Fly fishing tackle comprises the fishing tackle or equipment typically used by fly anglers. Fly fishing tackle includes:
Fly rods normally vary between 2 m (6 ft) and 4 m (13 ft) in length with the most common length sold being 2.74 m (9 ft). Rod lengths are typically given in imperial measurements of feet and inches. Fly rods and lines are designated as to their "weight", typically written as Nwt where 'N' is the number (e.g. 8wt, 9wt, 10wt).
Rods are matched to the line according to weight. The rod's manufacturer will mark on the rod the fly line weights for which a rod has been designed. One-weight (1wt) rods and lines are the lightest; the weight designations increase in whole number increments as the rod becomes heavier. The heaviest rods and lines readily available currently are 16-weight (16wt). In general, 1wt through 2wt rods would be used for the cast small flies for small trout and panfish; 3wt and 4wt rods are popular for small-stream fishing; 5wt is often considered the all-around rod for trout and general freshwater fishing; 6wt and 7wt rods are used on large rivers and for fishing with streamers, for larger warmwater species, and occasionally in calm inshore conditions for smaller saltwater species; 8wt to 9wt rods and lines might be used for steelhead or salmon in medium rivers, as well as for bass fishing with large flies, fishing for large carp, and general inshore saltwater use; and 10-11wt rods and lines would be used for pursuing large saltwater gamefish (tarpon, snook) under conditions of high wind or surf. The heaviest rods (12–16wt) are mostly used for bluewater species (billfish, tuna) while fishing from a boat. The characteristics of these rods reflect the fact that only short casts are needed during this type of fly fishing, while lifting ability is at a premium.
The species pursued, under which conditions, will largely determine the weight of rod selected. Next, it is important to match the line to the weight of the rod. Using too heavy a line on too light on a rod, or vice versa, will dramatically affect casting performance. It may also permanently warp the rod blank. Generally speaking, you can safely go one line weight more or less (i.e. using an 8wt or 10wt line on a 9wt rod). There are also rods stamped with a range of weights. For example, a rod may be rated 7-8wt. This indicates the rod is designed for either a 7 or 8 weight fly line. There are also some rods rated for wider ranges (e.g. 8-9-10wt). The drawback to multi-rated rods is that compromises in flexibility or action are made in order to accommodate a wider range of line weights. For example, a rod rated for 8-9 weight line will be slightly stiffer than a straight 8wt but slightly softer than a straight 9wt rod. In general, the more expensive the rod, the more likely it'll be designated for a single line weight rather than a range.