Atlantic salmon are an ecologically and culturally important species in healthy aquatic systems of western Newfoundland. This measure determines the status and trend, over a 10 year period, of Atlantic salmon returning to spawn in three rivers in Gros Morne - Western Brook, Trout River and Deer Arm Brook. Secondarily, it will detect invasive anadromous species. A salmonid counting fence is rotated through the 3 rivers. The fence operates from spring to fall (June to October), and each river is sampled at least once in a five year cycle. The count of large salmon, grilse and Brook trout is obtained.