“Make your bottom fly the larva stage. Just above the fly imitating the larva stage, place your split shot. Larva live near the river bed, and by putting your split shot just above the larva, your fly will be where the real larva are living. Above the split shot, about halfway to your indicator, tie on a pupa imitation.” Don Oliver refers to Dave Whitlock’s Guide to Aquatic Trout Foods in advising beginners on fishing the San Juan. In the Farmington, New Mexico Daily Times.