The shrimps that are found in northern Europe are of many shapes, colours and sizes ranging from 10-70mm in legnth, and from transparent,  grey brown to olive. Those species that are of interest to the fly fisherman are, the Sand shrimp (Leander adsperus ), Common shrimp (Crangon vulgaris ) Mysis shrimp (Mysis relicta )  and sand hoppers (Gammarus, locusta )  all  these  can be found in great numbers along most of the coast line and in all types of environments from sandy beaches to rock and sea weed beds.  The wandering sea trout doesn't generally go hunting specifically for shrimps but will pick them up and where the opportunity arises, gorge on them. 

Although there are individual patterns that imitate all the above mentioned shrimps, as selective feeding can occur when large numbers of a particular species are located by feeding fish.  This pattern is not designed to imitate any one particular shrimp species, but a characture of them all in general, as a all round pattern. 

When fishing a shrimp pattern my outfit is a floating line and a long fine tapered leader of around three and a half metres, that I normally build up from 1.5 metres 2x, 1 metre 3x and 1 metre 4x, on the point. This will allow a good turn over and clean presentation in the sometimes difficult conditions of wind free flat calm summer evenings. Fishing only the top one metre of water. Your retrieve should be made up of short quick figure of eight jerks, with the occasional long slow pull and pause.  But when making your pause be ready for  savage takes as this is normally when the sea trout attacks. When fishing under the cover of night, shallow water with a sandy bottom is an excellent place to stalk not only sea trout but also cod and flat fish, as shrimps are normally found in great numbers in such places, but the fish won't come in to feed until they are under the safety of darkness. If you observe fish feeding just under the surface creating a bulge ( but not a splashy rise) in the surface, rather like a still water trout feeding on emergers,  the chances are, that they are taking shrimp.  All these naturals have the ability to swim up, down, backwards and slowly forwards, and the inspection of small rock pools can give an excellent opportunity to observe swimming and feeding behaviour of these shrimps in their natural environment. 

This pattern has proved successful in many colours, but three of the most productive are Orange, white and olive.