Jigs can also be fished under a small float or strike Indicator.  Using the float as a measurment of depth and maintaining the jig at that depth is deadly.  Very small jigs can be used in the 1/256 oz. range and in fly fishing measurments as small as size 14.  Rods for float jig fishing are usuall 7 to 10 ft. in length with a reel that has the ability to handle 6pound test line.  Depending on the depth of the water, a good rule of thumb is to have your leader from your float to the jig at least as deep as the water you are fishing.  Small carrot floats come in a varity of sizes and are most often used as the strike indicator.  Run you line thru the float to a Sampo swivel.  Peg the float directly above the swivel, using the swivel for weight to help throw the light rig.  I usually use a No. 5 Sampo.  Run a leader of fluracarbon from the float to the fly in either 2 or 4 pound test, depending on the size of the jig.  Extremely small size 12 and 14 jigs should use the lighter line.  Fish the jig near the bottom on a drag free drift.  By this I mean to keep any wake or current off the float, letting it drift freely.  Enough slack must be removed however to allow a hook set.  This is where the longer rods really come into play.  Bites and quick.  As the float goes under, sweep the rod upward in an even motion, not a quick snap or jerk.  Fish the jig and float in the same locations as stated above for the straight line jig.

Good Luck