This is a movie from Ana Kai Tangata, one of the caves on the coast of Easter Island. This cave was near our house and I visited the cave a few times because you could see fish swimming in the waves. All kinds of fish, green ones, yellow ones (at the time the king was the only one allowed to eat yellow fish), red and blue ones.
Ana Kai Tangata is well known on the island because it is the only cave with paintings on the ceiling of the cave. The paintings should be old and represent all kinds of fish (and some other seacritters like turtles).