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Episode 403: Grouper Moon

Join researchers from the Reef Environmental Education Foundation and the Cayman Islands Department of Environment as they study one of the last great reproductive populations of Nassau Grouper. Normally a solitary species, during the winter full moons Nassau Grouper travel, sometimes over great distances, to "group" together and spawn. While most of the known spawning sites in the Caribbean have been fished out over the years, the west end of Little Cayman in the Cayman Islands is home to the largest known reproductive spawning aggregation of this endangered species.


Meet the experts featured in this episode.

Special Thanks:


Cobalt Coast Dive Resort

P.O. Box 159
18-A Sea Fan Drive
West Bay, Grand Cayman
Cayman Islands, KY1-1401

Image Credits

Changing Seas would like to thank the following individuals and institutions who kindly allowed their footage, images and other media to be used in this production:

Brice Semmens
Huw Evans
Joshua Stewart
Leslie Whaylen Clift
Kirsten Luke McCord
Reef Environmental Education Foundation 

Scott Heppell
Heppell Lab - Oregon State University

Phil Bush
Cayman Islands Department of Environment

Special Thanks:

Gina Matthews
Cayman Islands Dept. of Tourism

Reef Divers
Little Cayman Beach Resort
Cayman Islands

Little Cayman, Cayman Islands
Peter Hillenbrand
Southern Cross Club

Delwin McLaughlin

Keith Neale

Kevin Jackson

Web Extras

How do scientists study fish at the aggregation site?

An excerpt from the Changing Seas: "Grouper Moon" episode.

Grouper Moon Web Chat

The "Grouper Moon Project" is a collaborative conservation program between REEF ( and the Cayman Islands Department of the Environment. Scientists and volunteers study the Nassau Grouper spawning aggregation off the western tip of Little Cayman Island. The project also includes an educational component funded by the Disney Worldwide Conservation Program.

Funding for this episode of Changing Seas was provided by: