The film tells about the appearance of the RAPAN mollusk in the sea and the resulting biological changes in the marine fauna.
Rocks near the Crimean coast, seascape.
Underwater seascape, flora and fauna of the black sea bottom.
A ramp floats by.
The fish buries itself in the sand.
Mussels and oysters on the bottom.
Oyster opens the doors a little.
View of an oyster colony on the sea floor.
Fishing vessel at sea during fishing.
Lifting the dredge out of the water.
Empty valves of oysters on the deck.
The fishermen pour the empty doors on the deck, the captain examines them.
Hands picking through the empty sashes that were fished out.
One of the crew members examines the sash through a magnifying glass.
Oyster leaf under a magnifying glass.
Crew members sort through the fished leaves of dead oysters.
Crew members view a shell found among the catch.
Images of shells on the pages of the Atlas.
Scientists in the laboratory conduct research, determine the shell of a clam-Rapana.
Rapana in a container with water.
Study of the brine in the laboratory.
The premise of the brine in the tank.
Rapana in the aquarium, the face of a scientist conducting research.
Rapana gets out of her shell.
Rapana begins to move along the bottom of the aquarium.
Rapana with a shell on top moves in search of food.
View of the Rapana sucker through the glass.
Rapana moves along the glass wall of the aquarium, sucking on it.
Types of the sea floor.
Empty oyster flaps at the bottom.
Boots of a diver walking on the bottom.
The diver collects the shells with Rapana and empty oyster flaps from the bottom, examines the flaps and throws them.
Oysters are lowered into a laboratory aquarium with Rapana.
Rapana starts moving towards the oysters.
Rapana opens the oyster and starts eating it.
Faces of scientists.
Rapana next to the empty shell of the oyster she had eaten.
Locations: Moscow  Crimea  At Sea 
Seasons: Summer 
Scuba diver goes under the water.
Scuba divers catch RAPAN near oyster colonies, collect RAPAN in nets.
Scuba divers dump out of the nets collected RAPAN on the seashore.
Rapana on the bottom.
Rapana lays cocoons for breeding.
The cocoons full of eggs brine.
Unfolding on the shore of the net to protect oysters from Rapana.
Rapana larvae swim out to sea from a Mature cocoon.
The larvae of the brine increased a binocular microscope.
Fishing boat at anchor.
Fouling on the skin of the underwater part of the ship.
Rapana on the hull of the ship.
Rapana masonry remaining on the hull.
Ship at sea.
Rapana cocoons with Mature larvae.
Map of the appearance of RAPAN in the Black sea in the period from 1947 to 1960 (animation).
Image of Rapana.
Panorama of the black sea beach (top), vacationers on the beach.
Trade in RAPAN shells at the souvenir kiosk.
Rapana shell in the girl's hand.
Scientific publications on the problem of Rapana.
Panorama of the Crimean coast, seascape.
Types of the sea floor, flora and fauna.
Types of Rapana shells before and after mutation.
Sick Rapana at the bottom.
Damaged shell of a sick Rapana.
Empty Rapana shells at the bottom, a crab crawls past.
Hermit crab extracts Rapana from the shell.
The fish swims around a Rapana shell captured by a hermit crab.
Hermit crab moves along the bottom with a Rapana shell.
Mud-covered doors of dead oysters.
Panorama of the oyster pond under construction on the seashore.
Rapana on the sea floor.
View of the sea floor.
Rapana in the aquarium.
Locations: Moscow  Crimea  At Sea 
Seasons: Summer