance than pattern of fly is how the flies are fished on the lake. The most effective way is to cast a reasonably long line of some twelve to fifteen meters. The file are retrieved in steady pulls till the water in which the leader was lying has been fished through. Another cast is then made, slightly to one side of the previous cast.
Sometimes the top dropper is worked along the surface. At other times the flies are worked deeper and drawn through the water and then lifted up out of it. Sometimes one method works and sometimes the other.
And so it continues, fishing the water in a fan in front of the boat. The reason for only fishing the length of the leader is firstly because sea trout seem to take better at a distance from the boat. Secondly the fly line seems to have a disturbing effect on them. When a trout takes, the best advice is to strike it quickly on the take.
And remember sea trout are shy creatures. Always remain seated while in the boat and avoid noisy splashing or movement of oars.