Early spring tactics if the water is too cold for buzzer hatches

In this video i will be fishing for rainbow trout at my home water Lochenbreck Loch. As the water is still cold (9 degrees) and buzzers haven't started hatching with any vigor, therefore the trout are not feeding on or near the surface, I will be fishing with Squirmy worms under an indicator and the booby along the bottom on an 18 inch leader.