 When Moura located the fish he caught around the Amazon Reef and in the mouth of the Amazon River, he saw this as an indication that there must be biodiversity underneath, as the fish was indicated to be a coral reef fish.A few decades later a group of students from the University of Georgia noted that Moura's article did not contain GPS coordinates and used Moura's sound waves and sea floor samples to locate the reef.Once they believed they had located the reef they dredged the bottom to confirm that this was its location.