The Loopwing blue-winged olive imitates the baetis mayfly. The loopwing on this fly is very effective with imitating the small wing of a mayfly. Give this fly a try!
Used a size 20 in the upper owen rivier last year. The rainbows were eating small top water caddis and this worked when other small adams patterns did not. I plan to try this pattern in the San Jacquin river as well.