- Weighted nymphs and streamers are best. The usual way to weight a nymph is to add a few wraps of lead wire underneath, or you can actually buy lead substitutes now. Some more contemporary fishers with tell you this tip flattens the action of the fly in the water.
- Beadhead patterns are best. A tungsten or steel bead will also assist a fly sink in the water column, also acting as an attractor which can create a wiggling motion to a retrieved fly. Tungsten is heavier and will help a fly sink quicker.
- Put a split shot or weighted putty on your leader. There are various ways to add weight - where to place the weight on the leader, how much weight to use - however the biggest tip to remember is that you shouldn't use so much weight that you can't tell when you get a strike.
- Use lighter, thinner leaders and tippets. Fluorocarbon sinks better than monofilament, but a thinner tippet can will really boost your sink rate, simply because there is less drag. Rather than just putting more weight on, try shifting from 4x to 5x or 6x.
- Make sure you cast upstream of your target. You should aim to place your fly close to the bottom as it enters the trouts' strike zone, casting upstream to ensure the fly has time to reach the right depth. The speedier the current and the deeper the water, the farther upstream you'll have to cast.
- Fish nice and close. The more line you have on the water, the more drag there will be on your fly, stopping it from sinking at maximum speed. Many nymphing experts fish with almost no fly-line on the water at all.
- Lengthen your leader. The longer your leader, the less fly line you'll need on the water.It's that simple.
- Don't worry about the strike indicator. A buoyant strike indicator may enable better sight lines when a fish takes your fly, but it can also stop the fly from actually reaching the fish. Many anglers say that a sensitive rod tip and close presentation enables a better strike with no indicator.
- Insist on a sinking-tip line. This expert technique is normally employed with big stonefly nymphs in riffled water or with streamers. The important thing to remember in presenting a nymph with a sinking-tip line is keeping a semi-tight line... this makes sure you'll feel any strike.
- Use a Tuck Cast. A tuck cast makes your flies land first, which means the flies penetrate the surface and carry on to the bottom without the line and leader preventing the descent. Tuck casts are awesome for fishing nymphs upstream to the head of a pool.
The age-old fishing riddle, answered right here.
The biggest question in nymphing is: "How much weight should I use?". But there's no easy answer. Because the thing is, when fishing subsurface you can't see what's going on down there... but thankfully there methods to making informed estimations that keep your flies in the right place.