The blob is mainly a stillwater pattern, and is successful from Spring through to Autumn for both Rainbow and Brown trout. The blob is often used as an attractor pattern on the top dropper of a team of flies.
These are unweighted patterns tied with fritz type materials for the body. Some patterns have small marabou tails in contrasting colours while others sport a wing of flashabou material. Colours are many and varied but sunburst orange and yellow are firm favourites on the competition scene.
They are generally fished on sinking lines and are usually positioned on the top dropper with either a lure or a nymph or both, fished beneath. Invariably blobs are fast pulling patterns although they do sometimes get taken off the surface while waiting for the other flies to sink.