ISLAMORADA, Fla. -- Fabien Cousteau is entering the second half of his 31-day underwater living experiment in the Florida Keys.

Cousteau and a team of researchers dove June 1 to Aquarius Reef Base to study the coral reef.

Florida International University officials say the data collected by the "Mission 31" team so far shows how significantly the activity of small fish on the reef is affected by large predators, which could change how those species are managed.

The team also is measuring ocean acidification.

Cousteau also has been holding online chats with classrooms worldwide. He was visited last week by actor Ian Somerhalder, marine biologist Sylvia Earle and his father, Jean-Michel Cousteau.

Aquarius allows scientists to live and work underwater and scuba dive without needing to return to the surface or decompress.