Several shots from different angles of fisheries researchers unrolling a net across a stream, putting rocks on bottom of it and holding it up with sticks, of men using electric instruments to locate salmon fries and hand net to catch them, of researchers measuring fries and taking sample scales, of men taking net out of stream. More shots of men using electric instrument to locate fishes. Several shots from different angles of a dam in a stream, strong current. MCS at fish sanctuary of French sign: "Sanctuaire, Pêche interdite" with ZOOM OUT MSs on dam and visitors. HAMS of water flowing down waterfalls with salmon from time to time trying to jump against current. MC backview shots of visitors inside barrage building watching salmon swimming and fighting against current through an underwater window including MSs, CSs of salmon.