around hydropower plants. In this way spawning migration has been enabled again, albeit in a limited way. Angling Sea trout are popular with anglers and as food. The close season lasts at least three months depending on river authority regulations. Like salmon, sea trout are protected by law in the Rhine river system and in most German rivers (except some northern German rivers) all year-round. In the coastal waters of Schleswig-Holstein, sea trout is protected from 1 October to 31 December. This applies only for fish in spawning colour (brown), the silver coloured fish may continue to be caught. In most estuaries angling is completely prohibited in a protected area of 200 metres around the river mouth during this time. In the coastal waters of Mecklenburg-Vorpommern, there is a general prohibition on fishing for sea trout from 15 September to 14 December. This applies both to fishermen and anglers. In Germany, the term Absteiger is used by anglers to describe a sea trout after spawning. The removal of absteigers is a controversial topic among anglers. Most anglers refuse to take sea trout that have spawned because their meat is inferior and dry. In North Wales the rivers Clwyd, Elwy and (to a lesser extent) Aled have runs of migratory trout, otherwise known as sea trout or, locally, sewin . Sewin generally refers to smaller sea trout up to around 30 – 40 cm in length. Fishing (angling) for sea trout is usually carried out at night using fly fishing techniques, but only when the rivers are running clear. Sea trout are very easily "spooked" by bankside disturbance and during daylight hours tend to be tucked up under the banks and submerged tree roots, and therefore very hard to catch. At night they feel more confident to come out into the main river flow and can often be seen "running" (migrating upstream) in the shallow runs during the months of May to November. When the rivers are flowing coloured in a spate following heavy rain, it is possible to catch sea trout during the day with artificial lures or spinners. The fishing season for sea trout in the Clwyd catchment is from March 20 to October 17 inclusive. Many fly fishermen would agree that night fishing for sea trout can be one of the most exciting forms of the sport as the fish can grow to more than 10 lbs (5