March Brown Spider - Soft Hackle. When there is no dominant hatches occurring the March Brown Spider is the only option. A fantastic searching pattern, cast the Spider March Brown into a slightly faster stretch of water and leave on a loose drift and this imitation will look so lifelike that any nearby trout will devour this fly. This fly has been used by our hand picked team in Washington State, California, British Columbia, Alberta, Ontario and Alaska to great success.