Several shots from different angles of two biologists of the "Freshwater Institute" on a lake in motorboat taking different kind of water samples, of them moving on boat to a floating platform in middle of the lake, biologists emptying bag of ammonium chloride in a large can. Cut to them in motorboat on lake, of lake water at rear of boat. TRAVELLING SHOT on white sun behind evergreen trees, of lake waters with sun reflecting in it as boat is moving, of men arriving on lakeshore. Various shots of a scientist in a shed doing tests with specialized equiment. Various exterior shots from different angles of the shed on floaters on lake with rope holding it back to shore. Various shots of a biologist arriving in rowboat at a triangular enclosure and taking samples out of a system of tubes. Various shots of another technician analyst sitting on lake bank with different jars and instruments. Extreme close views of smolts in jars.