Initially, the researchers led by oceanographer Patricia Yeager of the University of Georgia was going to just explore the flora and fauna of the mouth of the Amazon. However, one of the team members remembered an old article in the 1970-ies that mention caught in the area of reef fish.

To locate a mysterious reefs was not easy: the authors did not specify the GPS coordinates, and the Jaeger group had to examine the entire coastal zone with the help of sound waves. They then took samples from the sea floor (to ensure availability and to clarify the amount of reef).

It turned out that the reef system is home to various life forms, not visible through the water full of silt the Amazon — dozens of species of reef fish, sponges, sponge-eating fishes, algae and of course the corals themselves.

In 2014, the marine scientists have conducted a re-examination and made a comprehensive catalogue of all the types. It turned out that in the South of the reef system before it comes more sunlight and the ecosystem is dominated by traditional corals and photosynthetic organisms. To the North on the reefs begin to dominate the sponges and other creatures that receive food resources from the river plume.

Scientists say that a giant reef system of the Amazon by the time of its opening was under threat of destruction. On its territory are planning to produce oil. Moreover, warming and increased acidity of the oceans has on corals of the Amazon region no less than in other reefs of the Earth.