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The equipment
Canes
To fish properly, I use two types of rod. The first is a very short, light rod, generally 7'6 with a 3 line, which allows me to fish the high altitude streams heading towards the Amazon. In these rivers, the trout are generally small and numerous. What's more, these are small rivers, sometimes with steep gradients. In these conditions, there's no need to complicate the task, and I prefer to focus on the pleasure of fishing. A short, light rod allows you to have fun with unafraid fish.
The second rod is longer, between 9 and 10 feet for a 4/5 line. I use it mainly in the rivers that flow into the Uyuni salar. These rivers are a little more technical, and you need to be more careful in your approach. A longer rod enables you to better control drifts and therefore offer a cleaner presentation of the fly. What's more, these rivers are often home to native fish (such as mauri or karachi), which are an integral part of the trout's diet. Under certain conditions, fish bite almost exclusively on streamers animated close to the bottom.
Bristles
As a general rule, I use a floating line adapted to the power of the rod. I like DT profiles, which allow a discreet landing. On some larger rivers, where streamer fishing is common, I prefer to use WF profiles, which limit false casts and make it easier to reach the fishing zones.
Bottom line
As the fishing pressure is low, it's not necessary to go down to diameters that are too fine. I prefer to use minimum diameters of 14 or 16/100ths (or even more), which makes for shorter fights.
Flies
I keep my fly-tying simple and prefer to use classic flies. More than the pattern itself, I pay particular attention to the fly's color and swimming depth. On the Bolivian Altiplano, no fly seems more effective than others. However, darker colors (brown, black) are generally more effective, while lighter colors (yellow, beige, etc.) give poorer results and can spook fish. Under certain conditions, such as in the morning or in cold weather, trout remain almost motionless. It is therefore crucial to pass very close to them, using flies of varying densities to reach the desired layer of water.
Technical
In Bolivia, it is possible to practice all fly-fishing techniques. However, certain rivers lend themselves better to certain approaches. For example, streamer fishing is particularly effective in rivers that are home to native fish populations. On these same rivers, fishing with other types of flies is only effective at certain times of the day. Conversely, in rivers where there are no other fish populations, streamers are completely ineffective, while insect imitations can be formidable. Before starting to fish, it's important to observe the river and try to locate the food sources available to the trout. This is the best way to avoid missing out on fishing.
Bolivia's rivers may not offer record-breaking fish. It will be difficult to catch a fish over 50 cm in these biotopes. But there are many moments of frenzy, and catching several dozen fish per trip is quite normal. With a little preparation, more than 100 catches in a day can be envisaged.
