Several shots from different angles at Rivière Saint-Jean of fisheries researchers catching salmon fries at a counting fence and taking various measurements, tagging. Night underwater shots of salmon in enclosure with man's feet in evidence, of man's hands catching salmon and measuring them underwater, of man opening enclosure door and helping salmon to get out. Shots outside enclosure of door being opened with salmon swimming out of it and away. Daytime shots of same, researchers at counting fence in enclosure with salmon and writing down notes. Underwater shots of river bottom and of salmon swimming. Underwater shots of tagged salmon swimming in a tank.