The caddis fly is one of the most common species of aquatic based fly in the world. The two common varieties of larave in the uk are the hydrosyche and the rhyacophila. This is the hydrosyche fishing fly and does a supreme job at catching fish. When fly fishing you want to be using fishing flies great at imitating the food that fish feed on and caddis larave make up a huge proportion of trout or grayling diets through the year. The larave often live in cases that they build from materials they find on the stream or lake bed which they leave when ascending to the surface to hatch.
This is a must have trout and grayling fly and will catch fish through out the year.