In fishing the Orb as a Callibaetis nymph or emerger there are a couple observations I want to share. They are perhaps basic to the experienced flyfisher but if you are like me you are still wanting to learn, so here you go: the Callibaetis is light dependent. Penetrating light that fosters plant growth, that creates feed for the nymph and generates the emergence. It is, from my observations, important that you fish where light penetrates, whether ten feet or twenty feet, the penetrating stimulating action. I fish with two rods from a pontoon boat…not as easy when fishing from a tube. I string an Intermediate clear line and a WF floating line. The Intermediate carries the Orb or whatever subsurface fly I search with. The floater carries the dry or emerger. I can easily switch my approach/attack within a minute or so. If I were to only carry one rod or fish from a tube, I would be in the precarious position (which I have done many times) of switching spools. My advice re that: make sure the rod is balanced and remove the spool. Clutch with a grip equal to the spare spool + line’s cost and make sure that the rod is not tip heavy now minus the spool and slips off the edge. Put away the spool and only then secure the other spool you are going to put on. When stringing the line thru the guides make sure to not overly bend the tip while stripping the line up through to avoid breaking a graphite tip (I have done this twice). Operating as one does off the apron of a pontoon boat or float tube is always tenuous and spools, pliers, etc are easily lost.
Back to the Orb…fish it slow, fish is twitchy and seduce/trick/convince that fish. Imagery is everything to presentation..know enough about the emerging nymph and the hours long pre-emergence actions below the surface. Study all the articles on how insects move beneath the surface during pre-emerge or during the emergence and visualize/imagine that during your presentation. Basic, I know, but small details to enhance your experience.
search this site for additional posts re The Orb and Callibaetis by me. The Orb by Gary Muncy, May 2008.