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Making the perfect cast when nymph fishing
By Mtangler from Bozeman, Montana, United States
Casting distance and angles are one of the most important components of a good presentation. Many fishermen mistakenly assume that they are adequately covering good trout water by simply having their flies in the feeding lanes. The reality is that the geometry of a cast has a lot to do with a good presentation an often is wasted when the length and angle of a cast does not permit the correct drift on the flies. The vast majority of wading fisherman that I guide step into a run without planning their approach and begin casting from one position to all of the good looking trout lies they can reach. A lot of my time guiding wade anglers in Montana is spent coaching them on the correct "setup" for their presentation. This involves wading into the correct location so that the first cast to the prime trout holding lie is going to produce the ideal presentation. By predetermining the ideal casting distance and angle for a given run and then wading into the correct location our clients begin to greatly increase their hookup rates. Here are a few examples of common water types with some basic strategies that produce ideal drifts.
Long, deep runs with uniform currents
I generally recommend making as short of a cast as possible when nymph fishing but he exception is when you are fishing long runs with uniform currents. On larger rivers trout often hold in 3-5 feet of water in large swift runs. Flies need some time to sink to these depths even with a copious amount of split shot. Short casts do not allow adequate time for the flies to sink and remain in the "money zone". In these situations making long casts at a 45 degree angle upstream is ideal. I try to make a powerful cast that I can "check" just above the water so that the flies tuck below the line and free fall quickly upon entering the run. As the flies drift towards you one or two big mends are needed to control the drift while some of the slack that is generated is retrieved. When the flies pass your location in the river you can feed some line back while mending to continue the drift. With this approach you should be standing about 10-15 feet away from the line of drift at its closest point to you directly across the current.
Complicated slicks on spring creeks
Smooth glassy slicks on spring creeks appear to look fairly simple with their drift lines, but upon careful inspection you will notice that the currents are actually complicated and occur with a variety of different speeds. If you make too long of a cast the line lays across too many lanes of current and drag results on the flies. If you cast too close the flies look great but you have spooked trout. A medium cast of 20-30 feet is usually ideal in these cases. The best drift angles to smart spring creek trout is generally made with a cast at a slightly downstream angle that permits the flies to reach the trout before the leader. When fishing under these technical conditions it is imperative to first identify the feeding lanes in the run and then slowly and carefully wade into a position across and slightly upstream of of the trout before making the perfect cast.
Our Montana fly fishing includes numerous water types, but swift water with rocks and boulders dispersed throughout is very common. The presence of numerous rocks also breaks the current up into a variety of different lanes of varying speeds. Trout in these locations often concentrate on the seams between the fast water in the main current and the slow eddy water behind rocks. Making long casts in these conditions results in nearly instant drag on the lies since the line is surely laying across numerous current lanes and getting pulled unevenly down the river. Fortunately trout in this fast and broken water are not that spooky allowing anglers to get as close as five feet in some cases without disturbing the fish. The ideal presentation under these conditions is to make short casts at a 45 degree angle upstream and then immediately lift the rod high to remove the fly line off of the water. This "high sticking" technique produces ideal drifts since drag is non existent. It is critical when high sticking to constantly change your body position so that you are located about seven to ten feet away from the productive seams that you target.
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