The city of Murmansk. Sea port. Ships in the water area of the port, at the berths. Unloading ships. The streets of the town. Research Institute of the Fishing Industry. Bottom fish laboratory. Scientist V. I. Travin at work. Scientist NA Maslov, studying fish stocks in the Barents Sea at work. The city of Kaliningrad. Kaliningrad Research Institute of the Fishing Industry. Laboratory of Professor A. N. Probatov. Professor and laboratory staff at work. Fish in alcohol: hammerhead fish, flying fish, sardinella aurita. Moscow city. All-Union Scientific Research Institute of Marine Fisheries and Oceanography "VNIRO". Hydroacoustic laboratory. Laboratory of Piezoelectric Crystals. Researchers A. Shein, E. K. Shishkova, professor G. S. Korzinkin and others at work. Research vessel-submarine "Severyanka" at sea. Scientists-ichthyologists monitor the readings of the instruments. Atlantic Ocean. Fishing fleets in the ocean. Scientists on the base ships of the flotillas, including A. N. Probatov. Fishing and cutting of fish. Landscapes of the ocean. Dolphins. Sea turtle, stingray fish, shark in the pool of the ship.